RR MECH Acera M3020 SGS BK 8SPD Black sgs - long

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