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Shimano Ultegra RD-RX800 Rear Derailleur



The Shimano Ultegra RX RD-RX800-GS Rear Derailleur brings mountain bike technology to the road with a clutch equipped 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. Designed for use on 2x11-speed mechanical systems.


  • Weight: 248 grams
  • Chain Stabilizer mechanism adopted from MTB design
  • ON/OFF switch
  • Compatible with current road 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-RX800 Rear Derailleur