I have a G6 GT sedan with the 17" 225/50-17 stock wheels and tires and I want to upgrade them to the GTP 18" stock wheels. The only thing is I don't want to sacrifice my speedometer being off because I know the diameter of the GTP stock wheels and tires are bigger than mine. I was thinking of getting the GTP 18"s and putting 225/45-18 (as opposed to the 225/50-18 stock) on them. Does anyone know if this will effectively work in not screwing up my speedometer readings?
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In need of a little tire size help...
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