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Originally Posted by aki
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.
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I am going to have to politly dissagree with some of this
I ordered R-Comps and my wheels from tire rack and they refused to put them on cause they weren't within spec....BAH...Somtimes you learn more with going outside of the calculation.
I ran a 245's up front on a stock width wheel...THese where R compunds so really they were problaby a street tires equlivalnt of a 265. I got them on there and had no rubbing and the car did MUCH better than when I was running the 225s all around. THen I started to run a staggered setup due to the regulations and ran 245's front and 205's rear this greatly increased rotation....Still not enought to best the mini's but allowed for a fun fast G-stock car.
There are rules and there are some that should be followed to the T and others that can be stretched slightly...Wheel to tire width sizing can be one of those stretchable rules...