285/40-18 on stock 18 pics

[G8-4-Speed]

Just posting pics of my KDW 285/40's on stock 18's. Figured there are more than me wondering if this size tire would fit. The fronts are 255/40's...
I'll get some better pics once its outside and the tires get cleaned up. It needs some lowering springs to get rid of the large wheel well gap..

[norm8332]

Looks good. I'm doing similar except my rears are widened. No issues?

[Blackdevil77]

Thanks for posting this! I've been wondering if that size would fit on the stock 18's! I wanna get the Nitto NT05R drag radials on mine, the closest size is just that. 285/40/18

[Devilish34]

Looks good. I'm doing similar except my rears are widened. No issues?

^this. .those seem a little large for stockers
BlackBerry8330/4.5.0.175 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/105

[polo]

Thanks for posting the pics. They don't look near as ballooned as I thought they would. Can you get a closer pic of the wheel and tire at the same angle as the last picture you posted?

[SpeedRacerX]

Wow, very surprising - not from a clearance standpoint - but with a 285 on an 8" wide rim. Very good to know.

I knew the 255 on the front with stock offset would be fine.

285 in back with stock wheel offset.......just keep an eye on any interior rubbing and please report back.

PS: almost time to get those wooden bunnies out on the lawn. ;)

[G8-4-Speed]

THey are stock width wheels. There is plenty of room inside but it may come close to the lip on a lowered setup. Hasn't touched anything yet.

Have cut a 1.86 60ft on a good prepped track so far. I have another set of 18s that may get a set of NT05's for better traction.

[Posidon42]

I assume this could be done with the stock 19's too? Not sure what affect this would have on the ride though.

[STL-G8-GT]

I assume this could be done with the stock 19's too? Not sure what affect this would have on the ride though.

I was thinking the same thing. It really won't effect the ride at all. The tire is still the same height as stock or darn close.

[BORN2FLY]

I was thinking the same thing. It really won't effect the ride at all. The tire is still the same height as stock or darn close.

Yes, you are correct. The oem's are 26.7" and Ricks 285's are 27".

[SpeedRacerX]

Yes, you are correct. The oem's are 26.7" and Ricks 285's are 26.7".

A 285/40-18 is 27" dia, not 26.7". It's the 275/40 that matches diameters with the 245/45 front.

Doesn't really matter but it is not the same.

[BORN2FLY]

A 285/40-18 is 27" dia, not 26.7". It's the 275/40 that matches diameters with the 245/45 front.

Doesn't really matter but it is not the same.

You are correct, the 285 is 27"... I was looking at the wrong line on the spread sheet as i was typing.:cheers:

[DRCUSTOMPARTS]

The fronts are 26" diameter and the rears are 27" diameter, they aren't even close to being the same size. You might get a ESP/ABS warning eventually.

[grandmacpubah]

that can't be good lol you are going to have some handling issues for sure

[SpeedRacerX]

The fronts are 26" diameter and the rears are 27" diameter, they aren't even close to being the same size. You might get a ESP/ABS warning eventually.

Yeah, I wasn't even addressing the front, just answering the question about the rears. LOL.

[Ktlplxm]

For everyone contemplating this, remember that not all 285/40's are the same size, regardless of the similarities. There can be as much as 1/2-3/4 of an inch differences between brands or makes of tires. Just because a KDW (which run small) fits doesn't mean a MT or a Nitto (which run large) will.

[BORN2FLY]

For everyone contemplating this, remember that not all 285/40's are the same size, regardless of the similarities. There can be as much as 1/2-3/4 of an inch differences between brands or makes of tires. Just because a KDW (which run small) fits doesn't mean a MT or a Nitto (which run large) will.

You are correct...as I just purchased a set of Nitto NT05R's 285/40/18 and the specs are: 27" dia., 11.42 overall width, approved for a 9.5-11.0 rim and 767 revs per mile.:thumbsup:

[bwooten492]

For everyone contemplating this, remember that not all 285/40's are the same size, regardless of the similarities. There can be as much as 1/2-3/4 of an inch differences between brands or makes of tires. Just because a KDW (which run small) fits doesn't mean a MT or a Nitto (which run large) will.

Correct. I have Invo 275s on my stock 18's and they are probably the same size as 4 speeds 285's.

[Ktlplxm]

Ive always been a stickler when it comes to wheel and tire combos, proper sizing, matching the tire to the rim, no bulging, no pulling or pushing, and the bigger you go in sizes the more varied the sizes get. This is the first car in years I've had that hasn't had a 305/315/325/335/or345 tire under it, well it has had a 305 but just at the track

[DRCUSTOMPARTS]

Using too wide of a tire on too narrow of a wheel can make the center of the tread area bulge out, which causes it to wear prematurely in the center of the tire. Plus when the outer tread of the tire extends out past the edge of the wheel it can affect the handling.

