Features1Scope of Applications: 104BCD chainring adapter set is ly compatible for Tongsheng electric bike mid drive motor, better upgrade your equipment. 2Aluminum 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. 3High 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. 4Practical Accessories: It is a very practical electric bike repair and replacement accessory. Great for outdoor cycling enthusiasts, you can do it yourself. 5Lightweight: Aluminum alloy 104BCD chainring conversion kit is ver light in weight so that it is portable and easy to carry while riding out. And the damaged original parts can be replaced in time.SpecificationItem Type: 104BCD Chainring Conversion KitMaterial: Aluminum alloyGross Weight: 200g / 7.1ozBCD: 104MM / 4.1inApplicable: ly compatible for Tongsheng electric bike mid drive motor.Package List1 x 104BCD Chainring Conversion Kit