Altus Rd-M310 7-8 Speed Rear Derailleur (Mech)Information Altus mountain bike rear derailleur with light action operation and over size pulleys for a wide gear choice Oversize 13 15 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
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