[G8-4-Speed]

:nutkick:Blahh, Blah, blah.....the tire works and drives great.-Both front and rear, the tread lays flat. Cut a 1.86 60ft with them and drive back and forth to work 50+ miles with them. :brock:I have the tires, keep guessing how they work or don't......

[edmanet]

Ive always been a stickler when it comes to wheel and tire combos, proper sizing, matching the tire to the rim, no bulging, no pulling or pushing, and the bigger you go in sizes the more varied the sizes get. This is the first car in years I've had that hasn't had a 305/315/325/335/or345 tire under it, well it has had a 305 but just at the track

So you have been to the track....LOL

[GeorgeInNePa]

Just because something can be done, doesn't mean it should be done.

Everyone has to decide for themselves if they will not follow the manufacturers guidelines and recommendations.

[bwooten492]

:nutkick:Blahh, Blah, blah.....the tire works and drives great.-Both front and rear, the tread lays flat. Cut a 1.86 60ft with them and drive back and forth to work 50+ miles with them. :brock:I have the tires, keep guessing how they work or don't......

Agreed. After all its your money and your car.

[BORN2FLY]

Just because something can be done, doesn't mean it should be done.

Everyone has to decide for themselves if they will not follow the manufacturers guidelines and recommendations.

Isn't that the truth...lol...seems like everybody has done some kind of mod to their car, against the manufactures guidelines/warranty...lol

Nitto NT05R's 285/40/18 @27" arrive today along with 2 aftermarket rear wheels 18x9.5 :cheers:

[Panzer Leader]

Just because something can be done, doesn't mean it should be done.

Everyone has to decide for themselves if they will not follow the manufacturers guidelines and recommendations.

I would like wider tires but have to agree with George. I wonder if this could cause problems with the trans and differential at some point. I have to admit it does look pretty mean.

[Ktlplxm]

no reason it would cause trans or differential issues anymore than standard wheels and tires.

and yes Ed mine has been to the track to prove a point, but I still dislike drag racing, its fairly boring

[Panzer Leader]

no reason it would cause trans or differential issues anymore than standard wheels and tires.

and yes Ed mine has been to the track to prove a point, but I still dislike drag racing, its fairly boring

I stand informed.

[grandmacpubah]

:nutkick:Blahh, Blah, blah.....the tire works and drives great.-Both front and rear, the tread lays flat. Cut a 1.86 60ft with them and drive back and forth to work 50+ miles with them. :brock:I have the tires, keep guessing how they work or don't......

lol that's just a dumb attitude, sorry, but it is. Let me know how the work around corners at 70.

[locrzn#92]

I've got the 285 on a 9.5 wheel, looks like it works to me.

[Ktlplxm]

LOC u have a 9.5, it supposed to work, on a 8 or 8.5 it just isn't recommended

[caretaker]

RANT ON
Sometime some of you guys get so wrapped up in what is recommended you seem to lose sight of reality. If everyone went by "recommendations" we would not have the vehicles we have today.

Has anyone actually figured out the difference between these three sizes of tires on different rims? Well I did, and all these numbers can be backed up by different calculations you can find online.

I can relate to G8-4-Speed's Blah, Blah, Blah comment. He tried something and it is working for him. Just because you can't or won't take a chance and try something why should you knock his initiative. Personally, now that I have run the numbers, I intended to go with the same combination.

If you care to look at the numbers you will see that there is only .774" difference in cross sectional width between 245/45 - 18 and 285/40 - 18 tires when mounted on 8" wide rims. That is a huge .387" bulge in each sidewall compared to stock. If you look at the sidewall height you will see a whopping .107" difference. And if you look at the overall diameter as the tires wear you will see that the diameters could actually be the same.


Tire Min./Max. Cross Sect. Cross Sect. Cross Sect. Cross Sect. Cross Sect. Cross Sect. Cross Sect. Cross Sect. Cross Sect. Side Wall Height Max. Diam. Min. Legal Diam. Diam. Bald
Size Wheel Unmounted on 7.5” wheel on 8” wheel on 8.5” wheel on 9” wheel on 9.5” wheel on 10” wheel on 10.5” wheel on 11” wheel when new when new

245/45-18 7.5” - 9” 9.646” 9.446” 9.646” 9.846” 10.046” ******* ******* ******* ******* 4.341” 26.68” 26.117” 25.995”

255/45-18 8” - 9.5” 10.039” ***** 9.639” 9.839” 10.039” 10.239” ******* ******* ******* 4.518” 27.036” 26.474” 26.349”

285/40-18 9.5” - 11” 11.220” ***** 10.420” 10.620” 10.820” 11.020” 11.220” 11.420” 11.620” 4.448” 26.976” 26.413” 26.289”Of course this is only my :twocents: and I am sure someone will take exception to it.
And Yes. I know different brands may have slight differences in size,
but I don't believe it would be enough to make a difference.
RANT OFF

And of course now that I posted the chart which looked perfect in preview it is all screwed up.
Oh well, I'm not going to spend anymore time on this.

