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Shimano Ultegra RD-RX805 Di2 Rear Derailleur



The Shimano Ultegra RX RD-RX805-GS Di2 Rear Derailleur brings mountain bike technology to the road with a clutch equipped electronic rear derailleur for smooth shifting on rough roads. Due to the integrated Shadow RD+ Technology with its race-proven, low profile design, the derailleur is more compact and fits closer to the frame, ensuring less damage in a crash.


  • Weight: 280 grams
  • Chain Stabilizer mechanism adopted from MTB design
  • ON/OFF switch
  • Compatible with current road Di2 electronic DUAL CONTROL LEVER
  • Maximum front difference: 16T
  • Total capacity: 39T
  • Low sprocket: Maximum 34T/Minimum 28T
  • Top sprocket: Maximum 12T/Minimum 11T

Model Number
Item Code
Shimano Ultegra RD-RX805 Di2 Rear Derailleur