RD M310 Altus Rear Derailleur

Key Features:Altus mountain bike rear derailleur with light action operation and over-size pulleys for a wide gear choiceOversize 13/15-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 compatibleFor use with 28 to 34 tooth low rear sprockets, total capacity 43 teethSGS