I would go with 17s. I don't know if you already have an S, but in case you want to upgrade your brakes, you'll likely need at least 17s. Tire choices and availability for r-compounds will be better for 17s. Plus, if you ever needed to, you can swap tires with your existing 17s. Oh, and unless you are looking for the last few tenths, I wouldn't shave the r compounds. I prefer to lose a few tenths and have tires that last a bit longer to save money.
Last edited by heyjae; 03-13-2009 at 10:59 AM.
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