Gear Ratio Calculation

WARNING: This page is about a different car, the 2014 Volkswagen Jetta and 2013 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

Example:

	7. 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)

i_G = gear ratio = ZG₂ : ZG₁ = 32 : 49 = 0.653

i_A = axle ratio = ZA₂ : ZA₁ = 71 : 17 = 4.176

i_total = total ratio= i_G x i_A = 0.653 x 4.176 = 2.730