Here is just one of many calculators you can find. When I bought my GTS I was running the GT tires and wheels. That's just how it was. I now have 17" x 7" with 215 by 40 mm and it is a tad lower than stock 15's. You can't really tell by looking at the wheels and tires. Search around for a wheel or tire calculator if this one doesn't suit your needs. Tire Size Program
Joined: Mar 2004
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