Est. 1982

Shimano GRX RD-R400 10-Speed Rear Derailleur / 30-36t


The Shimano GRX RD-RX400 rear derailleur is designed for smooth, consistent rear derailleur shifting on rough terrain.

Thanks to Shimano Shadow RD+ technology with on/off stabilizer, you don't have to worry about chain slaps or drops. The RD-RX400 is compatible with all current Shimano 10-speed STIs and with 10-speed cassettes up to 11-36.


  • Adjustable chain stabilizer prevents chain slapping and drops
  • Switch stabilizer ON/OFF to match the terrain
  • Gravel-tuned clutch tension
  • Silent and uninterrupted rear shifting on rough terrain
  • Smooth and reliable mixed surface shifting
  • Compatible with current road DUAL CONTROL LEVER