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Using 7x17 I would probably run 235 square. A 235 is oversized for the wheel but it works ok. A 245 is a no go. One of the top drivers in San Diego runs a 225 square on a light weight 2.5 Boxster and he is wicked fast. Close to Mark Foley in a Spec Boxster at Chuckwalla.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
Last edited by Topless; 04-19-2017 at 09:58 PM.
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