SHIMANO Acera 8sp Rear Derailleur

Acera mountain bike rear derailleur with light action operation and over-size pulleys for a wide gear choice. • Oversize 13-tooth tension and guide pulleys to reduce noise and wear • Extension spring and low-friction fluorine-coated link pivot bushing result in a light shifting action • Top normal spring for use with Rapidfire shifters • IG and HG chain, 7- and 8-speed compatible • For use with 28 to 34 tooth low rear sprockets, total capacity 43 teeth