Shimano CUES RD-U4020-SGS Rear Derailleur Description: Make cycling an essential part of your fitness lifestyle with the Shimano CUES RD-U4020 Shadow 2x9-speed rear derailleur. Designed for daily riding dependability, its smooth and decisive rear shifting will keep you moving around town and into the countryside. Features: Stable drivetrain performance on trails, gravel, and city streets Shadow low-profile design protects rear derailleur from obstacles in a wide variety of riding scenes Designed and tested to provide enduring e-biking performance 11t pulley wheels Compatible with LINKGLIDE AND HG 11-speed chains