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Allen,
What do you want to accomplish? When I first got my car the PO had installed some fresh cheapie 205 tires all around. Grip was lousy and the car was prone to oversteer. I have since switched to 225/255 and the car is much more balanced and predictable.
Some experienced track drivers run the same tire and wheel size front and rear (245 or 285).
Pros
Higher ultimate grip, zero understeer, rear of the car rotates easily, can swap race tires front to rear for even wear.
Cons
Higher steering forces cause the power steering fluid to boil more easily. A P.S. cooler may be needed. Heavy steering in low speed turns. Car will oversteer easily, more prone to snap spin. Scary in the rain as hydroplaning is much more likely with 245s up front.
If you are chasing a title at the track it may make sense for you. For a street car/weekend warrior the benefits of running the same size wheels/tires may be limited.
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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