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Shimano GRX Di2 RD-RX817 1×11-speed Rear Derailleur

Product codeIRDRX817
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Shimano GRX Di2 RD-RX817 1×11-speed Rear Derailleur

Based on the technology introduced by SHIMANO with the RX rear derailleurs, the GRX Di2 RD-RX817 1×11-speed rear derailleur is characterised by quiet, smooth, precise and reliable shifting, even in the most demanding terrain, thanks mainly to the SHADOW RD+ chain stabilisation system.

For gravel, road and cyclocross use: Shimano Di2 GRX 1×11-speed Rear Derailleur RD-RX817

It prevents the chain from hitting and unnecessary movements of the rear derailleur cage, thus ensuring uninterrupted switching performance. In total, the GRX family offers five rear derailleurs, which are used depending on the selection of the cassette and the shift system. The rear derailleurs with short cage (Di2: RD-RX815; mechanical: RD-RX810) are used for 11-30T or 11-34T cassettes at ULTEGRA, 105 or TIAGRA level. If you use the 11-40T or 11-42T DEORE XT, SLX or DEORE groups, you will need the long cage rear derailleurs (Di2: RD-RX817; mechanical: RD-RX812), both of which have a specific lever-operated ratio for the road bike. Finally, in a 10-speed setup, SHIMANO’s HG500-10 cassettes (11-32T, 11-34T, 11-36T) with the RD-RX400 rear derailleur are used.

SHIMANO’s GRX, the first Gravel-specific component family designed for both fast progress and safe bike handling on loose surfaces, is the result of an intensive and extensive research, testing and development process that incorporates information and feedback from countless riders on trails, forest tracks, gravel tracks and asphalt all over the world.

Features – GRX Di2 RD-RX817 1×11-speed Rear Derailleur SHADOW RD+

  • Adjustable chain stabilizer prevents chain slapping and drops
  • Switch stabilizer ON/OFF to match the terrain
  • Gravel-tuned clutch tension
  • Silent and uninterrupted rear shifting on rough terrain
  • Smooth and reliable mixed surface shifting
  • Compatible with current road DUAL CONTROL LEVER

Product features

  • Use: Gravel, Road, Cyclocross
  • Group: GRX Di2
  • Model: RD-RX817
  • Mount Type: Direct Mount
  • Gear front: 1-speed
  • Gear rear: 11-speed
  • Compatible Chain: HG-EV 11-speed, HG-X11
  • Max. teeth large sprocket: 42T
  • Min. teeth large sprocket: 40T
  • Max. teeth small sprocket: 11T
  • Min. teeth small sprocket: 11T
  • Total Capacity: 41T
  • Master unit: No
  • Firmware update by E-tube Project: Yes
  • E-tube port (pcs): 1
  • E-tube connector (pcs): 0


  • Aluminum
  • GFRP


  • 322g (manufacturer information)

Scope of delivery

  • 1 GRX 11-speed Rear Derailleur Di2 RD-RX817


Shimano Shadow RD+ 
Less distraction quiet drive train. Rear Derailleur Stabilizer reduces chain slap. Simple solution for chain drop. Lighter and more efficient than roller type chain device.

The SEIS innovative shift technology is still based on the SHIMANO INDEX SYSTEM (SIS) that has proved its superior gear changing characteristics over the years. The big difference is that in this case, the shifting action is provided for by electronics instead of mechanics. This electronic shifting system has been extensively tested over past two years by several professional riders in all conditions possible, such as rain, mud, low temperatures, cobble stone roads and combinations of all of these at the same time. Shifting is executed by simply pressing the button. No power is needed to shift, which gives important advantages since it is easier now to always keep a tight grip on the handlebar and to keep your concentration on riding instead on shifting. The shift system allows accurate and effortless shifting in difficult circumstances like when you have cold hands or when you are completely exhausted. Furthermore, the shifting performance will never be affected by contaminated or stretched cables since the shifting signal is transferred electronically. The operating buttons work similarly to mechanical Dual Control Levers so you don’t need to re-program your mind for a new system.

E-Tube platform offers optimum flexibility on your bike. E-TUBE transmits interactive signals and power supply to each parts by “Plug & play” connection. E-TUBE is no rust, no stretch, no freeze and it ensures advanced low maintenance. And SM-PCE1 connects between PC and components to update firmware. Digital device stay the latest version with updating firmware for improve function.

Derailleur Mounting

Gear Range

Rear Derailleur Pulley Cage




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