Features1High Accuracy: CNC cutting of aluminum alloy is adopted to ensure the accuracy of product use. Better improve the performance of bike or mid drive motor. 2Compatible Model: The aluminum alloy 104BCD conversion base is ly compatible for Bafang mid mounted motor, better upgrade your equipment. 3Aluminum Alloy: The 104BCD chainring conversion set is made of aluminum alloy, the hardness is much higher than that of the original steel chain wheel, and it is sturdy and durable. 4Applications: The 104BCD conversion base can be used with a variety of mountain bike accessories and can be combined with a variety of configuration options for multiple routes, city traffic. 5Lightweight: The chainring adapter has a lightweight, 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/4.1inWeight: Approx. 175g / 6.2ozPackage List1 xChainring Plate