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It does depend a lot on your local ruleset but here in SoCal I preferred running 17s. I liked 255 square for tight AX and 225/255 for the track. I did run square for a while at the track, but the data was pretty clear and favored 225/255, especially at Fontana and Laguna Seca.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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