I have run both 225 and 255 up front. No clearance issues with stock suspension. The advantage of 255 F is 4 wheel rotation so you can make the most of a set of track tires. The advantage of 225 F, is that they are just a touch quicker on my car.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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