Overall Transmission Ratio I, Calculating

WARNING: This page is about a different car, the 2009 Audi TT and 2008 Audi TT. However, it is still accessible from the selected car via links, so may be relevant.

Example:

	6th Gear	Final Drive
Driving gear	ZG₁ = 34	ZA₁ = 22
Driven gear	ZG₂ = 31	ZA₂ = 72

i = ZG ₂ : ZG ₁ 1

i _G = gear ratio = ZG ₂ : ZG ₁ = 31 : 34 = 0.912

i _A = axle ratio = ZA ₂ : ZA ₁ = 72 : 22 = 3.273

i _total = total ratio = i _G x i _A = 0.912 x 3.273 = 2.985

Z₁ = No. of teeth drive gear, Z₂ = No. of teeth driven gear