The Shimano RD-M3020 Acera Rear Derailleur SGS is designed for reliable shifting performance on 8-speed drivetrains. Its long cage (SGS) accommodates a wide gear range, ensuring smooth and precise chain movement on varied terrain. Built with durability and Shimanos proven technology, this derailleur offers consistent, expert-level control for riders seeking dependable gear changes on their mountain or hybrid bikes. Its robust construction and efficient design optimize drivetrain performance while minimizing maintenance needs.