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L-faster 24V36V250W Electric Conversion Kit for Common Bike Left Chain Drive Customized for Electric Geared Bicycle Derailleur (Twist Kit)

The install instruction video：https://youtu.be/2dDEep9pu2U

L-faster 24V36V250W Electric Conversion Kit for Common Bike Left Chain Drive Customized for Electric Geared Bicycle Derailleur(Thumb Kit)

The install instruction video：https://youtu.be/2dDEep9pu2U