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...the MPH equation for tires:
MPH = [ 60 / (G × A) ]×[ RPM / rpm ]
...where:
MPH = vehicle speed, miles-per-hour
RPM = engine speed, revolutions-per-minute
rpm = tire speed, revolutions-per-mile
60 = conversion constant, minutes-per-hour
G = gear ratio (typically highest gear)
A = axle ratio
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