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Originally Posted by racepar1
I checked with a tire size calculator and the difference in CIRCUMFERENCE is only .06" between 275/40/17's and 245/45/17's. I dunno where you get 1/4" difference in DIAMETER from. If you fit 275/40/17's I can fit the 245/45/17's with no problems.
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Ehh, I just checked Tirerack on their specs sheet for the V710's and your right they are basically the same. I was going off what I saw in my garage, a 275/40/17 V710 and a 245/45/17 R6 side by side and there was a difference. I'll double check again tonight to make sure I wasn't smoking something last time I compared them.
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My fenderwells are excessively clearenced for the 255/40/17's that I have been running so I see absolutely no problem. I will be running a 4.36 rear end gear as well (currently 3.93) so the gear ratio difference is no concern. I can't be picky with free tires, and besides they will only last for one event.
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I've done zero prep on my fenders, so you will probably be fine. I know that I'm within 1-2mm of hitting the front apron with the wheel cranked, but you never have the wheel cranked this far while on track... at least you shouldn't be.