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Using smaller than recommended wheel sizes usually results in uneven tire temps so you probably won't get the most out of those 245s. Will they perform better than 225s on the front?? I don't know. On my car the fastest big track setup is 225/255 while the fastest AX setup is 245 square. I run 245 tires on 8.5 rims.
YMMV
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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