Shimano GRX RX820 12 Spd Rear Derailleur

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keyboard_arrow_right Description

Shimano GRX RX820 12 Spd Rear Derailleur


The Shimano GRX RD-RX820 rear derailleur is designed with chain security and quiet, stable shifting in mind for gravel riding. The GRX RD-RX820 is compatible with 11-34T and 11-36T 12-speed cassettes and provides a wide gear range so you can find your optimal cadence on every terrain and surface type. The GRX RD-RX820 features an integrated chain stabilizer that reduces chain slap and prevents chain drops on rough terrain and can be turned off with the on/off switch when riding on smooth surfaces. Designed for smooth and reliable shifting, GRX 12-speed is ready for any ride on any surface.

Note: Cage is not interchangeable with RX822-GS and RX822-SGS derailleur cages.


  • Shadow Plus chain stabilizer (with on/off switch) prevents chain drops
  • Reliable and smooth shifting on mixed surfaces
  • Secure and silent shifting on rough terrain


  • Speed: 12 Speed
  • Shifter Compatibility: Shimano Road (12 Speed)
  • Shift Mechanism: Cable Actuated
  • Max. Tooth: 36T
  • Min. Tooth: 11T
  • Chain Wrap Capacity: 42T
  • Cage Material: Aluminum
  • Chain Retention: Shadow Plus
  • Color: Black
  • Weight: 270g

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