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11 or 11.5 really does not matter much with a 315. Every one of these cars are different and each car can be different from side to side too. We have seen 1/4 inch differences in clearance from left to right on the same factory never hit car.....
One of the fastest track guys I know runs 275/245 while most prefer a 315 rear with a 255 front. I don't own a turbo bodied car anymore so I have not done any testing with different tire sizes to see the difference though...
Cheers
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Turn3 Autosport- Full Service and Race Prep
jeff@turn3autosport.com
997 S 4.0, Boxster 2.7 Race Car, Cayman S 3.8, 958 Cayenne TT, VW GTI 2.1 TSI, Mini Cooper S JCW, Cannondale Supersix EVO SRAM RED E-tap, Cannondale Slice SRAM RED E-tap, Giant Roam Hardtail- to ride with the wife.
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