4-Speed Crank Axle Gearbox
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By altering the combination of four gears, four different gear ratios can be obtained: 126:1, 441:1, 1543:1 and 5402:1.
These low output speeds are ideal when high torque is required as opposed to speed. Comes with a 130 type electric motor, and a pair of crank arms for numerous applications. Uses 4.5V motor.
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