Features1Applicable Model: 104 BCD chainring adapter is compatible for BBS01 BBS02 mid drive motor. A good modification part. 2Aluminum Alloy Material: The material is aluminum alloy, the hardness is much higher than the original steel sprocket, sturdy and durable in use. 3CNC Cutting: Adopting aluminum alloy CNC cutting to ensure product use accuracy. Exquisite workmanship, beautiful appearance. 4Replacement Part: Chainring adapter is easy to install and disassemble, you can replace the old or damaged parts to obtain higher strength. 5Closely Fitting: Closely fit the original machine hole position with accurate shape and size design, hand feelings are still comfortable.SpecificationItem Type: 104 BCD Chainring AdapterMaterial: Aluminum AlloyColor: As Pictures ShownWeight: Approx. 58g / 2.0ozPackage List1 x 104 BCD Chainring Adapter