Offset Reference Ranges - "Will it Fit?"

[SpeedRacerX]

I scoured both Boards and analyzed dozens of threads and hundreds of posts to compile a list of wheel offsets based on rim width that seem to be working for people. Looking for larger and/or wider wheels & tires myself, I know how challenging this can be.

I was able to find 30-40 posts that mention complete wheel & tire measurements and had photos. I did not include anything where the pictures looked like the tires sat at or outside of the fenders. I eliminated almost every mention of fitments that rub, except where I note it.

Now, when I look for wheels, depending on the rim width I'm looking at, I can see if the offset I'm looking at falls into a generally accepted range that has been proven by other members.

Hopefully others will find this useful. All offsets are +

Front Wheels

8" 35-48 Stock is +48 (18" & 19")
8.5" 30-45 Majority are running 35-40.
9" 38-51 Majority are running 38.
9.5" 34-40

Front Tires

Stock is 245/45-18 or 245/40-19 Front and Rear.
245 & 255 are most common. Even 265. Now 275. Some have tried 285.
45-18 and 40-19 are common.
245/40-19
255/35-19
265/35-19
245/35-20
255/35-20
275/35-19 on 19x9.5 w/+40 offset or +45 w/5mm spacer

Rear Wheels

8" 48 Stock is +48 (18" & 19")
8.5" 42
9.5" 35-57 Majority are 42-45
10" 40-55 Majority are 45, also 20x10 +60 with a 295/30-20 tucked and did not rub!
10.5" 46-47 50 seen now too.
11" 54

Rear Tires

275 & 285 are most common; up to 305 on lowered vehicle which required cutting & rolling.
40-18 and 35-19 are common.
275/35-19
285/35-19
305/30-19 (cutting & rolling)
285/30-20
245/35-20
295/30-20 (tested only on 20x10 +60 so far - no cutting or rolling and it tucked)

If anyone has any additional known fitments that do not cause rubbing issues OR if anyone sees any mistakes in here, please let me know and I'll add/change/delete to this list.

Warning: I can't guarantee these fitments - they are only as good as the person who posted the result and my interpretation of the pictures...

Approx. Measurements which might be helpful when looking at larger rear wheels & tires:

- Inner Wheel Well Wall to Wheel Mounting Surface = 8.715"
- Shock Bump-Out to Wheel Mounting Surface = 8.215"
- Inner Wheel Well Wall to OS Edge Fender = 12.75" = 324mm
- Shock Bump-Out to OS Edge Fender = 12.244" = 311mm
- Inner Wheel Well Wall to OS Edge Fender Minus a .125" Rolled-up Flat Lip = 12.625"
- Shock Bump-Out to Rolled-up Flat Lip = 12.125"
- Shock Bump-Out Plus extra .125" Clearance to Rolled-up Flat Lip = 12.000"
- Inner Wheel Well Wall to IS Edge of Non-Rolled Lip = 11.875"
- Shock Bump-Out to IS Edge of Non-Rolled Lip = 11.375"
- Shock Bump-Out Plus extra .125" Clearance to IS Edge of Non-Rolled Lip = 11.25"

[KEV-O]

i'm running on 245/35/20 all the way around
wheels are 8.5" all the way around also
i believe my offsets are 42

[Kermit]

GRRRR8 info Speed. Thanks for the leg work. This will sure help me once I start looking at getting different wheels.

[SpeedRacerX]

i'm running on 245/35/20 all the way around
wheels are 8.5" all the way around also
i believe my offsets are 42

Excellent. My first validation. Fits the width/offset range & known tire fitments above :woohoo:

[KEV-O]

:)

[SpeedRacerX]

:)

Added your 8.5" +42 to the rear. Thanks!

[KEV-O]

don't forget the rear tires
245/35/20

[jdeserio]

thanks for the list...

[SRG963]

Excellent Thread!

Stock GT Wheels:
19"x8" +48mm Offset



Also, please load up the car with passengers to test rubbing issues.

[swatt444]

I'm running:

20x8.5 +40 with 255/35 - 20 Front

20x9.5 +40 with 275/35 - 20 Rear

Based on my results, your values are right on.

Thanks for the excellent post, this will save people a lot of time.

[jimmytt6]

Good info Speed...thx

[SpeedRacerX]

I'm running:

20x8.5 +40 with 255/35 - 20 Front

20x9.5 +40 with 275/35 - 20 Rear

Based on my results, your values are right on.

Thanks for the excellent post, this will save people a lot of time.

Should be no rubbing in the rear. If you tell me that's the case, I'll add it to the rear list above...

[SRG963]

This thread needs to be stuck IMO.

[ashaal]

+1

[99-LS1-SS]

It's officially been "stuck".

[KaiserM715]

Awesome post!! Thanks for the legwork.

[Kermit]

This is some GRRRR8 info. Any chance on adding what the stock rims and tires (both 18 and 19 inches) are to use as a reference?
This is helping me get one step closer to figuring out what I would like to get.

[SpeedRacerX]

This is some GRRRR8 info. Any chance on adding what the stock rims and tires (both 18 and 19 inches) are to use as a reference?
This is helping me get one step closer to figuring out what I would like to get.

Done.

[Kermit]

Sweet!:clap: Thanks!!:theman:

[Kermit]

Speed,
I'm lowered to 605mm and was wondering what I may be able to handle without rolling the fenders. Are the above offset's doable except where noted with cutting and rolling?
I’d like to get as fat as I can without hitting anything. Any idea what the max was for the inside of the wheel to the strut housing? Maybe I'll have to get up in the wheel well and see if I will be able to measure that distance.

[SpeedRacerX]

Speed,
I'm lowered to 605mm and was wondering what I may be able to handle without rolling the fenders. Are the above offset's doable except where noted with cutting and rolling?
I’d like to get as fat as I can without hitting anything. Any idea what the max was for the inside of the wheel to the strut housing? Maybe I'll have to get up in the wheel well and see if I will be able to measure that distance.

OK. Let me try to answer this in parts. In some cases, I'm not sure if you are asking about the front or back so I'll give you both from what I know or measured.

On my vaca, back in July, I got in the fender wells as best as I could with a tape measure and yard stick to see "what we're playin' with."

On the front, where you have the coilover struts, you'd be lucky if you could add 1/2" to the inside of the tire width before rubbing the strut assembly. It's tight. Max tire width (assuming non-lowered AND stock offset) you get in there is a 255. Anything wider in tire width or rim width, you will want to push the tire outward toward the fender - in other words - lessen the positive offset from like +48 to +40 or +38. For example, the Intense front's of 265 wide tires on 9.5" wide rims were pushed outward with a +34 offset.

Especially on a lowered car, you really don't want to Increase the overall diameter of your wheel/tire setup. This will just compound possible problems with fender lips or over bumps with weight, etc.

On the rear, you have more to play with. From the inside fender well to the inside edge (tucked) of the fender lip, you have about 11.75 of width space (298mm). The fender lip itself adds about another .875" of metal width before you then reach the exterior edge of the fender lip (320mm total). I have done a ton of research on just how wide you can go in the back and it looks like (with the right offset), you can easily get a 275 in there, 285 should be no issue too, and I personally believe I may try to put a 295 in there on mine. It's going to be tight without modifications and I'm not lowered yet. NOTE: this is not tucked! Will explain below.

There are two main and related things to watch out for in the rear. The first is that there seems to be what I'll call a "Questionable Area" of about .500-.625" on the inside of the fender well. I would avoid this area and get no closer to this area unless you want to cut and modify like the Intense car did. That area is where the fender well bump out is for the rear shock and where that brake line connector is that Intense modified. Without modifying this area, you have to choose rim widths and offsets carefully to stay away from being that close or you will hit it or rub it.

The second thing to watch out for is the lip itself. Up until recently, I thought people with wide rear tires were rolling their fender lips so they could get their tires to "tuck" into the fender, not stick under or outside of the lip, and to not rub the inside edge of the fender lip. What I found out is that while that might be true in some cases, people with wide tires are allowing the rear tire outside edge to sit under the fender lip and therefore some people are rolling so that if they are lowered or a ton of weight is placed in the car the lip won't squat down on to the tire. Note: the curved shape of the outside edge of the tire and the rolled-upwards edge of the lip helps in this regard. In other words, if corners were square and sharp, you'd have bigger problems - people would be cutting fenders.

