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Rear final drive identification > < Code letters, allocation, transmission ratios, capacities

A3 Mk1

Calculating ratio “i”
Calculating ratio “i”
Example:
   
 6th gearFinal drive
Drive gearZG1 = 34ZA1 = 19
Driven gearZG2 = 31ZA2 = 63

i = Z2 : Z1 (Z1 = number of teeth on drive gear, Z2 = number of teeth on driven gear)
iG = gear ratio = ZG2 : ZG1 = 31 : 34 = 0.912
iA = axle ratio = ZA2 : ZA1 = 63 : 19 = 3.316
iov = overall ratio = iG x iA = 0.912 x 3.316 = 3.023
   

Rear final drive identification > < Code letters, allocation, transmission ratios, capacities