[DRCUSTOMPARTS]

The front tires are 1 inch smaller in diameter that the rear tires, I guess you missed that part. That's a serious mismatch there.

[caretaker]

The front tires are 1 inch smaller in diameter that the rear tires, I guess you missed that part. That's a serious mismatch there.


OOPS! I though he had 255/45-18's on front. You are right 1" difference, but still only .5" on ride height.
I don't think that will hurt. 3.49% difference.

I intend to do 255/45-18's on the front. Only .3" difference.

[BORN2FLY]

OOPS! I though he had 255/45-18's on front. You are right 1" difference, but still only .5" on ride height.
I don't think that will hurt. 3.49% difference.

I intend to do 255/45-18's on the front. Only .3" difference.
Rick G8-4-SPEED is running 255's up front.

[DRCUSTOMPARTS]

Right and he said they are 255-40-18's which are 1" smaller in diameter than the 285-40-18's in the rear. Here's a tire size calculator to see for yourself.

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

[BORN2FLY]

Right and he said they are 255-40-18's which are 1" smaller in diameter than the 285-40-18's in the rear. Here's a tire size calculator to see for yourself.

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

Well, It really don't matter to him anyway. He drives his car 50-60 miles a day, to and from work on roads that has plenty of curves in it, so obviously they are working for him without any problems.

So, give it a try......lol

[G8-4-Speed]

The one inch difference has not given me any issues with my ABS. I have 5% error on the rear tire size and trans output before error is reported and it seems to be working.

BTW 285/40-18 Nitto NT05's work great on a stock set of 18's also......1.68 60ft!!! Plus they look tuff as hell!!:brock: Didn't have any issues driving or rubbing.

Corvettes run 19 fronts and 20's on the rear for a nice look. It is not always about matching numbers, you need to match the preception of appearance.

[G8-4-Speed]

LOC u have a 9.5, it supposed to work, on a 8 or 8.5 it just isn't recommended

Right, they are a pain in the azz to mount if you don't have an expensive machine to do it with extra arms to push it down.

[Ktlplxm]

While we're "ranting"
I don't think anyone really had an issue with his front fitment; a 255 has always fit a 8" rim. The tire height is a little off but it doesn't matter much, .5" isn't enough to care. the major issue was the rear 285 mounted on the same 8" wheel. It isn't recommended for a reason. If he wants to run it, thats fine. The comments made about it were more to inform other people that it goes against manufacturers' recommendations. He isn't doing anything "new" or showing "initiative", people have been putting incorrect tire sizes on wheels for years; as a matter of fact there have been countless accidents where that exact occurrence was found to be the cause of the accident (hence the reason it isn't recommended). There was an incident in Myrtle Beach two years ago where a GTO owner went to make a hard corner, at speed, on dry pavement, with a set of (you may be able to guess it) 285/40/18 555R on a pair of GTO wheels, and wrecked the vehicle. In case anyone wondered, the recommended sizes were 9.5"-11 wheels (a wee bit off from 8"). The vehicle, as it was turning, hit a small 1-2 ridge in the road, unseated the bead, causing a blowout, and resulting in a wreck. The moron driver, who had been urged by friends and sale people alike not to put those tires on the those wheels, tried to take legal action against the manufacturer, and when it failed, tried to do the same to the company he purchased the tires from. Thankfully the posted and documented recommendations by the manufacturer kept them safe, and a waiver the tire dealer had him sign absolved them of responsibility. Those of us that pointed out the potential issue with the 285's did not do so to dissuade G8-4-Speed; he already purchased them and seems satisfied with the results. We were however informing future buyers who may not do the correct research and see the recommendations, purchase the tires, go out, maybe have a wreck, then blame others by saying "Well they said it would work on the forum's, how was I too know?" (dodging responsibility happens all the time). So, his response of "blah, blah, blah" was unwarranted, and could justifiably be called a "dumb attitude". "Rant" off

[DRCUSTOMPARTS]

Well said, and he's only fooling himself if he thinks he'll never have an issue. And if he does he'll come crying about how he wrecked his nice car, but he won't get any sympathy from us since we warned him.


Corvettes run 19 fronts and 20's on the rear for a nice look. It is not always about matching numbers, you need to match the preception of appearance.
If you knew how to choose the proper size tires, you would know that all the Corvette's tires have the same outside diameter even though the wheels are different sizes. Here's a tire size calculator, save it to your favorites folder because it's obvious you need it.

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

[polo]

^ well said!

[familycaronROIDS!]

I would put the 285's for track use only (straight line) not for twisties.

[G8-4-Speed]

[QUOTE=DRCUSTOMPARTS;232728]Well said, and he's only fooling himself if he thinks he'll never have an issue. And if he does he'll come crying about how he wrecked his nice car, but he won't get any sympathy from us since we warned him.


