Shimano GRX RD-RX810 Rear Derailleur - 11-Speed, Long Cage, Black, With Clutch, For 1x and 2xThe Shimano GRX 11 speed rear derailleur provides silent and uninterrupted rear shifting on rough terrain. An adjustable Shimano Shadow RD+ clutch prevents chain slapping and drops. Compatible with Shimano road Dual Control Levers Gravel tuned clutch tension provides smooth and reliable mixed surface shifting Product Specifics Rear Derailleur Mount Type: Shimano Rear Direct Mount Rear Derailleur Mount Type: 10x1 Standard Rear Der Shifter