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To Determine Gear Ratio

Count the number of teeth on the pinion gear and count the number of teeth on the ring gear. Divide the ring gear teeth number by the number of teeth on the pinion. The result is your gear ratio.

Example

41 teeth on ring gear 41 teeth on ring gear 40 teeth on ring gear
10 teeth on pinion 12 teeth on pinion 13 teeth on pinion
41/10 = 4.10 41/12 = 3.42 40/13 = 3.08


Note: you may need to round off the number.