If you knew how to choose the proper size tires, you would know that all the Corvette's tires have the same outside diameter even though the wheels are different sizes. Here's a tire size calculator, save it to your favorites folder because it's obvious you need it.

http://www.tirerack.com/tires/SelectTireSize.jsp?autoMake=Chevrolet&autoModel=Corvette+Z06&autoYear=2008&autoModClar (http://www.tirerack.com/tires/SelectTireSize.jsp?autoMake=Chevrolet&autoModel=Corvette+Z06&autoYear=2008&autoModClar)=

Stock 2008 Corvette tire size
Fronts are 25.57"
Rears are 26.67"

Make sure to call GM and send them the Calculator too....
Only the rim width matches the tire.
Guess you can grab a dunce hat and join me in the corner. Before you grab your pitch fork, torches, and join your buddies, you may want to check you numbers first. You’re making your bus look shorter.
I don't need a calculator to do math, when I went to school you were required to know how to do it first.

Secondly, anyone dumb enough to believe that a wider tire will unseat it's bead because it is a little wide all belong in the same group together. Even more so if you try to sue for it. They belong in the group that sues for running into automatic door and burning there mouth with hot coffee.

The people with problems driving on too wide of a tire on small wheels are guys with drag slick or that type of tire with no sidewall support running on 15 psi or less of air. For example 10.5 slick on an 8" rim. That combo sucks to try and drive on with a 10" rim not to mention 8". Maybe you’re not old enough to know anything about driving something "old school" on some real slicks. Save the stories for guys that actually did it. Don't bring old school driving on drag slicks story's into a radial tire conversations. Bring something intelligent to the table not some stupid internet surfing crap. No one said anything about slicks but it’s the same story except "slicks" was changed to "radials".

Here is a legitimate failure list:
Under inflation causes tire overheating and sidewall breakdown. (like bending a piece of metal back and forth, breaks it)
Over inflation separates the belts, causes blisters. Shouldn't take too much explanation...
Bad alignments cause edge wear and bad handling.
Dumbazz drivers taking cars over a curb from trying to take a corner at 60 mph will tear up a tire too (maybe that’s how it came off the bead right before the wheel came off the car....)
Mounting too small a tire on too wide of a rim can cause it to lose a seal on the bead. (not too wide)

My tire on my rim will never cause me to get into an accident because of the tire, PERIOD; nor will that tire ever give me any problems because it is on my rim. I don't need any sympathy; I bought the tire, mounted it, balanced it, and put it on my car. You don't need to try and fool me into thinking I might have a problem. I am very secure and confident in the decision I made. Don't have any regrets.

I am by no means telling anyone to mount this tire on a stock rim, just a little show-and-tell. But thanks for bring the G8board banter and making this a bash fest, nothing like good times.....

If you want to talk about this tire on the rim, fine.
If you want to post some cautions or things to think about, fine.
Post information about warranty of a tire replacement? Why waste your time. Even if it is on the wrong rim, the rim just gives them an easier out. That excuse is just closer to the top of the list.
You might as well start beat up guys putting aftermarket wheels on their car. Probably have the same problem with 20" rims on a car that only came with 18' or 19". Cheep wheel are too heavy and void any factory suspension or steering warranties.
Don't bring outlandish myths that the car isn't safe to drive or the tire is going to fail at any minute or I can't drive around corners anymore.

***The only note of recommendation I would have for anyone the wishes to try this setup on a lowered car is to roll the fender lip. I have had no issue but I plan to roll it with my lip roller soon to be safe.***

[ULTRA Z]

Right and he said they are 255-40-18's which are 1" smaller in diameter than the 285-40-18's in the rear. Here's a tire size calculator to see for yourself.

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

don't forget that his tires are 27" on the proper wheel on the narrow wheel they can easly take up a 1/4inch top and bottom thats a 1/2 off due to sideway angle making them 26.5" and a good fit with the front this is why the car isn't throwing abs codes

Good job G8-4-SPEED had i not just bought a new set i would copy you but when these wear out i for sure will

[Ktlplxm]

The only one who has overreacted to almost everything that has been said on this thread is the OP. No one even said anything untoward to him, merely discussed things (as threads on boards are intended), yet he overreacted to everything. Sure, afterwords a few people may have responded with equal attitude, but what would you expect? On the "slick" conversation, G8-4-Speed is the only one who mentioned it. The incident I described was a radial, a true radial, and was a true occurrence at F-Body Week. As far as the attacking other posters, if you can name that many other common causes of tire failure (over inflation, under inflation, alignment, dumb ass drivers, too small of tire on too big of a rim) and not included an over-sized tire on too small of a rim (which pulls the lower edge of the bead away from the rim -due to the stiffness of radial construction- thereby increasing the likelihood of fully unseating the bead), then you sir should move straight to the front of the previously mentioned short bus. No one wishes you ill will on this entire topic, but you do seem to go out of your way to attack and insult those who do not share your view on the matter (which to me is the mark of a true G8boarder- maybe that's where the tendency for anger comes from). Personally I hope all goes well with the KDW's and you enjoy I nice full tread life with them, but I also hope no one else takes the chance with them. Having said that, if someone feels it necessary to make little snide comments or attack this post; feel free. It won't change anything. Some agree, some do not.

