ADVENT X Rear Derailleur 10 Speed With a raceworthy weight and the right gearing for any situation, microSHIFTs top-of-the-line ADVENT X rear derailleur delivers high-end performance without high-end headaches. By using a 10-speed chain and wide range 11-48t cassette with predictable, evenly spaced gear steps, ADVENT X allows you to find the right gear even in challenging conditions. Add in microSHIFTs proprietary ratchet-and-pawl clutch, larger pulleys with taller teeth for better chain retention, and metric adjustment hardware, and youve got everything you want and nothing you dont. Compatible with ADVENT X 10-speed drivetrains only Compatible with standard 10-speed chains Ratchet-and-pawl clutch provides chain security and can be turned on and off with a switch Metric adjustment hardware