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	10x1 Standard
Drivetrain Speeds	7
Chain Wrap Capacity (teeth)	37
Cage Length	Short
Color	Black