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Old 01-29-2011, 03:42 PM
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Speedo and Wheels
Does anyone know much about the effects of changing wheel size on the speedo reading ?

I've currently got 18's on and want to change up to 20's. But before doing that I'd like to understand the effect this will have on the speedo. I'm thinking that after the change the speedo reading will be understated.

Is there some mathematical formula I wonder ? Like every one inch increase means x MPH effect on the speedo ? That'd be handy .....
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