Ever get a speeding ticket but you were not speeding on the odometer? 

Lots of people with aftermarket Wheels and Tires have this problem.  You think you are going 65 mph but the Police radar caught you at 71 mph.  

If there is a discrepancy we can show that your speedo MPH is different from its factory calibration.  Most cars and trucks are off a little from what you see on your dash from factory 1-2 MPH, especially if you have different wheels or tires.  The different circumference will throw off the factory calibration as much as 10-15 MPH

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