That depends on how low your car is and how much neg. camber. I have run 17x8.5 wheels with 255 tires up front, stock suspension and no rubbing issues. Other Spec guys run 255s with a 5mm spacer, lowered car and more aggressive camber. one guy runs really low with 285s all around, fenders seriously rolled and still a bit of fender rub at full lock.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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