What I figured out on mine is that I will let the wide rear tire exist under the lip (but not outside of the fender like a matchbox car) because with a stock height tire, not lowered, and the tightness of the rear suspension, that fender lip is not going to come down and hit my tire unless I was doing something drastic like flying over a speedbump with three people in the back.

Now, correct me if I'm wrong but at 605mm, isn't the stock height about 660mm (I can't remember for sure) which means that you are lowered about 2"!!! If that's the case, I think anything that resides under the fender lip will rub without rolling. So if your question is what safely can fit in the rear to clear the "questionable zone" on the inside and tuck within the fender lip even though you are lowered....would be a 275 with a tough to find +57/58 offset. I have seen a couple of 9.5" wide rims with 56 & 57 offsets but I doubt I could find them again easily. What I can't tell you because I haven't looked closely yet is this: OK, so the 275s seem to be able to tuck with the right offset...But...with you lowered, what's up inside that fender well in the top that the tire might hit when weight comes pounding down on the back end of the car? I'm not sure. Then again, your lowered suspension might also be tighter and not have much travel, which would help in this case.

Again, please triple verify all my measurements. I don't want to be responsible for you buying tires that rub. :hang:

Hope that helps.

[Kermit]

Wow, much more than I was hoping for so thanks for the indepth answers.:)



On the front, where you have the coilover struts, you'd be lucky if you could add 1/2" to the inside of the tire width before rubbing the strut assembly. It's tight. Max tire width (assuming non-lowered AND stock offset) you get in there is a 255. Anything wider in tire width or rim width, you will want to push the tire outward toward the fender - in other words - lessen the positive offset from like +48 to +40 or +38. For example, the Intense front's of 265 wide tires on 9.5" wide rims were pushed outward with a +34 offset.
I'm looking at these Forgestar's F05 real hard here and my options are 19x8.5 offsets from +32 to +47, 19x9.0 offsets from +26 to +50, & 19x10 offsets from +26 to +45.
According to the Intense car, I should be able to get away with the 19x9.0 with a +34 offset up front. That would push me 2mm closer to the strut on the inside and 24mm out.

On the rear, you have more to play with. From the inside fender well to the inside edge (tucked) of the fender lip, you have about 11.75 of width space (298mm). The fender lip itself adds about another .875" of metal width before you then reach the exterior edge of the fender lip (320mm total). I have done a ton of research on just how wide you can go in the back and it looks like (with the right offset), you can easily get a 275 in there, 285 should be no issue too, and I personally believe I may try to put a 295 in there on mine.
What rim would a 285 tire sit on? Would the 19x10 work? I might try to go bigger in the back (is that what they call staggered?) but not sure because I do like having the ability of rotating my tires for longer life. I guess I could always just rotate from left to right if I really wanted to. :wacko:

I don't want to play with the "Questionable Area" at all so I'm going to just stick with what is safe that others have done.

What I figured out on mine is that I will let the wide rear tire exist under the lip (but not outside of the fender like a matchbox car) because with a stock height tire, not lowered, and the tightness of the rear suspension, that fender lip is not going to come down and hit my tire unless I was doing something drastic like flying over a speedbump with three people in the back.
Are you planing on rolling the fender sense you will eventually lower your car?


Now, correct me if I'm wrong but at 605mm, isn't the stock height about 660mm (I can't remember for sure) which means that you are lowered about 2"!!!
You are correct, the stock is at about 660mm.


If that's the case, I think anything that resides under the fender lip will rub without rolling. So if your question is what safely can fit in the rear to clear the "questionable zone" on the inside and tuck within the fender lip even though you are lowered....would be a 275 with a tough to find +57/58 offset. I have seen a couple of 9.5" wide rims with 56 & 57 offsets but I doubt I could find them again easily. What I can't tell you because I haven't looked closely yet is this: OK, so the 275s seem to be able to tuck with the right offset...But...with you lowered, what's up inside that fender well in the top that the tire might hit when weight comes pounding down on the back end of the car? I'm not sure. Then again, your lowered suspension might also be tighter and not have much travel, which would help in this case.
With me being lowered already your saying my best bet is to get the fenders rolled? Bummer.

Again, please triple verify all my measurements. I don't want to be responsible for you buying tires that rub. :hang:
Don't worry, you have helped a lot. Just trying to see what I might try to get in the future. Sure wish we knew for sure what the max ranges were for stock and lowered cars. :)

[xruling]

Spectacular work. Thank you for sharing your research. BIG time saver for me.

[r33pwrd]

[QUOTE=SpeedRacerX;173478]IRear Wheels

8" 48 Stock is +48 (18" & 19")
8.5" 42
9.5" 35-57 Majority are 42-45
10" 40-55 Majority are 45
10.5" 46-47 50 seen now too.
11" 54

QUOTE]

So does anyone have a 10" wheel with a 40-42mm offset they can send me a picture of? I am worried the wheels would stick to far out in the rear.

I know they "will fit" but like I said I am really picky on the look :)

[SRG963]

I know they "will fit" but like I said I am really picky on the look :)

IMO they will rub, you should be looking at +54 range

Just read today that the stock 20X9.5 rears are +56

[r33pwrd]

IMO they will rub, you should be looking at +54 range

Just read today that the stock 20X9.5 rears are +56

I agree thats why I asked... but if im reading above correct people are saying you can run a 40?

[SRG963]

I agree thats why I asked... but if im reading above correct people are saying you can run a 40?

You could run it but it will rub when lowered or loaded up.

[SpeedRacerX]

I think that's why the "majority" are +45 or higher.

Remember, some want to "tuck" and others don't mind if the tire sits under the lip and run the risk of rubbing under load or when lowered.

It was a ton of work to put this together; now I wish I had saved each picture to go with what I found. :facepalm2:

Maybe the next time I can't sleep I'll try to find the posts with a 10" wide rear with the 40-42 offsets....I can pretty much guarantee you that the edge of that tire sits right at or near the edge of the fender but not outside of it.

[SpeedRacerX]

[QUOTE=SpeedRacerX;173478]IRear Wheels

8" 48 Stock is +48 (18" & 19")
8.5" 42
9.5" 35-57 Majority are 42-45
10" 40-55 Majority are 45
10.5" 46-47 50 seen now too.
11" 54

QUOTE]

So does anyone have a 10" wheel with a 40-42mm offset they can send me a picture of? I am worried the wheels would stick to far out in the rear.

I know they "will fit" but like I said I am really picky on the look :)

OK, so I spent the last 90 minutes looking through the threads and found a good example of a 20x10" rear wheel with a +40 offset. Thread is on the other forum but you can go to wheeldude.com, search by wheel brand, Linea Corse, Z20, First one in Dark Gunmetal has a 10" rear +40. Click on that and you'll see pictures of the white G8 with these wheels. "cobrakiller" is the car owner.

I'll see if I can find any others.

[r33pwrd]

[QUOTE=r33pwrd;200913]

OK, so I spent the last 90 minutes looking through the threads and found a good example of a 20x10" rear wheel with a +40 offset. Thread is on the other forum but you can go to wheeldude.com, search by wheel brand, Linea Corse, Z20, First one in Dark Gunmetal has a 10" rear +40. Click on that and you'll see pictures of the white G8 with these wheels. "cobrakiller" is the car owner.

I'll see if I can find any others.


That does not look bad to me at all! The wheel I was / am thinking about is a 43mm plus If its an issue Im sure I can have another 2-4mm machines off the backplate :)

Thanks for you help man!

[r33pwrd]

I found this as a very cool tool as well! It allwya you to compair 2 wheels / offsets

http://www.1010tires.com/WheelOffsetCalculator.asp

[SpeedRacerX]

Very cool. I like the "clearance" calculations.
I have also used the size comparer on rims-n-tires.com quite a bit.

[MLR]

I think my wheel size is already on the cart but I will add these pics. 19" bbs CH 8.5" 35mm front and 9.5" 40mm rear. Tires need to replaced with the right size side wall is kinda small but they came with the wheels, 235/35/19 front and 265/30/19 rears.

[mi04se1]

Those look tiny.

[cdb09g8gt]

Except for MLR's pics (Thanks!): :TTIWWP:
If you've got bitchin' wheels and know the offset,
give us some pics for us who want to see how your offsets look with the fender lips!:thumbsup:

SpeedRacerX, thanks for the info

[r33pwrd]

Those look tiny.

I think those are actually "big" looking 19's... tire look to be low profile though :)

[cmross13]

ugh, thank god i found this lol

[BlueJacket]

Can someone verify that this set up will work without rubbing and that the tire size is what I would want to use.

