Lots of choices if you run a narrower tire on the rear. Anything from 225-255 will fit on a stock rear wheel. As long as the outer diameter is nearly the same (25") you will be fine. I often run a 225/45/17 on a rear wheel to good effect and a narrower tire offers better hydroplane resistance in rain and snow than a 255.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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