SRAM X01 11-SPEED REAR DERAILLEUR INNER CAGE/PULLEY KITGENUINE SRAM PARTSLuckily, many of the parts on your bike can easily be replaced if something happens. Make sure that you use genuine SRAM parts with your SRAM components. The SRAM X01 11-Speed Rear Derailleur Inner Cage/Pulley Kit is designed for the X01 and X1 11-Speed X-SYNC rear derailleurs. Features Designed for the SRAM X01 and X1 11-Speed X-SYNC rear derailleurs SRAM Part Number: 11. 7518. 030. 000 | Sram | X01 11 Speed Rear Derailleur Inner Cage/pulley Kit X01, 11 Speed