[majesticix]

interesting to see someone try this. I had asked my old brother about this last weekend (suspension engineer for Chrysler, Former SCCA President for Detroit, avid auto-crosser) who basically told me I could mount whatever I want to the rim. Not that he recommended it, but he's seen a guy mount a 275 on a 6" rim and race with it. We didn't get into much discussion about the safety or reliability, but if it was me and this was my daily driver, I personally would widen the stock rim or purchase a new set of rims. I plan to widen my 19" rims to accommodate 275's next year hopefully. Perhaps if I planned to just use the tires for racing at the track, it may be an option, but if see an increased risk for tire failure, it's not worth it to me. Tire's are one thing I take seriously. They can make all the difference in certain situations (whether your racing or recovering from lost traction).

Hope everything works out with the 285's on your stockers.

[GRRRR8]

Since I did this for years and am educated on the topic, here is what I found:

Big tire/small wheel 295/50/15 Radial T/A on a 7.5 and a 275/50/15 Radial T/A on a 7.5

With the 295 the car (77 Monte Carlo with 84 SS Monte Carlo wheels) looked killer
With the 275 it looked like the rear tires should be bigger

The 295s were finicky on air pressure. Too much air (32psi) the tires wore in the center
The 275s wre less finicky, but nontheless air pressure was not the same.

Using Drag radials as an example:

They will say recommended rim width of 8.5-10. Most drag racers find that a 8-8.5 is what will hook best.

A good rule of thumb for safety is: If the tread measurement is 10.6 you better be using a 8.5 minimum. You have to factor in that the 10.6 footprint will have a 11.5-12.0 sidewall width. That is a 3+in split and I would not push that or exceed that on a DD that is driven in all kinds of weather/distance/speeds. If it is a weekend toy.......that is a different story.

[G8-4-Speed]

Since I did this for years and am educated on the topic, here is what I found:

Big tire/small wheel 295/50/15 Radial T/A on a 7.5 and a 275/50/15 Radial T/A on a 7.5

With the 295 the car (77 Monte Carlo with 84 SS Monte Carlo wheels) looked killer
With the 275 it looked like the rear tires should be bigger

The 295s were finicky on air pressure. Too much air (32psi) the tires wore in the center
The 275s wre less finicky, but nontheless air pressure was not the same.

Using Drag radials as an example:

They will say recommended rim width of 8.5-10. Most drag racers find that a 8-8.5 is what will hook best.

A good rule of thumb for safety is: If the tread measurement is 10.6 you better be using a 8.5 minimum. You have to factor in that the 10.6 footprint will have a 11.5-12.0 sidewall width. That is a 3+in split and I would not push that or exceed that on a DD that is driven in all kinds of weather/distance/speeds. If it is a weekend toy.......that is a different story.

Tires are 10.5" sidewall to sidewall mounted on the stock 18's for both the Nittos NT05's and KDW's. The KDW has a more rounded foot print and the Nittos have a slightly wider square-off foot print. The contact patch of the KDW 285's is only 9.25" to the ground and the Nitto's were 10". The stock 17" GTO wheels that I have seen running the 275 Drag Radials are a shorter sidewall and 10.675" sidewall to sidewall, 10.5 footprint. Those push the envolope much further than the 285's on the 18's. Just something to compare against....

Good stuff the think about, thanks for the input. I know the 285's numbers look huge for the 18" wheel and I held out from buying them for a long time waiting some else to be the test dumby but I found a set mounted on a set of 10" wheel and took some measurements. Once I saw what the tire actually measured it made me feel much easier about taking the risk against what is recommended. There are a lot of guys looking to hook without extra money to burn. Being I took the dive on them and was impressed of how well the fit considering the size, I felt the this forum was a good place to show my results, especially since there are a lot of guys dumping there 18's. I am not endorsing the size, just showing my results and my judgement of there fit. Everyone can do what they like but I am sure there are plenty that appreciate someone sharing this info instead of hoarding like some great secret or saying it just wont work because that is what the spec sheet says. Good luck guys and make whatever call your comfortable with. If your in the area and want to see them on the car in person, just PM me.

[1meand]

I'm guessing that this is going to be a little different with 19" rims since the sidewall is going to be shorter. I know a 255 would work , but what about a 275? With my luck, I don't want to be the one who tests this first. I'm probably better off to stick to my plan of widening the stock rims to 9" and going from there.
G8-4-Speed, do you have any pictures of the back of the car showing both rear tires? Thanks.

