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Effectively zero difference in handling if running similar tire compounds. 17s offer a touch smoother ride and tires cost less $$$. 18's allow you to run wider tires. I have run both sizes over the last 13 years and each has it's purpose.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
Last edited by Topless; 03-18-2018 at 01:40 PM.
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