Ratio i Calculating

Example:
- i = Z2/Z1 = number of teeth-driven gear/number of teeth-driving gear
- iG = Gear ratio = ZG2/ZG1 = 31/37 = 0.838
- iA = Final drive ratio = ZA2/ZA1 = 37/9 = 4.111
- itot. = Total ratio = iG x iA = 31/37 x 37/9 = 0.838 x 4.111 = 3.440