Shimano Ultegra RX Di2 RX805 Rear Derailleur (Black) (11 Speed) (Medium Cage) (GS) (Shadow Plus) (Electronic)

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Shimano Ultegra RX Di2 RX805 Rear Derailleur (Black) (11 Speed) (Medium Cage) (GS)
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Price: $299.99 (Save 17%)
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The Shimano Ultegra RX805 GS Di2 11-speed derailleur is the sister derailleur to the Ultegra R8050 Di2 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 riding surfaces. 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. With Di2, you get fast, reliable, electronic shifting that is completely customizable via the E-TUBE Project.


  • Pulley maintains consistent distance to cassette for increased shift stability
  • Low-profile, "Shadow" design
  • Stable shifting performance
  • Optimized slant angle
  • On/Off switch for integrated clutch
  • Ready to work Di2 eTube systems
  • Capable of "Synchro-Shift" 

Speed: 11 Speed
Shifter Compatibility: Shimano Di2
Shift Mechanism: Electronic (Wired)
Max. Tooth: 34T
Min. Tooth: 11T
Chain Wrap Capacity: 39T
Cage Material: Aluminum
Chain Retention: Shadow Plus
Color: Black
Weight: 280g

This product was added to our catalog on June 25, 2018

Jim Devery
Verified Owner
Friday, Dec 16 2022 (about a year ago)
Shimano Ultegra RX Di2 RX805 Rear Derailleur (Black) (11 Speed) (Medium Cage) (GS)
So far I am very happy with the RX805. I'm looking forward to better weather (Spring) to give it a complete workout.