microSHIFT M21 Rear Derailleur - 67 Speed Short Cage Dropout Claw Hanger Black. 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
- TECH SPECS
|Chain Wrap Capacity (teeth)||39|
|Rear Der/Shifter Compatibility||Shimano Mountain|
|Rear Derailleur Mount Type||Dropout Claw Hanger|