Description: It would be a good choice for you to purchase the product because it has larger wide tooth design to provide maximum ring durability and drop performance. It would be a good choice for you to purchase the bicycle chain wheel because it can be installed easily. The product is made of 7075 aluminum alloy, which is light and strong, not easy to bend and deform. We have various styles for you to choose. It is suitable for Bafang BBSHD BBS03 central motor. Item Name: Bicycle Chainring Material: Aluminum Alloy Color: Black Specification: 39T/40T/42T/44T/46T/48T Applicable Motor: for Bafang BBSHD BBS03 Central Motor Size Details: 39T Outer Diameter: 16cm/6.3" (Approx.) 42T Outer Diameter: 17cm/6.7" (Approx.) 44T Outer Diameter: 18cm/7.09" (Approx.) 46T Outer Diameter: 19cm/7.49" (Approx.) 48T Outer Diameter: 20cm/7.88" (Approx.) Notes: 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. Package Includes: 1 x Bicycle Chainring 1 x Adapter 5 x Screws