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Gears Needed After Adding Larger Tires

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You will need to know your over all tire diameter in inches to use this calculator.  

If you have metric size tires (225/75/15) you can convert them to inches by using the 'Metric Tire Size Conversion To Inches'.  

This calculator will take your gear ratio and tire sizes and tell you what the effective or Actual Ratio is.  It will then suggest a New Ratio along with a Hi and Low alternative.  This New Ratio will return the vehicle to it's original performance after the addition of larger tires.  Obviously, you will have to round the new ratio to the closest available ratio.

 

  Gear Ratio Change From Tire Size Change - Find Gear Ratio Needed To Compensate
New Tire Diameter:
Old Tire Diameter:
Current Gear Ratio:
Actual

Ratio
Hi Ratio:
New Ratio:
Lo Ratio:

 

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