SHIMANO ACERA M340 REAR MECH

Acera mountain bike rear derailleur featuring advanced technology for a wide gear choice
Megapulley system uses oversize 15-tooth tension pulley and 13-tooth guide pulley to reduce noise and wear
SmartCage short pulley cage offers larger gearing capacity that accommodates MegaRange super-low gear and gives good ground clearance
Extension spring and low-friction fluorine-coated link pivot bushings result in a light shifting action
IG and HG chain, 7- and 8-speed compatible