Front 20x8 35mm offset with a 245/35/20
Rear 20x9 40mm offset with a 275/30/20

[SpeedRacerX]

Added the 295/30-20 on 20x10 +60 Rear. Thank you "mtolivecracker"

[Virus]

Can I do 285/30 on 20x9's with 40mm on rear and a 275 or 285/30 on the front with the same rim?

[SRG963]

Can I do 285/30 on 20x9's with 40mm on rear and a 275 or 285/30 on the front with the same rim?

Comparing to my setup (rears only), your +10mm out further with 1/2" less width (roughly 12.7mm or 6.35mm less from each side), so with the same tire, your only 3-4mm out further than I am. I think 275's would work perfectly on all of your wheels IMO.

[Virus]

Comparing to my setup (rears only), your +10mm out further with 1/2" less width (roughly 12.7mm or 6.35mm less from each side), so with the same tire, your only 3-4mm out further than I am. I think 275's would work perfectly on all of your wheels IMO.

Another concern is I'm not lowered so the gap may look pretty bad.

[SRG963]

Another concern is I'm not lowered so the gap may look pretty bad.

I'm not lowered either, gap isn't too bad IMO.

http://i879.photobucket.com/albums/ab359/SRGSRG963/Castle%20Pics/112_0351.jpg
http://i879.photobucket.com/albums/ab359/SRGSRG963/Castle%20Pics/112_0334.jpg
http://i879.photobucket.com/albums/ab359/SRGSRG963/Castle%20Pics/112_0345.jpg

[Virus]

What sizes fronts and backs are on your car?

[dmg]

22x8.5 +40 with 245/30 - 22inch Front

22x8.5 +40 with 245/30 - 22inch Rear on VE Holden Ute / G8 Sports Truck or whatever the name is going to be,
i have had no dramas with them hitting / rubbin etc....and they ride as smooth as my 20 inch rims that were on before

http://forum.grrrr8.net/attachment.php?attachmentid=8880

[SRG963]

What sizes fronts and backs are on your car?

Me (with the late response)?

245/40/19 / 285/35/19

[jeff]

Anybody using the 295/30/20 out back? If so pics would be awesome!!If so, is the susp. stock?Your offset +60?Any issues?Are you doing alright without fender roll?Pic of the rims too would be sweet.Asking alot here,but I am wanting to go with aftermarket rims now and as much meat out back as possible would be sweet.Thanks!!

[jeff]

Anybody?

[SpeedRacerX]

Anybody using the 295/30/20 out back? If so pics would be awesome!!If so, is the susp. stock?Your offset +60?Any issues?Are you doing alright without fender roll?Pic of the rims too would be sweet.Asking alot here,but I am wanting to go with aftermarket rims now and as much meat out back as possible would be sweet.Thanks!!

Yup, here you go. He's running a 295/30/20 out back, +60 offset, and he's lowered. Should be pix there too. http://forum.grrrr8.net/showthread.php?t=17834&page=1&highlight=widened+camaro

[GTX]

I am looking at the Beyern Mess 18x9.5+45 or 19*9.5+40. I really want to run 265 up front and 275 out back. It would be nice to have the 3" lip all the way around, but would the 18x9.5 or 19x9.5 rim be too big with a 265 up front? Or what off set would I need.

I see a lot of posts for the rear set up. I think I would be good with either 18x9.5+45 or 19x9.5+40.

http://www.discounttire.com/dtcs/wheels/beyern/size/viewProductDetail.do?pc=57545

[SRG963]

I think I would be good with either 18x9.5+45 or 19x9.5+40.

http://www.discounttire.com/dtcs/wheels/beyern/size/viewProductDetail.do?pc=57545

Do you plan on lowering the car at all?

[Atlas]

So I have no clue what I am looking at in this thread and I have a question: I may be getting a set of 17x9.5 with 54mm offset, and while I can deduce that they will fit in the rear, will they fit in the front??

[vx-355]

Maybe I posted in wrong section??

Sorry if I did :(

http://forum.grrrr8.net/showthread.php?t=22097&p=328934&viewfull=1#post328934


Hi Guys,

Here is a pic of my car. For those that don't know its the Holden SSV SportsWagon, more info can be seen here http://forum.grrrr8.net/showthread.php?t=17936&page=1
http://i298.photobucket.com/albums/mm249/VX-355/Cars/SSV-05B/IMG_0630.jpg

I'm looking at some new rims very soon....I currently have 22 x 8.5" all round with a +45 offset and run a 245 30 22 tyre.

One set I am looking at:
Front: 22 x 9" (+40 offset) and would probably be 255 30 22 tyre
Rear: 22 x 10" (+50 offset) and would hopefully be 275 30 22 or 285 30 22 tyre.

Thing is I want to upgrade the Holden Front brakes to GXP/Camaro Brembo's or the HSV Brakes and not too sure on offset to clear.
Also, the car has sits sort of low and am not too sure on scrubbing. The way it is with current tyre/rim size I get occassional rubbing on the plastic inner wheel arches but no scrubbing on the metal as the rear guards have been rolled very well.

Any thoughts or info would be appreciated.

[laserred]

Damn I wish we had the wagons here in the states. Dodge Magnum SRT what? That thing can have all the Hemi it wants, you can't mess with the LS3!

Damn nice car, VX. Got any more pics? You might make my wallpaper!


Will a 20x10 +37 fit on the rear? I also am looking at a 20x8.5 +35 and just wanted to know. I know this is a little outside the so-far-successful range listed on P1, but 37 is all they got. I'd probably put a 285 on it.

[Slizzo]

Damn I wish we had the wagons here in the states. Dodge Magnum SRT what? That thing can have all the Hemi it wants, you can't mess with the LS3!

Damn nice car, VX. Got any more pics? You might make my wallpaper!


Will a 20x10 +37 fit on the rear? I also am looking at a 20x8.5 +35 and just wanted to know. I know this is a little outside the so-far-successful range listed on P1, but 37 is all they got. I'd probably put a 285 on it.

Won't fit without major modification to the wheel wells. +45mm is about as low as you can go, and that would require modification as well.

[youngrushhour]

Could I do these:

http://www.slickcar.com/productdetails.asp?ProductID=605

(Offset is either 38 or 56 -- which would work?)

Or these:

http://www.oewheelsllc.com/Wheels-for-Camaro/By-Finish/Black/17-Fits-Camaro-C6-Z06-p6902195-2-1.html

(Ofsset is 54)

with 295x17 DRs (27.5" tall)?

Car is riding on the Pedders OE height springs, which means it is slightly lowered.

[SpeedRacerX]

Could I do these:

http://www.slickcar.com/productdetails.asp?ProductID=605

(Offset is either 38 or 56 -- which would work?)

Or these:

http://www.oewheelsllc.com/Wheels-for-Camaro/By-Finish/Black/17-Fits-Camaro-C6-Z06-p6902195-2-1.html

(Ofsset is 54)

with 295x17 DRs (27.5" tall)?

Car is riding on the Pedders OE height springs, which means it is slightly lowered.

No 38 offset for the rear; the other options are fine: +56 or +54. Does a 295 DR measure like a 295 street tire width-wise? Mtolivecracker tucked a 295 street tire on Eibachs lowered with a +60 offset and he was maxed out, pretty much, if I recall with remaining clearance. If it measures about like a 295 street tire, those offsets should be great especially since you are only slightly lowered UNLESS they are really tall compared to stock. They are taller by .4" up top so you MIGHT get a little outer side rub when you launch hard......for this reason, +56 would be better than +54.

[youngrushhour]

Sounds good. Thanks a lot, man. I guess I'll be giving this a try, then.

The tire should be roughly the same width as a street tire. I would think that they would be fine at the track since I'd obviously be running them low and there aren't any bumps ;)

[Atlas]

Does anyone know if the GTO 17's will fit all the way round?

[KRacer1025]

I have been looking at a 20x8.5 with a +35 offset front and rear. Tires will be 245/35R20. I dont think I will be lowering the car, but I have a large speaker box that is rather heavy in the rear. Will this be a safe tire wheel combo that wont rub.

[SpeedRacerX]

I have been looking at a 20x8.5 with a +35 offset front and rear. Tires will be 245/35R20. I dont think I will be lowering the car, but I have a large speaker box that is rather heavy in the rear. Will this be a safe tire wheel combo that wont rub.

