Gear Ratio Calculator

Gear ratio is also called as speed ratio. The number of teeths on each gear determines the speed ratio or gear ratio. Number of teeths on a gear is usually proportional to the radius of gear pitch circle. So, the ratio of the size of the gear to the number of teeths in a gear will be the same no matter what the size of the gear is.

Gearbox Ratio Calculation

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Formula:

GF = (eRPM * h * 0.002975) / a MPH = GF / GR Where, GF = Gear Factor GR = Gear Ratio eRPM = Engine RPM (Revolution per Minute) h = Tire Height a = Axle Ratio MPH = Miles per Hour

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