Shimano Acera RD-M3020-SGS Rear Derailleur - 7/8 Speed Long Cage Black. The Shimano Acera RD-M3020 rear derailleur features Double Servo technology to provide smooth precise shifting and helps you ride challenging terrain with fewer interruptions.Double Servo mechanism enables the rear derailleur to move in an optimum path
Versatile performance and wide compatibility
SGS Long cage
- TECH SPECS
| Color | Black |
| Rear Der/Shifter Compatibility | Shimano Mountain |
| Rear Derailleur Mount Type | 10x1 Standard |
| Drivetrain Speeds | 8 |
| Drivetrain Speeds | 7 |
| Chain Wrap Capacity (teeth) | 45 |
| keyword search | 3020 |
| Cage Length | Long |