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Ok so now I'm confused because I just saw something that said you can get multiple tire sizes for a 18 x 8.5 wheel. What tire size would be ideal, how do I know what size to go with. For reference I used this site. https://www.tyresizecalculator.com/t...dth-calculator
I assumed it would be a 255/35/18 because that is what the stock size is for the rear rims so I figured if im going square I could just do that all around. Would there be a difference in tire size depending if im on stock susp or rsr downs
Sorry for all the questions especially if they are novice, I really appreciate all of your help!
The tire size really depends on the application.
In the case of the IS, the F Sport rear wheel is 18x8.5 with a 255/35/18...so if you go square 18x8.5, you can certainly go with a 255/35/18.
An 18x8.5 rim by itself can hold a few different size of tires, the question is will they work for your application, meaning the IS.
Also you can deviate slightly from the stock sizing, once you don't go crazy, and it won't have any adverse effect on the vehicle...for instance you could go to a 265/35/18...but the 255/35/18 is a great choice for an 18x8.5 square setup.
Forgot to show this. Thanks for the help again Sasnuke. I did need a spacer 3.5mm in the fornts only as I was worried about the less than 1mm clearance to the center point of the 4 piston f-sport caliper lol. Other than very slight rubbing at high speed turns they turned out perfect. Now only if I could get the Tein coil overs on!!!
