225s will work on 7x17" wheels. 255s will work on 8.5x17" wheels. With stock suspension I didn't need a spacer for the 255s up front. With PSS9s a 5mm spacer does the trick. Keep in mind that 255 fronts are not really recommended for the street. If it rains the hydroplane speed will be pretty low.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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