microSHIFT 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 cassettesStrong spring tension for enhanced chain stabilityClutch mechanism can be turned on to maintain chain tension or off to allow for easier shifting and easier wheel swapsFull aluminum lightweight construction

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