You are fine all the way around. You'll have a safe setup pushed to the edges to create a "wide track" look but you will not rub, you'll be fine. Front leaves more room than mine and I wished mine were outward even further so you're good there. Your rear wheel is pushed outward by 10mm compared to mine but your tire is 40mm narrower so you'll be fine. You shouldn't rub even under load.

[Atlas]

no one knows if the GTO 17 inch stockers will work on the front wheels??

[KRacer1025]

You are fine all the way around. You'll have a safe setup pushed to the edges to create a "wide track" look but you will not rub, you'll be fine. Front leaves more room than mine and I wished mine were outward even further so you're good there. Your rear wheel is pushed outward by 10mm compared to mine by your tire is 40mm narrower so you'll be fine. You shouldn't rub even under load.

Thanks for the reply. Do you think I would be safe going to a 255/35R20 in the rear or do you thing my best bet with this wheel setup the 245/35R20.

[SpeedRacerX]

Thanks for the reply. Do you think I would be safe going to a 255/35R20 in the rear or do you thing my best bet with this wheel setup the 245/35R20.

The extra width is nice but so is having all 4 same size tires and being to rotate them easily. A 255 fits a 8.5" rim better than a 245 but the 255 is also .3" taller (27") than stock (26.7"). Lots of pros and cons. Pretty sure you could do the 255 all the way around - on our heavy car with 20" rim, that slightly extra sidewall can't hurt.

[HuskerG8]

I currently run the stock 19" wheels and have a "No Drop" Pedders track II setup. I have been used the stock 19s and stock tires for HPDEs that past two years. This year I would like to get some NT01 on 18" rims. I would like to get the tires as wide as possible while keeping all four of them the same size.

I have a chance to pick up 18x9.5 with 35mm offset with 275/35/18 for a good price. The shop has test fit them and needed either a 3mm or 5mm space for the front. I have read through this entire thread and others on here, but can't find someone who has gone to 18's with a 265 or 275 tire. Should these work?

My other question would be the tire size. This 275/35/18 is smaller than my stock 245/40/19 by just over 4%. What kind of issues could that cause other than speedo differences? Some of calculators warn that it could cause brake issues.

[Slizzo]

I currently run the stock 19" wheels and have a "No Drop" Pedders track II setup. I have been used the stock 19s and stock tires for HPDEs that past two years. This year I would like to get some NT01 on 18" rims. I would like to get the tires as wide as possible while keeping all four of them the same size.

I have a chance to pick up 18x9.5 with 35mm offset with 275/35/18 for a good price. The shop has test fit them and needed either a 3mm or 5mm space for the front. I have read through this entire thread and others on here, but can't find someone who has gone to 18's with a 265 or 275 tire. Should these work?

My other question would be the tire size. This 275/35/18 is smaller than my stock 245/40/19 by just over 4%. What kind of issues could that cause other than speedo differences? Some of calculators warn that it could cause brake issues.

Could make ABS go haywire if your under hard braking or doing panic stops. 275/40/18 should fit OK no?

[HuskerG8]

They didn't have any of those to try. I was thinking those would be a better choice, just not sure they would fit.

[laserred]

Anybody think I can get a 19x12 +59 on my car?

[SpeedRacerX]

Anybody think I can get a 19x12 +59 on my car?

With what size tire? 325 or 305? You have no idea how many evening hours I've spent and measurements I've taken to try and work out running a 275 on the front (that's easy) and a 325/30-19 on the rear with a 19x11, 11.5, or 12" rim.

There's a lot to comment on with this; let me know what size tire you are thinking first. I have fresh and VERY accurate measurements from just a few days ago.

19x12 +59? You must be looking at Vette or Vette replica rims.

Compared to Vettes and Camaros, I am disappointed with the wheel well space on our cars.

[SLA]

With what size tire? 325 or 305? You have no idea how many evening hours I've spent and measurements I've taken to try and work out running a 275 on the front (that's easy) and a 325/30-19 on the rear with a 19x11, 11.5, or 12" rim.

There's a lot to comment on with this; let me know what size tire you are thinking first. I have fresh and VERY accurate measurements from just a few days ago.

19x12 +59? You must be looking at Vette or Vette replica rims.

Compared to Vettes and Camaros, I am disappointed with the wheel well space on our cars.

Same here, I've spent the last week looking at wheels for my up coming tax return, and happened over to the camaro5 forum, and saw they can fit ridiculous sizes and offsets without any modification.

[SpeedRacerX]

Same here, I've spent the last week looking at wheels for my up coming tax return, and happened over to the camaro5 forum, and saw they can fit ridiculous sizes and offsets without any modification.

I can't believe how TALL the Camaro tires are, almost 28" in many cases.

[laserred]

OEM Grand Sport rims. Don't know what tire size, prolly 305.

[SpeedRacerX]

Anybody think I can get a 19x12 +59 on my car?


OEM Grand Sport rims. Don't know what tire size, prolly 305.

First for some sizes: A 305's section width of 12.3" is measured on an 11" rim. Typical recommended range is 10.5" to 11.5". A 305 on a 12" rim will stretch the section width to 12.7".

Here is where a 305 on a 12" rim ends up based on touching certain problem areas and then your +59 offset.

At a +48 offset, the tire hits the shock bump-out and sticks out of the wheel well by 5/16". The rim itself is ok on the inside and is right at the outside edge of the fender.
At a +60 offset, the tire hits the interior wheel well wall and sits within the fender flare by .125". Rim on the outside is fine, rim on inside "might" touch the LCA.
At a +59 offset, the tire is off the interior wheel well wall by 1mm and still sits within the fender flare by .083" (not much). Rim: 1mm further away from the LCA; rim outside is fine.
So for the +59 to work in this case: cut away the shock bump out; flip over the brake line bracket; remove most of the inner wheel well lining and the front & rear interior lower wheel well lining; pray it doesn't hit the LCA and trim it if it does/if you can; roll the fender lip as flat-up as you can; and trim the bumper bracket as much as you can. A proper ratio 305 should be shorter than stock so you'll get some clearance help there and the 305 stretched on a 12" rim will buy you some extra clearance up top also near the rolled fender lip.

If you spaced it outward at all like 4mm to add some safety margin to the inside, it would sit outside the fender flare and you'd either leave it like that or have the fenders slightly pulled (risky).


For reference, a 325 on a 19x12 hits the interior wheel well wall at a +56 offset and sits outside the fender flare by 1/4". Would require lots of work to fit.

For a 305 to work, you have limited options:
- Custom made rims (CCW, Forgestar, etc) in an 11" width and offsets in the +54 to +62 range plus some inside and outside work.
- You can widen a CTS-V Sedan 9.5" rim to 10.5" and then run a 1/2" adapter.
- TSW makes Nurburgrings in a 10.5" +65 that would work with a small spacer of 1/4" to 3/8".
- A 10" wide ZR1 replica wheel has a +56 offset which would be perfect but 10" is really the smallest you should go for a 305 so it'll work but not look as wide as it should.
- The 12" option +59 offset you mentioned.
- A 11" wide Z06 replica wheel has a +64 offset which should work with a 1/4" to 3/8" spacer/adapter.
- If you come up with other options, please let me know.

Hope that helps...

[SpeedRacerX]

Updated First Post to add approximate rear wheel well dimensions some people might find helpful AND front 275 & 9.5" tire/wheel fitment.

[jonnynadeau]

So in theory, if a 20x10 +60 (295/30/20) would fit in the rear, then a 20x10 +45 (285/30/20) should also fit without an issue right?? I'm at stock ride height and stock suspension.

[TurboMike]

Thats not how it works. If you decrease tire width by 10mm (5mm on each side) and move the offset by 15mm, you've got a tire 10mm closer to something. (Actually a 295 and 285 are not 10mm different, but close enough)

[G8GTKID]

275/30YR20 will they fit on rear?

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[Slizzo]

275/30YR20 will they fit on rear?

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Perfect size for rears.

[G8GTKID]

Perfect size for rears.

No rolling or cutting?

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[BORN2FLY]

No rolling or cutting?

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I'm running Falken 452 tires 285/30/20 on a 20x10 +45mm offset wheel without any issues at stock height..... but I had already rolled my lips because I was using a 285/40/18 NT05R drag radial from the start.

[Slizzo]

No rolling or cutting?

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Depending on offsets, you should be ok.


Posted by iPhone4 via Tapatalk

[G8GTKID]

Depending on offsets, you should be ok.


