Features1 Material: Made of aluminum alloy, the 104BCD gear adapter is sturdy and durable, its hardness is higher than crude steel chainring. 2Suitable: The 104BCD chain wheel is suitable for Bafang electric bike mid drive motor, for BBS01, for BBS02, you can use it to replace the old parts. 3CNC Cutting: Adopted of CNC cutting, the 104BCD bike chainring can ensure the accuracy of it when in use, durable and sturdy. 4Lightweight: The 32T electric bike chainring is light in weight, convenient for you to replace the old or damaged parts. 5Scratchproof: The aluminum alloy gear adapter can prevent your electric bike central drive motor from scratches, prolonging its service life.SpecificationItem Type: 104BCD Gear AdapterMaterial: Aluminum AlloyWeight: 141g/4.97ozBCD: Approx. 104mm/4.09inSuitable: For 7,8,9,10,11 SpeedsPackage List1 x 104BCD Gear Adapter