Gates front sprockets are used in combination with a Gates belt (belt not included) instead of a chain. This sprocket is optimized for Di2 drivetrains. Consult the Gates Carbon Drive Bicycle Calculator to determine the correct part. Gates uses 4 product lines. These product lines are often used by Gates to indicate for which type of bicycles the part is intended. This product belongs to product line: CDX: high-performance commuter bikes, trekking bikes, mountain bikes, cargo bikes and e-bikes, and extreme conditionsProduct line: CDXMounting type: 5 bolts and BCD of 130 mmMaterial: 6061 aluminumFinish/color: Black anodizedGates Article number: 738177 EAN code: 4262428337892 Supplier number: 78980690-AM Retail packaging: Yes