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 Road |
| Rear Derailleur Mount Type | 10x1 Standard |
| Drivetrain Speeds | 7 |
| Chain Wrap Capacity (teeth) | 21 |
| Cage Length | Short |
| Color | Black |
| Weight | 241 |
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$19.99 | $24.99
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$19.99 | $24.99
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$19.99 | $24.99
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