Shimano CUES RD-U4000 Shadow 9 Speed Rear Derailleur - Rear Derailleur - 9 Speed - BlackExpand your trail riding comfort zone with smooth operation and dependable performance This 1x9 speed rear derailleur's smooth operation and dependability will help inspire riders to expand their trail riding comfort zone. Its low profile design and chain stabilization will give them the confidence to choose rougher routes. FEATURES Stable drivetrain performance on trails, gravel, and city streets Optimized geometry and spring tension reduce chain