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microSHIFT M21 Rear Derailleur - 67 Speed Super Short Cage 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 com
microSHIFT M21 Rear Derailleur – 67 Speed Super Short Cage 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.
| Rear Derailleur Mount Type | 10×1 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 |
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