1, Rear derailleur: Rear derailleur (RD-U4000). 4, Full set(3PCS): Rear derailleur (RD-U4000) + Cassette (CS-LG400-9,11-41T) + Chain (CN-LG500,116L). Item: Rear derailleur. Level: Cues. 1x9-speed rear derailleur's smooth operation and dependability will help inspire riders to expand their trail-riding comfort zone.
