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
Manufacturer microSHIFT
Manufacturer Part Number RD-M21SS
UPC 4710495436388
Model microSHIFT M21 Rear Derailleur
Rear Derailleur Style Mountain
Rear Derailleur Mount Type
10x1 Standard
Rear Der/Shifter Compatibility
Shimano Mountain
Rear Der/Shifter Compatibility
Shimano Road
Cage Length
Short
Drivetrain Speeds
6
Drivetrain Speeds
7
Weight
241
Color
Black
Chain Wrap Capacity (teeth)
21
Largest Cog
32