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. ONLY compatible with Shimano CUES 9-Speed LINKGLIDE shifters.ONLY compatible with Shimano CUES 9-Speed LINKGLIDE shiftersStable drivetrain performance on trails, gravel, and city streetsShadow low-profile design protects rear derailleur from obstacles in a wide variety of riding scenesDesigned and tested to provide enduring e-biking performance11t pulley wheelsCompatible with LINKGLIDE AND HG 11-speed chains