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Go to Tire size calculator

It's a great page for calculating tires sizes. You input the stock size and then the size you want to change to. As long as you're within, I'd say 2% difference, then there is no problem. So if you went from the factory 17" 215/45-17 to 16" tires, you would go to 205/55-16 to stay the same.

Ride comfort and road noise are problably more dependant on the brand of tire you choose.

Also check out
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