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
Largest Cog
32
Rear Der/Shifter Compatibility
Shimano Mountain
Rear Derailleur Mount Type
Dropout Claw Hanger
Drivetrain Speeds
7
Chain Wrap Capacity (teeth)
43
Cage Length
Long
Color
Black
Weight
316
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