This calculator will calculate the correct speed of your speedometer when you change tire sizes.  You need to know the overall diameter of your tires and can convert metric sizes (215/75/15) to inches using the 'Metric Tire Size Conversion To Inches' calculator.

 

  Checking Your Speedometer After Changing Tire Sizes

Orig Tire Diameter: Inches
New Tire Diameter: Inches
Speedometer Reading: M.P.H.

Actual:

MPH

 

 

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