SRAM GX Type 2.1 10-Speed Long Cage Rear Derailleur Black Clutch 10spSRAM GX 10speed Rear Derailleur Type 2. 1 (T2. 1) derailleurs feature a roller bearing clutch for damping and cage lock for easy wheel changes Exact Actuation ratio works with all SRAM mountain road 10 speed shifters Di. R. T (Direct Route Technology) for light effort shifting performance Item Specifications Color Black Weight 252 Largest Cog 36 Chain Wrap Capacity 47 Cage Length Long SRAM GX 10 Speed Rear Derailleur Rear Derailleur UPC: 710845771835