Quote:
Originally Posted by conemark
Well, we went and did it: A 2018 1LS is in our hands and now the tire shopping begins.
A little help please: Does the "tread width within a half inch of wheel width" rule apply to the A052's, and possibly the Falken RT660's? Both of those tires come in a 255/40R18 that measures 9.4" of treadwidth.
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You can just look up the tire companies' recommended rim widths for those tires. Both of those tires in that size recommend 8.5-10 rim widths. Your car has 18x8.5" wheels, right? So you'd be covered.
That said, for autocross or road course usage I'd also look at two other options. One would be the 245/40/18, which is a bit narrower and shorter but is less "pinched" on the wheel. It might actually work better for you because of that - I seriously doubt it would be slower. Also, you could try the 255/35/18, which is just as wide but an inch shorter than the 255/40. That would lower your CG and roll centers a useful amount and effectively shorten your rear gear ratio. This could be helpful it doesn't cause you to have to shift between 2nd-3rd on most courses. Both tires come in those two alternative sizes.