Shimano GRX RD-RX400 Rear Derailleur (Black) (10 Speed) (Long Cage) (Shadow Plus)

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The Shimano GRX FD-RX400 rear derailleur features an integrated chain stabilizer to keep the shifting smooth and precise over a variety of terrain.


  • Adjustable chain stabilizer prevents chain slapping and drops
  • Switch stabilizer ON/OFF to match the terrain
  • Gravel-tuned clutch tension
  • Compatible only with 10-speed GRX 400 and Tiagra 4700 (not compatible with any other shifters)

Speed: 10 Speed
Shifter Compatibility: Shimano GRX 400, Tiagra 4700 (10 Speed)
Shift Mechanism: Cable Actuated
Max. Tooth: 36T
Min. Tooth: 11T
Chain Wrap Capacity: 41T
Cage Material: Carbon/Aluminum
Chain Retention: Shadow Plus
Color: Black
Weight: 303g

This product was added to our catalog on August 26, 2019

Peter Galbraith
Verified Owner
Monday, Nov 15 2021 (about 2 years ago)
Shimano GRX RD-RX400 Rear Derailleur (Black) (10 Speed) (Long Cage)
This rear derailleur works fine with Tiagra 4700 brifters and also the Tiagra 50t -32t crank chainrings. It is even possible to leave extra chain links to accommodate a future max. 36t cassette if you have a 34t max. cassette.