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-sp