M21 rear derailleurs are designed to work with 6- and 7-speed Shimano road and mountain shifters. Enjoy the wide variety of bikes you can get going again with M21 rear derailleurs.
- Robust composite and steel construction
- Compatible with Shimano 6- and 7-speed mountain and road systems
- Color: Black
- Rear Derailleur Mount Type: Dropout Claw Hanger
- Chain Wrap Capacity (teeth): 39
- Cage Length: Short
- Rear Der/Shifter Compatibility: Shimano Mountain
- Drivetrain Speeds: 6/7
