Speedo / Odometer concerns?

[phlydude]

I'm seeing people looking at options for winter tires (downsizing to 17" wheels) and people upgrading to 20" wheels but I am curious, anyone concerned with the speedo / odometer being off?

May not be an issue if you don't drive much, but someone that racks up the miles like I do, a slight variance could make that warranty mileage come and go slightly prematurely.

So if your new tire revs are off from stock (not that the stocker 18s and 19s are exact either, but they are close), is there a way to modify the programming to compensate for the tire size difference?

My current vehicle (Nissan) doesn't allow tweaking and this has been a huge concern when taking 17 or 18" truck tires and going to 20-22" lo-pros.

Am I making too big of a deal over a little thing?

[djchubbs]

ANY AUTOMOTIVE SHOP SHOULD BE ABLE TO GIVE YOU THE SPEED DIFF BECAUSE MOST SHOPS HAVE THE PROGRAM ON THEIR SYSTEMS