Posted by iPhone4 via Tapatalk

Cool thanks slizzo!

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[1sweetG8]

Hello, I have been trying to wrap my head around how offsets work and I still don't understand it as well as I need to but I guess I was wondering if you guys could help me know if 19x8 with a 35mm offset would fit without any issues? . I'm not looking to go wider in the rear, just planning on keeping it the same all the way around. I know the stock 19" rims have a 48mm offset. Any input would be appreciated.

[G8GTKID]

Hello, I have been trying to wrap my head around how offsets work and I still don't understand it as well as I need to but I guess I was wondering if you guys could help me know if 19x8 with a 35mm offset would fit without any issues? . I'm not looking to go wider in the rear, just planning on keeping it the same all the way around. I know the stock 19" rims have a 48mm offset. Any input would be appreciated.
Should be fine... I have 20x8.5 on front and 20x9.5 on rear with a 42 offset on rear with no problem


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[1sweetG8]

Thanks for the reply G8GTKID! now I can rest easy

[G8GTKID]

Thanks for the reply G8GTKID! now I can rest easy
:thumbsup:


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[97darkknight]

I'm running Falken 452 tires 285/30/20 on a 20x10 +45mm offset wheel without any issues at stock height..... but I had already rolled my lips because I was using a 285/40/18 NT05R drag radial from the start.

If you lowered the rear 0.8 (eibach rear spring) would you be able to run your 285/40/18 drag radial setup still? Also, what offset was that 18 inch rim?

[Slizzo]

Alright Speed, I have some specs for ya.

20x9.5" +40mm offset all around

Front 275/30/20
Rear 285/30/20, rub with weight in the rear seats and trunk on occasional bumps (stock rims/tires, 2 in back seat, 2 in trunk)

[mdg8gxp]

I have 19x8.5" +35 fronts and 19x10" +44 rear wheels - planning 245/40/ZR19 fronts with 285/35/ZR19 rear tires, and using Xa coilovers so it will be lowered. I'm sure I will have to roll the rear fenders, but will I need to cut them?

[GTX]

Anybody try camaro OEM replicas? They list 20X9 with 40 offset all the way around. I'd like to have 275's mounted on all fours. Should that work?

[Dagoon]

hey everyone. im in the process of buying new tires and heres my current list:

Front:
245/40/19s (stock size)

Rear:
275/35/19 OR
285/35/19

Does that sound good? or what should I tweek here? I want to have no ABS issues and my car is stock height. Should the rears be a 30 instead of a 35?

[SpeedRacerX]

hey everyone. im in the process of buying new tires and heres my current list:

Front:
245/40/19s (stock size)

Rear:
275/35/19 OR
285/35/19

Does that sound good? or what should I tweek here? I want to have no ABS issues and my car is stock height. Should the rears be a 30 instead of a 35?

Front is 26.7"

275/35-19 will be 26.6"
285/35-19 will be 26.9"

Height-wise/ABS/etc; you are fine with either combo.

No, you don't want a 30 series for those combos. Way too small tire for that type of setup.

[Dagoon]

ok now my next question is with the 35 size will they rub?

[SpeedRacerX]

ok now my next question is with the 35 size will they rub?

Height-wise, no they won't rub. I run a 26.9" tall rear tire with no height-rub issues.

Width-wise, depends on the width and offset of your wheels.

[Dagoon]

rims are 9.5 wide, and offset is 45

[SpeedRacerX]

rims are 9.5 wide, and offset is 45

My rear setup is 285/35-19 on 9.5" wide +45 offset (just like you are describing). They did not rub until I added a full-size spare and one additional passenger and only on heavy dips or bumps and then they rubbed very slightly and very infrequently.

A 275 would probably give the extra clearance not to rub under these conditions because they are not as wide and not as tall.

I had my fenders rolled and slightly pulled and have no more issues. I also added a 5.5mm spacer to push them outward even further and they still don't rub.

[Dagoon]

i see you have the hankook tires, how are they? it was either that or the nitto invos

[BATOYGIO]

So I looked through and found that 40 offset on a 19x9.5 will work up front, but the rim I am looking at is 41mm offset. I know I can get a spacer to fix that but was curious, would a 41mm offset not rub the front strut on a stock car?

[Slizzo]

So I looked through and found that 40 offset on a 19x9.5 will work up front, but the rim I am looking at is 41mm offset. I know I can get a spacer to fix that but was curious, would a 41mm offset not rub the front strut on a stock car?

It would probably be close, but you should be OK I would think.

[SpeedRacerX]

i see you have the hankook tires, how are they? it was either that or the nitto invos

I like them for the money. They came highly rated by several car magazines.
In my experience, they do well in wet weather. I run them from about April to Oct/Nov.
Cornering, they've been fine for this heavy car.
Their straightline, dry traction seemed better last year when they were newer but it's also not that hot out yet. I don't have a lot of miles on them and plenty of tread left.
They stick better in temps above 70 degrees. The hotter it gets, the better they grip in a straight line.
With consistent temps below 40/45, I would take them off the car as they are too slippery when it gets near freezing.
I don't find them noisy.

@ SLizzo: what's your opinion on your Hankooks??? I'd like to hear too and it would help out Dagoon.

[Dagoon]

also if anyone has any reviews or experiances with the nitto invos. thanks alot so far for all the help

[Slizzo]

I like them for the money. They came highly rated by several car magazines.
In my experience, they do well in wet weather. I run them from about April to Oct/Nov.
Cornering, they've been fine for this heavy car.
Their straightline, dry traction seemed better last year when they were newer but it's also not that hot out yet. I don't have a lot of miles on them and plenty of tread left.
They stick better in temps above 70 degrees. The hotter it gets, the better they grip in a straight line.
With consistent temps below 40/45, I would take them off the car as they are too slippery when it gets near freezing.
I don't find them noisy.

@ SLizzo: what's your opinion on your Hankooks??? I'd like to hear too and it would help out Dagoon.

They've been good to me so far, haven't had them long though. They've only been on the car for a month or so. Haven't had much weather above 70 degrees here yet either, NE sucks...

They aren't any noisier than the stock RSAs, and I have a LOT more tread hitting the road on all 4 corners. Wet traction is a non-issue as you said, there's plenty of grip there.

[Dagoon]

So 285/35/19 on a +45 offset will rub slightly? Anyone else wanna
Chime in on that? Im stock height. I dont wanna roll, ill Grind the fender lip if i have to. Or ill just get the 275s

[G8GT721]

I know this gets beat to death but, I have the stock 18x8 which are 48+ offset, an if i buy an 18x8.5 with a 40+ offset. According to the 1010 calculator it will move the wheel 2mm out, correct? I also have the pedders track II with drop FYI

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[Slizzo]

I know this gets beat to death but, I have the stock 18x8 which are 48+ offset, an if i buy an 18x8.5 with a 40+ offset. According to the 1010 calculator it will move the wheel 2mm out, correct? I also have the pedders track II with drop FYI

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Yeah, with a 245 or 255 you should still be OK with no rub.

[Slizzo]

So 285/35/19 on a +45 offset will rub slightly? Anyone else wanna
Chime in on that? Im stock height. I dont wanna roll, ill Grind the fender lip if i have to. Or ill just get the 275s

You'll probably rub a little. Rolling would be better than grinding IMO.

[incon3037r]

A few links to help with wheel fitment.

http://www.flushstance.com/?page_id=635

http://www.flushstance.com/?page_id=643

http://www.flushstance.com/?page_id=621

[SpeedRacerX]

^^^ Cool data calcs. Thx for posting!!!

[incon3037r]

^^^ Cool data calcs. Thx for posting!!!

No problem. I think with your help, that website and some local friends I'll be able to fit the 20x12 on the G8!!!

[VegasNate]

No problem. I think with your help, that website and some local friends I'll be able to fit the 20x12 on the G8!!!

I'd be happy with 20x11s on the rear. More tire options that way.

[incon3037r]

I'd be happy with 20x11s on the rear. More tire options that way.

The wheels i want aren't offered in a 20x11 so 20x12 it is. I'm not worried about tire selection. You know I stick to my import heritage and will probably stretch the tire despite what everyone else thinks or says!! Nate you know I do my own thing, just as you do.:nah:

[incon3037r]

I plan on something similar to these rides, but not as low since I'm not bagged. My Xa's will get the job done.

11985
11986
11987
11988

[VegasNate]

Assuming you're runnin 245/35/20s on the front, what size tire would you put on the rears?

