Shimano RD-M3020 Acera Rear Derailleur SGS

Key Features:Acera mountain bike rear derailleur with light action operation and over-size pulleys for a wide gear choiceOversize 13-tooth tension and guide pulleys to reduce noise and wearExtension spring and low-friction fluorine-coated link pivot bushing result in a light shifting actionTop normal spring for use with Rapidfire shiftersIG and HG chain, 7- and 8-speed compatible