The Shimano RD-M3020-8 Acera 7/8-Speed Rear Derailleur is a double Servo rear derailleur with smooth, precise shifting performance and wide-range capability. Double Servo technology helps you ride challenging terrain with fewer interruptions.
Features
- Double Servo construction for smooth and precise shifting
- Versatile performance and wide compatibility
- Max. low sprocket: 40T
- Total capacity: 45T
- Does not work with 11-28T drivetrains
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