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Gear Ratio Calculation

Example: 

  7th Gear Final drive
Drive gear ZG1 = 49 ZA1 = 17
Driven gear ZG2 = 32 ZA2 = 71
i = Z2 : Z1 (Z1 = number of teeth on the drive gear, Z2 = number of teeth on the driven gear)
iG = gear ratio = ZG2 : ZG1 = 32 : 49 = 0.653
iA = axle ratio = ZA2 : ZA1 = 71 : 17 = 4.176
itotal = total ratio= iG x iA = 0.653 x 4.176 = 2.730