● Set gears, shafts, round hole ball bearings that can be set to the gear ratio (3.7: 1) between high speed gear and super fast gear ● For a mini 4WD you can use it widely, if you change from super gear, Counter (green) Only by changing the gear OK. Easy to change.Easy to change from the gear ratio other than the super-speed gear to 3.7: 1, replace the spur gear incorporated in the shaft with this set spur gear (yellow) I will. 

High speed EX counter gear set 3.7: 1)


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