Shimano RDM3020 Acera Rear Derailleur SGS 8 Speed
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 Rapid-fire shifters
IG and HG chain, 7- and 8-speed compatible