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 deraille
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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.
| Cage Length | Short |
| Chain Wrap Capacity (teeth) | 39 |
| Color | Black |
| Drivetrain Speeds | 7 |
| Rear Der/Shifter Compatibility | Shimano Mountain |
| Rear Derailleur Mount Type | Dropout Claw Hanger |
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