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I was wondering whether anyone is using 225/40R18 on the fronts with 285/35R18 (stock is 30) on the rears on a 2002 996 C2? Will this negatively impact the ABS & PSM? Details: I have a 2002 996 C2 with 18" rims. Stock rear sizes are 285/30R18 except only 285/35R18 are available for the Michelin Pilot Super Sports. I have done the math, they are about 1/2" taller in radius, and 81.223 vs 77.698" in circumference 3 -4 % error on the odometer, but my odometer is 10% fast anyway, so I dont care. I have looked at the forums and have not found a definitive answer. The tire place does not want to mount them on the car. They called Porsche, and they advised against it. OTOH, Porsche also advises against non N rated tires...Local tuner says it's fine. Please advise.