[incon3037r]

285 or 295

[Bonnetts02Vette]

How would vmr 713 19x85 +35 be with 255 tires and my biggest question would be what would I need to do as far as spacer or maybe roll fenders for 19x9.5 +45 with 295/35. Can it be done without mods to the inner fender? What size spacer? Or would 285 be my best bet?

[JoshHefnerX]

In the first post it states that 265/35-19 will fit the front - is that on stock 19" wheels? I'm assuming that it will also fit the back if so?

Josh

[SpeedRacerX]

In the first post it states that 265/35-19 will fit the front - is that on stock 19" wheels? I'm assuming that it will also fit the back if so?

Josh

Josh,

I truly can't remember. What I wasn't able to do, at the time, was show every possible wheel/tire/offset combo in a (together) format.

I know a 255 will not rub the stock suspension on stock wheels but I am not sure about a 265 on a stock wheel.


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[1gr8ate]

Will a 19x10 c6 wheel fit the rear of our cars? I think its a +67 offset

[Byoficr]

Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
245/40-19 3.9in 13.4in 26.7in 83.9in 755 0.0%
285/35-19 3.9in 13.4in 26.9in 84.4in 751 0.5%


This is what I was looking at any ideas? Stock 19's

[Slizzo]

I would not run a 285 on the stock G8 8" wide wheels.

[THE Adam V]

Looking to fit 295/30/19's on some 19x9.5 TSW Nurburgring's. Anyone running a setup like this? Will I need to roll fenders, cut the inside trim, etc?

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[SpeedRacerX]

Looking to fit 295/30/19's on some 19x9.5 TSW Nurburgring's. Anyone running a setup like this? Will I need to roll fenders, cut the inside trim, etc?

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I run a 295/35-19 on a 9.5" rim. Your 30 series is a little short but that's your call. As far as inside/outside clearance, what is the offset on that TSW? I used to know.....

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[THE Adam V]

I wasn't sure if i should run 30's or 35's thanks! Also the offset is +41

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[Slizzo]

You're gonna rub if you don't roll and do some other mods

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[THE Adam V]

You're gonna rub if you don't roll and do some other mods

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Such as? Are you talking suspension mods or just trimming the fender well trim?

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[SpeedRacerX]

Such as? Are you talking suspension mods or just trimming the fender well trim?

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You are fine on the inside. I run a +45 offset and I have no issues on the inside even with my tire being taller than stock. Your offset gives you even more inside space.

On the outside, I clear fine with a rolled fender lip but I also have a slight pull to my fenders. I can run my spacer making it a +40 (similar to yours) and still not rub. What I can't confidently tell you is if my slight pull is making the difference or not. Your offset puts you where mine would be with my spacer.

If you go with the 30 series (shorter tire) that will help guard against rubbing but only you can make the call on a shorter tire for looks, balance fr to rr, etc.

You will also need to trim the bracket that holds the rear bumper to the rear quarter panel behind the tire.

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[THE Adam V]

I'll just get the tires here and on the car. Then measure and decide where to go from there. If it will fit with minor work then that's what I'm going to do.

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[Slizzo]

You are fine on the inside. I run a +45 offset and I have no issues on the inside even with my tire being taller than stock. Your offset gives you even more inside space.

On the outside, I clear fine with a rolled fender lip but I also have a slight pull to my fenders. I can run my spacer making it a +40 (similar to yours) and still not rub. What I can't confidently tell you is if my slight pull is making the difference or not. Your offset puts you where mine would be with my spacer.

If you go with the 30 series (shorter tire) that will help guard against rubbing but only you can make the call on a shorter tire for looks, balance fr to rr, etc.

You will also need to trim the bracket that holds the rear bumper to the rear quarter panel behind the tire.

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Your pull makes a difference. :)

I rubbed a 285mm wide tire +40et on a 9.5" wide rim.

Get a really good roll on your fenders and see what you get, if you still rub (should be minor at this point) try pulling them a little. That or dial in a little extra camber if you're able (and want to). That's a pretty low offset on that rim with a 295mm wide tire.

[THE Adam V]

Okay so how far am I pulling the fenders? And at that point. Should I just go wider?

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[Slizzo]

Okay so how far am I pulling the fenders? And at that point. Should I just go wider?

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I don't think he pulled much at all, just very slightly.

But hey, if you think you can get a good pull on, what's to keep you from a 305 or 315? :)

[THE Adam V]

Okay so just ordered my tires,

My next question. Does this listing seem off to you guys at all?
http://www.ebay.com/itm/251319827607?item=251319827607&viewitem=&vxp=mtr

He lists the wheels as 19x10, but TSW doesn't make them in that size on their website.

Also there are no center caps. I am wondering if these are replica's possibly?

[SpeedRacerX]

Okay so just ordered my tires,

My next question. Does this listing seem off to you guys at all?
http://www.ebay.com/itm/251319827607?item=251319827607&viewitem=&vxp=mtr

He lists the wheels as 19x10, but TSW doesn't make them in that size on their website.

Also there are no center caps. I am wondering if these are replica's possibly?

All I know is that +37 rear offset will make matters worse for you with the outside fender. When going wide, pull the wheel inward with an offset in the +50 to +55 range but good luck finding anything that's not a) custom made like a CCW or Forgestar or b) made for a Vette where the offset it close but not necessarily safe for every day driving.

[THE Adam V]

Turns out those wheels were a 10.5 which i knew wouldn't work due to offset.

[THE Adam V]

19x9.5 +41 on all 4 corners should work fine right?

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[Slizzo]

19x9.5 +41 on all 4 corners should work fine right?

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Yeah, still need a roll if you haven't though with properly sized tires. Also possible you'll need a 1mm spacer for the fronts.

[Silverbacker]

With the wheel sizes specified below can I use a spacer to make the front wheels work or how close am I? Also, if these will work can someone please verify the best size tires for the front and rear? I don't mind using the "Persuader"(hammer), but I would rather not have to cut anything.

5x114.3
Front wheels: 19" x 9" 30mm offset
Rear wheels: 19" x 10" 50mm offset

Thanks!
Guy's and Girl's

[Slizzo]

Bolt circle is wrong. Won't fit the car, we are 5x120

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[Silverbacker]

Ok. Thank you Slizzo!

[BlakRam]

I'm looking at VMR 710's 18x9.5 +50 for the rear, I will run Nitto NT05R's. I know Nittos run smaller than most so I'm trying to decide between 285 or 305? I don't mind rolling my fenders but what else is needed for the 305's? Anyone running this setup?

[Slizzo]

I'm looking at VMR 710's 18x9.5 +50 for the rear, I will run Nitto NT05R's. I know Nittos run smaller than most so I'm trying to decide between 285 or 305? I don't mind rolling my fenders but what else is needed for the 305's? Anyone running this setup?

285s you won't need to roll with those wheels. 305s, not sure if they'll fit. You'll have to find the Monster Meats thread on the other board that Intense posted when they were doing 305s on the back of their G8.

[hellraiza]

Looking at 20x10 +40 wheels, if I stretch a 255/35 will they fit the front? I have done some research but only found 20x9.5 with 275's so it left me wondering. Also ordered Tein Springs so i know i'll have to roll the rears but I really want the ability to rotate my tires. the company also make a 20x8.5 +35 but they are obviously not as concave

[Slizzo]

Looking at 20x10 +40 wheels, if I stretch a 255/35 will they fit the front? I have done some research but only found 20x9.5 with 275's so it left me wondering. Also ordered Tein Springs so i know i'll have to roll the rears but I really want the ability to rotate my tires. the company also make a 20x8.5 +35 but they are obviously not as concave

You'll need a spacer to keep the rim off the suspension in the front. Put a tire properly sized on that rim if you're concerned about getting extra bite.

[hellraiza]

You'll need a spacer to keep the rim off the suspension in the front. Put a tire properly sized on that rim if you're concerned about getting extra bite.

Would a 5mm spacer be enough? I figured I would need one since I'm on stock struts. My main concern is the wheel sticking out too much with the spacer. Can't find any pictures of this setup

[Slizzo]

Would a 5mm spacer be enough? I figured I would need one since I'm on stock struts. My main concern is the wheel sticking out too much with the spacer. Can't find any pictures of this setup

My 20x9.5" +40 was just about flush with the outer fender, with a +5mm spacer you should be OK with the struts, but fenders might be an issue.

