Features1High Quality Material: 104BCD Bike chainring is made of aluminum alloy material, which is much harder than the original steel chain wheel, strong and durable. 2Compatible Model: 104BCD sprocket adapter and conversion base kit is ly compatible for Bafang electric bike mid drive motor BBS01 BBS02. 3Stable Performance: Using aluminum alloy CNC cutting to ensure product use accuracy. Stable and reliable performance, providing you great using experience. 4Scope of Application: 104 BCD 32T chainring and conversion base set fits 7, 8, 9, 10, 11 speeds, can effectively improve the performance of your bike. 5Lightweight: The bikes chainring has a lightweight of 140g / 4.9oz, which is easy to carry and easy to install. At the same time it is durable and has a long lasting life.SpecificationItem Type:104BCD Sprocket AdapterMaterial: Aluminum AlloyBCD: Approx. 104mm/4.1inSize: Approx. 74mm/2.9inWeight: Approx. 140g / 4.9ozApplication: Fits 7, 8, 9, 10, 11 SpeedsPackage List1 x104BCD Sprocket Adapter