Shimano GRX RD-RX400 Rear Derailleur - 10-Speed Long Cage Black With Clutch

GRX RD-RX400 Rear DerailleurA Shadow RD+ chain stabilizer prevents chain slapping and dropsThe gravel-tuned clutch tension helps to provide smooth and reliable mixed surface shiftingStabilizer can be turned on/off to match terrainCompatible only with 10-speed ST-RX400 ST-4700 ST4720 ST-4725 ST-RS405 and SL-4700 shift levers