microSHIFT XCD Rear Derailleur - 11-Speed Medium Cage Black With ClutchmicroSHIFT XCD Rear Derailleur 11 Speed Medium Cage Black With Clutch. XCD rear derailleurs are compatible with Shimano mountain shifters and wide range cassettes. CNC machined rigid construction partnered with enhanced chain stability allow you to power up and down through a variety of terrains. Compatible with wide range cassettes Strong spring tension for enhanced chain stability Clutch mechanism can be turned on to maintain chain tension or off to