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Originally Posted by sperry
I am actually planning on reducing my overall diameter when I get some autocross rims and tires, since that will help the acceleration of the car.
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Yeah, like Scott said the overall diameter of your tires is part of the overall gear ratio between the engine and where the rubber meets the road. Reducing the overall diameter gives you a shorter (numerically higher) ratio, and increasing it gives a taller (numerically lower) ratio. So if you put some bling bling 20"s on the car or something and the overall tire diameter goes from 25" to 28" for example, then the car is gonna accelerate slower. Just something to think about when buying rims/tires since we usually want the cars to go faster instead of slower. So just throw some teeny little 10" diameter rims on there and you'll be super-fast, hehe.
