Front Sprocket Rear Sprocket Gear Ratio 18" Tire 20" Tire 21" Tire 22" Tire 13 36 0.3611 6.500 7.222 7.583 7.944 13 37 0.3514 6.324 7.027 7.378 7.730 13 38 0.3421 6.158 6.842 7.184 7.526
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