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| EQUATIONS FOR CALCULATING SPEED AND RPM |
| If you are changing the rear tire diameter, secondary drive ratio, or power output of your motor, the following calculations may be useful:
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S = Speed (mi/hr)
RPM = Engine revolutions per minute
Sr = rear sprocket tooth count, secondary drive
Pc = clutch sprocket tooth count, primary drive
G = gear ratio
Tc = circumference of rear tire: (dia. (ft) X 3.1416), typical tire is 25'' in diameter
Example: 2.083 ft (25'') X 3.1416 = 6.54 ft
Sf = front (transmission output) sprocket, secondary drive tooth count
Pm = motor sprocket tooth count, primary drive
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