[norm8332]

I might have tried this with my 255/45-18 fronts and not had the rear wheels widened had I known the KDWs ran small like they do, but only with the KDWs. Thanks for sharing.

[ULTRA Z]

as someone that does more reading post than posting here i must say i'm kinda upset at the way this turned out. this is the kinda arguement i would expect on ls1tech..... everyone here has been very friendly and thats why i like this sight so much also cause people try things most poeple think won't work and with there hard earned money test it and give us input on there results. I'm sure if he has issuse in the future he will let us know but he may not......

thanks

[DRCUSTOMPARTS]

don't forget that his tires are 27" on the proper wheel on the narrow wheel they can easly take up a 1/4inch top and bottom thats a 1/2 off due to sideway angle making them 26.5" and a good fit with the front this is why the car isn't throwing abs codes.
The width of the wheel won't change the diameter of the tire by 1/2", I don't where you came up with that, lol.



Good job G8-4-SPEED had i not just bought a new set i would copy you but when these wear out i for sure will
Monkey see, monkey do....

[ULTRA Z]

i came up witht that from buying and trying. If you knew me you would know i'm known for my ability to make any car i touch launch and short time very nicely. and it comes not only with susp. but knowing and testing tires, air pressures, and so forth. Say what you want but you won't affend me. You only show how big a ass you really are.

[DRCUSTOMPARTS]

Stock 2008 Corvette tire size
Fronts are 25.57"
Rears are 26.67"
The Corvette is designed for different size tires and the G8 isn't, that makes a world of difference in handling.

[ULTRA Z]

so you disagree that you could lose a 1/4 inch in angled sidewall ..... thanks for your info i'll note it on my kids dry erase board

[ULTRA Z]

not a nuff to factor in anything . kinda like taking your k@n airfilter off helps air flow just not a nuff to affect track times lol


driver more than makes that differance

[DRCUSTOMPARTS]

Where did you learn about cars, from playing with Hot Wheels? lol

[ULTRA Z]

your very funny.... aren't you the sharp one the same guy that posted corvettes have the same height front and rear tires then posted they were designed to have 25.57" fronts and 26.67" rears...... i did enjoy my hot wheels when i was the age your acting but i then moved on to real cars and have built a few but i don't have to prove that to you now do i. so what about you ??? were did you learn about cars oh nevermind it don't matter now does it ...... well gotta go running with the family once again i'm glad he tried this i know a lot of people been wanting to but didn't

[DRCUSTOMPARTS]

I know nothing about Corvettes and most cars do have the same size diameter tires, so I learned something today. But it's evident you have a lot to learn to get to my level of expertise.

[ULTRA Z]

RIGGGGGHT ok sure thing you have thought me nothing today but i'm sure there is things you know that i don't just like i know there is things i know you don't thats why it is important for everyone to post what they do right or wrong so we all can learn from it and negitive post will make the ones reading think twice before sharing what they do.... good day DRCUSTOMPARTS

[DRCUSTOMPARTS]

thats why it is important for everyone to post what they do right or wrong so we all can learn from it
Everyone pointed out that G8 4-speed did the wrong thing, yet you still think it's ok. So it seems you aren't learning anything....

[ULTRA Z]

but the facts are that they fit and aren't throwing any codes as far as them wearing improperly that can be manipulated by air pressure. so the wrong thing is a opinion in this case. the facts say he did good time may change it he will have to get some miles on them to see that for sure but as of right now it isn't wrong. this is simular to some of the guys around my area here telling me my susp was set up wrong and talking bout it like i was stupid mean while i was winning the races and hooking everywhere while they were fighting traction issues. i was wrong like he is wrong but mine worked like his is working

[DRCUSTOMPARTS]

You can use Vise-Grips to loosen and tighten a bolt, but most people know it's not the right tool to use. And if you do it over and over the bolt will have to be replaced since it will get chewed up. So just because he's not having any problems now doesn't mean he won't in the future.There's no doubt that mounting a wide tire on a narrow wheel will lead to premature wear in the center of the tire, and decreasing the tire pressure to try to eliminate that is not the right thing to do.

The tire was designed to be inflated to the proper amount and each car requires the tires to be inflated to a minimum amount, and if you deviate from that then the you're flirting with disaster. If you're ok with that then do what you want, it's your car and your life that's at stake, not mine. Just don't tell other people it's ok do something because you think it is.

[MGM GT]

I know nothing about Corvettes and most cars do have the same size diameter tires, so I learned something today. But it's evident you have a lot to learn to get to my level of expertise.

Can you take your expertise and go find a job so you stop posting BS all day?

[DRCUSTOMPARTS]

Why don't you do your job instead of surfing the internet when you're supposed to be working and stop worrying about me. No wonder our country is going down the drain, people don't focus on being productive.

