MicroSHIFT Rear Derailleur Cover Set Switch And CapComing In ClutchMany of the parts on your rear derailleur are replaceable just in case something happens. The MicroSHIFT Rear Derailleur Cover Set Switch and Cap allows you to service MicroSHIFT clutch rear derailleurs by replacing the engagement teeth or tension assembly as needed. This part works with M865M, Advent, and Advent X rear derailleurs. FeaturesAllows you to service MicroSHIFT clutch rear derailleurs by replacing the engagement teeth or tension assembly as neededWorks with M865M, Advent, and Advent X rear derailleursManufacturer's part number: Y-RD303 | Microshift | Rear Der Cover Set Switch And Cap M865M, ADVENT, and ADVENT X Rear Derailleurs