A 285 will fit in the wheel well without rubbing but you will need a 9.5" wide wheel and careful offset/spacer planning. Stock 8.5" rims are essentially maxed out with 255 tires.
http://www.tirerack.com/tires/tires.jsp?tireMake=Kumho&tireModel=Ecsta+XS&sidewall=Blackwall&partnum=84WR7EXS&tab=Specs
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
Last edited by Topless; 09-12-2011 at 03:49 PM.
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