Shimano RD-M3020 Acera rear derailleur SGS black 8 speed

From Shimano:

• 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

• Colour: Black
• Speed: 7 Speed
• Speed: 8 Speed