Welcome to our store! 1,HIGH HARDNESS: Bike Chainring is made of aluminum alloy, which is much harder than the original steel sprocket. 2,HIGH ACCURACY: The 104BCD sprocket adapter adopts aluminum alloy CNC cutting to ensure the accuracy of product use. 3,HIGH PERFORMANCE: This round sprocket adapter effectively protects the bikes from scratches, prolongs wear life. 4,PORTABLE: The Bikes Chainring is lightweight, durable, easy to carry and easy to install. The surface is easy to clean. 5,COMPATIBLE: 104BCD conversion base is perfect, compatible with Bafang electric bike mid drive motor BBS01 BBS02. <p class="wang-edit-text"><p class="wang-edit-text"> <p class="wang-edit-text"> Item Type: 104BCD Sprocket Adapter Material: Aluminum Alloy BCD: Approx. 104mm or 4.1in Size: Approx. 74mm or 2.9in Fits: 7 8 9 10 11 Speeds <style> .wang-edit-text{ font-family:'Arial' !important } .wang-edit-text table { border-top: 1px solid 000 border-left: 1px solid 000 } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid 000 border-right: 1px solid 000 padding: 3px 5px } .wang-edit-text table th { text-align: center }< or style> 1 x 104BCD Sprocket Adapter Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.