[ULTRA Z]

and if he does he can post up and let us know and if he don't i hope he post and lets us knw he has had no issues i have mounted tires the were2 to 2.5 inches wider than the wheel before with NO issuse so he might not have any i do however wish i had the money to get 4 sets of wheels in different widths but i don't have it that good so sometimes i gotta make what i got work

[MGM GT]

Why don't you do your job instead of surfing the internet when you're supposed to be working and stop worrying about me. No wonder our country is going down the drain, people don't focus on being productive.

haha I love it when people show ignorance

[ULTRA Z]

if you will go to a tire size chart but a tire company you will see that the taller the tire the smaller wheel THEY say you may run some of them are even 11.2" wide and they say run a min. 8" wheel thats 3.2 inches narrower than the tire. the tire we are talking about is 11.2 so is he really that wrong for trying this well NO

i'm not saying its not wide for the wheel but its not crazy to try you know you got me wanting to get a set and try them cause i'll test the shit out of them and post it good and bad to bad this isn't about a magnacharger i'd much rather buy and test that :)

[DRCUSTOMPARTS]

Besides I have a job, I make custom car parts in my garage. If you knew anything about a business, sometimes I'm busy and other times I'm not depending on the orders I receive. When I'm not making parts, I also sell other things to make money, and I'm doing that right now. I don't have to watch over it since it runs on it's own.

[MGM GT]

Besides I have a job, I make custom car parts in my garage. If you knew anything about a business, sometimes I'm busy and other times I'm not depending on the orders I receive. When I'm not making parts, I also sell other things to make money, and I'm doing that right now. I don't have to watch over it since it runs on it's own.

Appears that with your constant posting your not making many parts. I don't know anything about business as I'm too productive running multimillion dollar projects.

[DRCUSTOMPARTS]

I don't have to make parts everyday of the week to pull in a lot of money from my business, it's bad you have to though. lol Like I said, I'm making money right now and I don't have to babysit it. I'm not impressed that you're working on expensive projects. You're not pulling in that amount of cash, so put 50 cents in the phone and call someone who cares!

[MGM GT]

I don't have to make parts everyday of the week to pull in a lot of money from my business, it's bad you have to though. lol Like I said, I'm making money right now and I don't have to babysit it. I'm not impressed that you're working on expensive projects. You're not pulling in that amount of cash, so put 50 cents in the phone and call someone who cares!

haha you missed it...

[DRCUSTOMPARTS]

Your replies seem to be lacking in information, like you know I'm right and your wrong, but you don't want to come out and say it. That's ok maybe someday you'll be as successful as me!

[MGM GT]

Your replies seem to be lacking in information, like you know I'm right and your wrong, but you don't want to come out and say it. That's ok maybe someday you'll be as successful as me!

I don't know what to say I checked out your website... and I'm awestruck!!! WOW!! With all those sweet parts you must be a multi-millionaire!!

[Wag 42]

Well, for all of you nay-sayers. I have been running 265's on 7 inch rims for nearly 10 years and have never had a problem, and experienced excellent tread life. I can easily go to 285's per many tire calculators with no issues.

Of course, this is on my truck! I make no claims to being any kind of expert, and not trying to state the obvious, but common sense tells me the sidewall height really plays a critical part.

Come on guys, let's try to keep it loose and fun.

[DRCUSTOMPARTS]

I know they're nothing fancy, but I make all those parts with a drill press/band saw/belt sander. Of the many thousands of parts I've made, nobody has ever had trouble with them fitting on their car. I'm sure there are very few people that could accomplish that using the machines I have. Everyone is always very satisfied with the quality of my work, and the results they get from installing my parts on their car. Plus I don't have to advertise to get business, every order I get is from word of mouth, so that speaks for itself.

[616 of 933]

i think we need to get this back on topic. The only question I have for the OP is do you like the ride and how does it handle turns, corners?

[GeorgeInNePa]

[mod powers, activate!]That's it, we're done comparing E-penises! Everyone calm down, or I'll pull this thread over and hand out time-outs![mod powers, deactivate!]

As I said before, everyone has to decide, for themselves.

[Wag 42]

Damn George, that yellow you're using is hard to read-or maybe it's just my old eyes.

[ULTRA Z]

i'm 26 and can't make it out ??? but yes back to the topic ...... i wanta know how it drives also

[G8-4-Speed]

I'm guessing that this is going to be a little different with 19" rims since the sidewall is going to be shorter. I know a 255 would work , but what about a 275? With my luck, I don't want to be the one who tests this first. I'm probably better off to stick to my plan of widening the stock rims to 9" and going from there.
G8-4-Speed, do you have any pictures of the back of the car showing both rear tires? Thanks.

I'll see what I can do....

[G8-4-Speed]

i'm 26 and can't make it out ??? but yes back to the topic ...... i wanta know how it drives also

It drives great. The only difference is it takes more effort to get her sideways and it doesn't spin all the way thru second anymore. You can not tell driving that there is a different tire on the rear. I don't road race but I have been thru some curves pretty aggressively with no issues.

