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