[hellraiza]

My 20x9.5" +40 was just about flush with the outer fender, with a +5mm spacer you should be OK with the struts, but fenders might be an issue.

Damn.. Looks like I'm gonna have to be a guinea pig on this one.

[SIX.OH!]

I have 20 x 9.95 TSW Nurburgrings all around. Right now I have 255/35/20 all around. Would a 275 in the rear work and would it give me any extra bite over the 255? And would it look ok with a little more rubber over the rim in the rear as opposed to pretty much flush with the rim in the front? Planning on stepping up to much better rubber either way, but wanted to go as big as possible in the rear while keeping aesthetics and functionality in mind as well.

[Slizzo]

I have 20 x 9.95 TSW Nurburgrings all around. Right now I have 255/35/20 all around. Would a 275 in the rear work and would it give me any extra bite over the 255? And would it look ok with a little more rubber over the rim in the rear as opposed to pretty much flush with the rim in the front? Planning on stepping up to much better rubber either way, but wanted to go as big as possible in the rear while keeping aesthetics and functionality in mind as well.

What's the offset on the rims? 275mm wide tire is the recommended size for a 9.5" wheel, so yes it will fit the rim. And they will provide quite a bit extra grip. I'd do 275mm all the way around IMO.

[SIX.OH!]

I'll have to check out the offset when I get off work. I'm sure it's on here somewhere, but how do you measure that? (wheels and tires were on the car when I bought it)

[dru21281]

I'll have to check out the offset when I get off work. I'm sure it's on here somewhere, but how do you measure that? (wheels and tires were on the car when I bought it)

All the measurements should be stamped on the back of the the spokes, so you will need to take off a front and rear wheel if they are staggered.

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[SIX.OH!]

Oh ok. That's easy enough. I didn't know it had the offset stamped too.

[dru21281]

Oh ok. That's easy enough. I didn't know it had the offset stamped too.

Yup everything is on there offset will begin w/et.

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[SIX.OH!]

Only had time to pull off one wheel real quick, but the diameter was all that was stamped on it (except the max load and some standards codes on the spokes). Doesn't even have the wheel width - says "20 x" then has a little rectangle where the width should be. Weird. It has A27 stamped in one spot. That wouldn't be the offset would it? Attached a picture - wheel looks bad from the back - yeck. (doesn't help that they're filthy - caliche gravel road and rain on Sunday)

[Slizzo]

Looks like the manufacturer didn't write it in.

Offset is the measurement of the distance that the mounting pad is from the centerline of the wheel (width wise). So, on a 9" wheel, you'd measure where the mounting pad is from the 4.5" centerline on the wheel. Positive offsets are towards the face of the rim, negatives are toward the inside of the wheel (in relation to the vehicle.)

A +40mm offset on a 9" wheel means that the mounting surface is 40mm outside (again, in relation to the vehicle) of the centerline of the wheel.

[SIX.OH!]

Looks like the manufacturer didn't write it in.

Offset is the measurement of the distance that the mounting pad is from the centerline of the wheel (width wise). So, on a 9" wheel, you'd measure where the mounting pad is from the 4.5" centerline on the wheel. Positive offsets are towards the face of the rim, negatives are toward the inside of the wheel (in relation to the vehicle.)

A +40mm offset on a 9" wheel means that the mounting surface is 40mm outside (again, in relation to the vehicle) of the centerline of the wheel.

Thanks! I'll try to check that out today - might be tomorrow. Do you have any pics of your summer setup by chance?

[Slizzo]

Thanks! I'll try to check that out today - might be tomorrow. Do you have any pics of your summer setup by chance?

All over the forum here already, search for posts by me.

[SIX.OH!]

Finally had a chance to take the wheels off to measure the offsets... only to find that the measurement were indeed stamped on the inside the wheel - on the edge. They are actually 20x8.5, not 9.5 like I thought, and the offset of all 4 wheels is 43. Why the previous owner spent that much money and decided to get all 4 wheels exactly the same size/offset is beyond me, but that's what I have now. So, I've heard that a 275 is the max for a wheel that is 8.5. Should I get 275 all around or is there any benefit from a little narrower (like the 255 that I have now) in the front and 275 in the back? Currently looking for pics of a 275 on a 8.5 wheel to make sure it won't be too much bulge. I know though that brand will affect that.

[-Ray-]

You can add an inch to the wheel. Weldcraft wheels in Livonia, MI can do it.

[GingerBeard Man]

I'm running OEM 20" camaro wheels. I haven't had much time to research, but I blew a tire out today hitting a pothole, and possibly did damage to the wheel.

I already need two new tires, so I am looking to possibly replace them all. What is the better option for a stock height vehicle? I MAY go lower on springs later on, but I also want more sidewall for protection that I currently have.

I know this has probably been asked a million times, but I am limited on free time, and could use a quick reply. I will research when time permits as well. Thanks for any advice. I need to have the car up and running ASAP.

Oh, and screw Dallas County and their crappy roads!

[Slizzo]

275/30/20 rear 245/35/20 front. Best bet for the G8.


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[GingerBeard Man]

Will a 35 series work well in the rear?

[THE Adam V]

Looking to run the 19x10.5 +27 TSW Nurburgring's. Is this even a possibilty? Or should I scrap the idea? Fenders are rolled and pulled majorly. I'm currently running the 19x9.5 +43's out back right now and they fit perfect. Just looking to get a little bit more rubber on the road.

[Slizzo]

Way too little offset. You'll be sticking out past the fenders, even when pulled.

[Boarderx3120]

This is complicated! Based on the info on the first page this should work without any rubbing, right?

Front 20x8.5 35mm offset - 245/35-20 tires
Back 20x10 40mm offset - 285/30-20 tires

I have all stock everything...I prefer not to have to roll the fenders

[TurboMike]

I have bone stock suspension with 285/35-19 (basically same tire size as you with smaller rim). I have 50 offset rims and mine rub on bad bumps with nothing in the back and rub all the time with 2 people in the back. But I'm not rolled yet.

Your wheel offset is 10mm closer to the fender, so I predict that wont work at all and might rub even with the fenders bend in (rolled).

[Slizzo]

This is complicated! Based on the info on the first page this should work without any rubbing, right?

Front 20x8.5 35mm offset - 245/35-20 tires
Back 20x10 40mm offset - 285/30-20 tires

I have all stock everything...I prefer not to have to roll the fenders


Bring offset up to +55 and you'll be close to ok.

[rockit88]

hi im trying to buy wheels right now and going nuts i wana run a 305 or min 295 i see intense has done this with a 11' wheel with +54 my question is can i do it with a 10' wheel with +58 if i have to i could use a 5mm spacer to get me at +53 thats pretty close to intense but not sure if it will rum after i do necessary mods rolloing cutting ect. any info will help im in rockland ny so if anyone is close to me id love to see your setup. keep in mind i am lowered with bc coilovers.

[firefighter]

I would think a 10" wheel is too narrow for a 305...

[rockit88]

little narrow but acceptable hard to find wheels in 10.5 with over +50'S offsets

[firefighter]

Consider also you can only go 255 maybe 265 in front. Having that much of a width difference can induce under steer even if you fit 275's up front.

Also the narrow wheel will make the sidewall of the 305's bulge.

All this can induce weirdness in a suspension that likes a square set up.

The car's body almost demands a staggered set up though.

I'm running 255/285 btw... my 1LE is getting either square 295's or 305's...


Just somethings to consider...

[G8ride]

Does anyone know if CTS V sedan rears "19x9.5" will fit on the front for a G8?

[BAdley13]

Great write up! im looking into some KM685 DISTRICT wheels. 20x8.5 in the front and 20x10.5 in the rear. seems like the fronts will fit fine. Do you think the rears will fit with an offset of 45 and tires of 275/30 20 and rolled fenders? or would i have to stretch the fenders out or stance it a bit?

[SIX.OH!]

Great write up! im looking into some KM685 DISTRICT wheels. 20x8.5 in the front and 20x10.5 in the rear. seems like the fronts will fit fine. Do you think the rears will fit with an offset of 45 and tires of 275/30 20 and rolled fenders? or would i have to stretch the fenders out or stance it a bit?

FWIW The first set of Bridgestone Potenza RE970 AS Pole-Position 285/30/20 that I had on my 20x10s in the back looked too narrow for the wheel. The Michelins I have now in my signature (same size) are perfect. 275 on a 10.5 would look horrible IMO. :/ Also FWIW, I had to roll and stretch my fenders and also cut the fender joint back behind the wheel for it to not rub with stock suspension. I only have a +35 offset though.