[parish8]

thanks for the info. i might give this a try when i wear out my 265 mt dr's. i love the look of big back tires.

[ULTRA Z]

same here i'm going wider wheels in time but if i can do the tires now and wheels later thats GRRRR8

[GeorgeInNePa]

Damn George, that yellow you're using is hard to read-or maybe it's just my old eyes.

I'm using DarkVision, looks cool on that...

;)

[ULTRA Z]

can't wait to see that picture

[G8-4-Speed]

Not the greatest shot but you get the idea. It would be a week before I get a chance to try again.

[vic2186]

are those drag radials or regular tires

[bwooten492]

are those drag radials or regular tires

Its a really aggresive street tire.

[vic2186]

oh

[BlownPoncho]

so I just put a 285/35 on my g8 with stock 18s yeahi know they are short and im gonna eat some more gas but that is ok as long as i dont slip at the track this weekend lol... anyway i went with michelin pilot sport a/s because i got them for CHEAP!!!! $45 per tire.... grrr8 deal

[SpeedRacerX]

Sorry to revive this thread and maybe jack this one but I have a related question, especially after seeing how this worked out for Rick.

Right now, I'm running a 285/35-19 our back on a 9.5" wide rim and +45 offset. I did a lot of measuring this week and I should have no problem fitting a 305/30-19 in the rear - they shouldn't rub on the inside, I'm not lowered so since I'm having no issues today with the 285s sitting under the fender lip and I expect no issues with the 305 on the fender lip with rubbing, and they will finish filling out the wheel well to the edge of the fender lip. They WILL NOT stick out of the fender and look like a hot wheels toy.

So.......the question FINALLY...any chance a 305 will fit on a 9.5" wide rim???????????????????????????????????

I saw one website that said 9.5" was the absolute minimum and other sites that said I need a 10 or 10.5" wide rim.

After seeing how a 285 fit an 8" rim; what do you guys think about a 305 fitting a 9.5" rim??

I'll put a 265/35-19 on the front and both diameters will match just like Intense did with their Monster Meat thread. He had a different rear offset (closer inward) than I do which is why he had to trim that part on the inside; I won't have that problem.

Thx!

[GeorgeInNePa]

So.......the question FINALLY...any chance a 305 will fit on a 9.5" wide rim???????????????????????????????????

I saw one website that said 9.5" was the absolute minimum and other sites that said I need a 10 or 10.5" wide rim.

After seeing how a 285 fit an 8" rim; what do you guys think about a 305 fitting a 9.5" rim??


My recommendation is to follow the manufacturers recommendation.

Now, you're going to get someone to post after me saying you can put 345s on an 8" rim, he's done it and had no trouble, but I like to say the people who make it know what's up.

[Ktlplxm]

My recommendation is to follow the manufacturers recommendation.

Now, you're going to get someone to post after me saying you can put 345s on an 8" rim, he's done it and had no trouble, but I like to say the people who make it know what's up.

+1

[1meand]

My recommendation is to follow the manufacturers recommendation.

Now, you're going to get someone to post after me saying you can put 345s on an 8" rim, he's done it and had no trouble, but I like to say the people who make it know what's up.

Not to argue, but the manufacturer has to factor in a safety tolerance to cover their butts too. So what they say won't work, might in fact work, but with not enough safety cusion that they are comfortable covering in court if something happened. It all comes down to Judges, Lawers, and Law suits. With that said, if you excede the manufacturer's recommendation, you can only blame yourself if something goes. I'll shut up now.

[irnwkrkev]

305 vs 285 = 20mm 8"rim vs 9.5"rim = 1.5" or roughly 38.1mm So compared to a 285 on a 8" rim you are allowing more rim per mm of tire size. I would think that the height difference (18" vs 19") is not in your favor though. The thinner the tire the less room you have for the adjustment of the tire width to rim width. I am on my fourth set of 285's on my old truck with stock 16" rims with no problems. If you're not doing it for a drag radial I wouldn't bother. I've seen far better 60' times with stock 245's on 18's vs the 275's I have on 20's. Wider doesn't mean much when you have to go with 30 series tire. JMHO

[SpeedRacerX]

Good stuff everyone. I was contemplating the new sizing for 75% visual appeal, 20% extra DD street traction, and 5% just to prove to myself that I can get a 305 back there. I probably will NOT use these for the track - get a drag radial for that.

[HoldenMan21]

My recommendation is to follow the manufacturers recommendation.

+2

[norm8332]

I was thinking about 305s on my widened 9.5" stock 18s. But with the offset I have of 62 with a 5 mm spacer (67 W/O), I would have to trim plastic etc.

[SpeedRacerX]

Thanks for all the feedback guys. I will NOT be trying a 305 on a 9.5" rim. If/when I want to go to a 305, it'll be on a properly fitted rim, even if that means trimming some plastic.

[shane]

any better pics yet?