Gates rear sprockets are used in conjunction with a Gates belt (belt not included) instead of a chain. Gates uses 4 product lines. These product lines are often used by Gates to indicate which type of bikes the part is for. This product belongs to product line: CDX: powerful commuter bikes, trekking bikes, mountain bikes, cargo bikes and e-bikes, and extreme conditions Product line: CDX Compatible: Any Shimano Body Mounting: Freewheel hub with 9 splines Mounting type: 9 splines Material: Stainless Steel Finish/color: Silver Gates Article number: 740591 EAN code: 4262428339810 Supplier number: 78980745-AM Retail packaging: Yes