[Slizzo]

Does anyone know if CTS V sedan rears "19x9.5" will fit on the front for a G8?

Offset is too high, some need small spacers to fit V fronts properly on the front 19x9" +51et.

[cstmg8]

Do you guys think that a 20x8.5 et35 will clear 4 pot Brembo's?

[Slizzo]

Do you guys think that a 20x8.5 et35 will clear 4 pot Brembo's?

Largely depends on the design of the wheel and how the spokes form out to the barrel. Nothing wrong with the size of the wheel of the offsets however.

[cstmg8]

Yeah, I'll have to see how far the caliper sticks out from the hub. It's these wheels:
http://www.aspiremotoring.com/products/f1r-wheels-f21-hyperblack?option1=20x8.5%20-%201%20Single%20Piece&option2=5x114.3&option3=35&CAWELAID=120176380000013906&CAGPSPN=pla&CAAGID=27662028750&CATCI=pla-126893732696&catargetid=120176380000033229&cadevice=m&gclid=CjwKEAjwiMe8BRD0ts3Vtv-ohWgSJAAZurk16TdRMOawftffZH3qkEwdQQwygnQJ-oZQeu9oyRhXpRoCqgPw_wcB

[cstmg8]

Largely depends on the design of the wheel and how the spokes form out to the barrel. Nothing wrong with the size of the wheel of the offsets however.
Thinking about it now, it seems obvious. The spokes could bend/attach to the wheel at any angle/point.

[Nashcar]

First and foremost I've been running calculations and searching my butt off.

Is there enough room inside the rear wheel wells for a 28" tire? The car will be on coilovers so the height will be adjustable.

I want 295/35r20's on the rear. I know they are way bigger then factory. The car is tuned and I can compensate.

According the the specs at the beginning of this page someone tucked 295/30r20 on a +60 offset wheel. According to the tire/wheel calculators I have been abusing a 295/35r20 on a +50 offset will have more room between the tire and suspension then the +60 obviously. And it should be alright on the outside as well. Ran a comparison against my old Breyton set up 275/30r20 on a +35 offset. Rubbed over bumps at stock height with no rolling. The 295/35 on +50 would be tucked in an extra 5mm according to the calculator.

I will roll the quarter lip if I have too. I will also cut the bumper bracket if needed. I'm confident that width wise the tire will fit. But what about the overall height? Is there physically enough room in the wheel well?

I also plan on doing the Camaro rear cradle swap which I believe is supposed to pull the wheels in an additional 3mm on each side. Can anyone verify this? I don't see why an additional 3mm would make it rub on the inside. Running a calculation for the additional offset still shows it has more room then the +60.

Thanks in advance for taking the time to read this. And I'd appreciate if we could steer away from the "just run a 30 series tire" comments. I hate small sidewalls. These cars look great with larger wheels. I just need a taller tire to go with them to avoid the rubber band look.

[TooManyHobbies]

People run 28" drag race tires all the time. They will fit with the right combination of width and offset. You will need a roll. Also some suspension work to keep the tire off of the front of the wheelwell.

[Nashcar]

Off the front of the wheel well? Could you elaborate? Is it something that could be adjusted out with adjustable suspension parts?

[TooManyHobbies]

Off the front of the wheel well? Could you elaborate? Is it something that could be adjusted out with adjustable suspension parts?

If you do not drag race you may never have the issue, but under heavy acceleration the tire will push forward and contact the front of the wheel well. To combat this you need to replace the bushings in the rear suspension with poly/delrin.

[Nashcar]

I do occasionally hit the drag strip. I'm planning on doing the whole suspension with a mixture of poly, derlin and even some pieces with roto joints to reduce or eliminate unwanted movement. Thanks for clearing that up though! :cheers:

[Ruiz_G8]

so this may get some bashing but what would be an offset for wanting some wheels to make the car somewhat stanced or having a bit of poke.

[Chooch]

I reviewed the main sticky and think this will work for a staggered set up but want those that have done it, real results, if this has posed no problems
Rims are
Front
19x8.5 Offset 45 , tire is 245/40/19

Rear
19x9.5 offset 45 , tire is 275/35/19

Both tires are approx 26.6 height same as my current 245/45/18's

I do not want to have tire rub so limiting the rear width. Car is on stock suspension

Again, the front sticky says this should pass
Tires I am thinking of are General Gmax AS03's

[Slizzo]

More offset for the rear will be needed


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[Chooch]

More offset for the rear will be needed


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So on this set up, closer to a 50 Offset in the rear? Would it rub on the inner or fender edge as currently listed

[Slizzo]

So on this set up, closer to a 50 Offset in the rear? Would it rub on the inner or fender edge as currently listed

The lip on the fender is the issue. More positive offset moves the wheel further inboard. A +50 will be close, but should be fine on a 275mm wide tire.

[Slizzo]

So on this set up, closer to a 50 Offset in the rear? Would it rub on the inner or fender edge as currently listed

The lip on the fender is the issue. More positive offset moves the wheel further inboard. A +50 will be close, but should be fine on a 275mm wide tire.

For reference, on the Chevy SS (VF Commodore) the wheels are 19x8.5" +48et front and 19x9" +57et rear. Stock tires are 245/40/19 and 275/35/19.

[Chooch]

The lip on the fender is the issue. More positive offset moves the wheel further inboard. A +50 will be close, but should be fine on a 275mm wide tire.

For reference, on the Chevy SS (VF Commodore) the wheels are 19x8.5" +48et front and 19x9" +57et rear. Stock tires are 245/40/19 and 275/35/19.

My thanks to your advice and direction

Now it the process of finding wheels that have that at a reasonable cost.

Only reason I mentions the originals ones is Tire Rack said they would fit no problem, but your advice now makes 100% better sence. Again thank you

[Chooch]

Ok, decided against a staggered set up for various reasons, but got some eyes on a this

19x8.5 35 offset with 245/40/19 on all 4 corners

I know the offset is going to push this out 19 mm

Again stock ride height, per the first page sticky, this should work with no clearance issues, just want to be sure so when I get them, when installed, if they rub, my wife will pretty much give me the you are in trouble look

Thanks again

[Chooch]

And of course, found this and would prefer this set up for cost

19x8.5 45 offset with 245/40/19's

this seems to be closer to the 48 offset like stock, seems again should be fine, just want to be sure to prevent the wife aggravation look

Thanks

[Slizzo]

And of course, found this and would prefer this set up for cost

19x8.5 45 offset with 245/40/19's

this seems to be closer to the 48 offset like stock, seems again should be fine, just want to be sure to prevent the wife aggravation look


Thanks

Both wheels you listed will work.

[Chooch]

I went with 19x8.5 45 offset on 245/40/19's on all corners

Fits and looks perfect. Thank you Slizzo for answering and confirming. Really appreciate the help

[Slizzo]

No problem.

[itspooopface]

id like to go with 19x8.5 in front and 19x9.5 in the rear on my g8 but i am wondering will 255s work in front and 275s in the rear without modifications.

[Slizzo]

id like to go with 19x8.5 in front and 19x9.5 in the rear on my g8 but i am wondering will 255s work in front and 275s in the rear without modifications.

Depending on offset of the wheels, no problem.


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[mooredata]

Tire, ET Street S/S, P275/45-18 ,Tire Diameter Range:27-27.99”. 45 is a taller tire,will this work? Most of everything I see says 40 is desired.
Rim, 18X9,5X120 OFFSET +45

will it fit?

[Slizzo]

Tire, ET Street S/S, P275/45-18 ,Tire Diameter Range:27-27.99”. 45 is a taller tire,will this work? Most of everything I see says 40 is desired.
Rim, 18X9,5X120 OFFSET +45

will it fit?

Posted in your other thread, but this will be fine. Just be aware of Speedo inaccuracy.

[Samuel]

Posted in your other thread, but this will be fine. Just be aware of Speedo inaccuracy.
Verde 18X8.5 with a 38 mm offset and Pilot Sport 255/40-18 and Eibach Pro Kit 38137, which drops the car F+R one inch from OEM. No issues, great handling.
255/40-18 (26.0 diameter) is 4.7% smaller diameter than a 235/50-18 and 2.5% smaller diameter than a 245/45-18 (26.7 diameter)
255/40-18 is 2.5% smaller than a 245/40-19 (26.7 diameter)