Features 1、Compatible Models: Compatible for Bafang electric bike mid drive motor BBS01 BBS02 36T 104BCD, please confirm the motor model before use. 2、Sturdy and Durable: This sprocket adapter is made of premium aluminum alloy, the hardness is much higher than the original steel sprocket, sturdy and durable. 3、High Accuracy: CNC cutting of aluminum alloy is used to ensure the accuracy of product use, and high accuracy ensures accurate adaptation. 4、Chainring Conversion: This chainring adapter acts as a chainring conversion kit and can be used for repairs, replacements, maintenance and more. 5、Stable Performance: This mid drive chainring spider has stable performance. After installation, it has the same performance as the original parts, and can be well adapted to electric bikes. Specification Item Type: Mid Drive Chainring Adapter Shell Material: Aluminum Alloy Gross Weight: 159g / 5.6oz BCD: Approx.104mm / 4.1in Suitable: for 7, 8, 9, 10, 11 speed Package List 1 x 104BCD Chainring Conversion Kit