Upgrading to a larger tire will throw off the speedometer. Your dealer can recalabrate your speedometer for you. It cost me 50$ for my 33's.. And when I upgraded to 35's they said GM wont do them because they are not rated or something like that for the H3. So I'm just running them for now. Not sure if it affects shift points though. There are alot of experts on this forum that might give you some insight on this...
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