Features1Aluminum Alloy Material: Made of aluminum alloy material, 104BCD sprocket adapter is much higher than the crude steel sprocket adapter in terms of hardness. 2CNC Cutting: Made of CNC cutting, the 104BCD bike chainring can ensure the accuracy of product use, durable and sturdy. 3Compatible: The 104BCD gear adapter is suitable for Bafang electric bike mid drive motor, for BBS01, for BBS02. 4Portable: Small in size and light in weight, the bikes chainring is sturdy, durable, easy to carry and easy to install according to different preferences to meet personalized needs. 5 Performance: The sprocket adapter can protect bikes from scratches, which can prolong the service life.SpecificationItem Type: 104BCD Chain WheelMaterial: Aluminum AlloyColor: As ShownWeight: 130g/4.56ozSize: Approx. 74mm/2.91inBCD: Approx. 104mm/4.09inSuitable: For 7,8,9,10,11 SpeedsPackage List1x104BCD Chain Wheel