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I just added 18x9 and 18x10 rims...how far is my speedometer going to be off. I have an xcal 3 and I was wondering what is the number for the tire rotation setting to recalibrate my speedometer so that it is accurate?
 

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Abyssinian of AX
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You need to research the revs per mile of the tire and take into account any gear changes in the rear end. My guess is it will be off by maybe 5 MPH or so at higher speeds.

Jazzer :)
 
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