Quote:
Originally Posted by Msquared
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.
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Thank you for putting a few options out there. For now, we're going to stick with Clyde's 18x8.5 set that has some 275/35R18 Bridgestone RE-71R's from the great flood of Lincoln. They do look a bit pinched on the wheel, and at 10" of tread width versus an 8.5" wheel, are likely so. The gearing is a concern, given that we may now be looking at top of second gear in the 58-59MPH range. However it's also "proven" to work.
What are the thoughts on mixing sets such as a BFG rear and Bridgestone front, since contingency is not a factor?