Shimano Ultegra RD-RX800 Rear Derailleur (Black) (11 Speed) (Medium Cage) (GS) (Shadow Plus)

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Shimano Ultegra RD-RX800 Rear Derailleur (Black) (11 Speed) (Medium Cage) (GS)
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The Shimano Ultegra RX800 GS 11-speed derailleur is the sister derailleur to the Ultegra R8000 derailleur, but features a "clutch," or what Shimano calls Shadow RD Plus technology. This is designed to reduce chain slap, noise and improve chain retention on bumpy section of riding surface. It is ideally suited to cyclocross, gravel and adventure riding. With its GS long cage, the derailleur is compatible with up to a 34 tooth cog. The smooth and quick shift performance punches above its weight class.  


  • Pulley maintains consistent distance to cassette for increased shift stability
  • Smooth, compact appearance thanks to Shadow technology
  • Stable shifting performance
  • On/Off switch for integrated clutch 

Speed: 11 Speed
Shifter Compatibility: Shimano Road (11 Speed)
Shift Mechanism: Cable Actuated
Max. Tooth: 34T
Min. Tooth: 11T
Chain Wrap Capacity: 39T
Cage Material: Aluminum
Chain Retention: Shadow Plus
Color: Black
Weight: 248g

This product was added to our catalog on June 14, 2018

Verified Owner
Saturday, May 20 2023 (about a year ago)
Shimano Ultegra RD-RX800 Rear Derailleur (Black) (11 Speed) (Medium Cage) (GS)
The clutch reduces chain slap so this is a must for use on gravel. Remember to disengage the clutch to remove the rear wheel.