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MPH Calculator


RPM
Rear Axle Gear ratio (i.e., 3.08, 3.55, etc.)
Transmission Gear ratio (i.e., 2.54, 1.43, 1.00, etc.)
Tire diameter in inches (24.5, 26, 27.5, etc.)



The speed in MPH is miles per hour.

The same tire and RPM will give the following speeds based on the following gear ratio changes.

 
2.59 2.73 3.08 3.36 3.55 3.70 4.11 4.56