| Re: What is largest tire size you have put on 07-09 STS?
P255/45R18 fit on the front of my 2006 just fine. Your 255/50R18's would be 3.57% too big. Your speedometer would be 3.706% low. Many people would consider this varience from stock to be dangerous and/or potentially damaging.
265/40R18 would be 2.56% too small. 275/35R18 would be 5.41% too big and I'm pretty sure they would rub.
Play around with this: http://www.1010tires.com/TireSizeCalculator.asp
Good Luck!
Last edited by EChas3; 07-03-09 at 01:56 PM.
|