Formulas for Calculating Gear Ratios, RPM's, MPH and Tire Diameter

If you wish to do the math on your computer's calculator,

To multiply, use symbol *, to divide, use symbol /

 

GEAR RATIO = RPM * Tire Diameter / MPH * 336

 

RPM = MPH * Gear Ratio * 336 / Tire Diameter

 

MPH = RPM * Tire Diameter / Gear Ratio * 336

 

TIRE DIAMETER = MPH * Gear Ratio * 336 / RPM

 

From, Carl/Roseville

 

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