I Have "17 wheels now and want to move to "18, are there any odometer issues (mis-reads due to change in tire size)?

 

Hi flg, I use the tire calculator. Easy button.

http://www.1010tires.com/TireSizeCal...?action=submit

 

There's no way to reprogram the car so that this won't be a problem?

 

With a tuner like SCT or predator you can. But most people when they go +1 " go with a tire size that was the same or near the original tires O.D.

So if you are going from 235/55/17, and went to an 18" wheel you would go with 235/50/18 or 255/45/18.