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Originally Posted by Sirbelch
Revy did tell me that he fit a 245 tire on a 7.5 in wide wheel (i think thats the stock width). So with a 9 in wheel, a 245 won't be to much of a stretch. I have read on CRSX that a guy ran 275 up front and 245 in the rear for auto x. We have simular cars but i think that the wheel well is bigger on the rsx. So if measured right, it could fit.
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Well the calculation is .85(tire diameter) for ideal wheel width. So for 245 width 8" would be best. If you plan on going 9" then that'd be for a 275 or 265 width tire. The more you deviate from the intended rim/tire width, the less optimal your tire wear will be.
For 9" and 265/35/17 you'd need a 35-ish offset.
My concern though was more with how much 10mm lower offsets exactly impact suspension geometry. You could always find creative ways of sticking gigantic tires under the fender. The question is whether the stability/traction benefits outweigh all the negatives.