Shimano GRX REAR DERAILLEUR 12s (FOR 11-34/36T)

Rear Derailleur

GRX REAR DERAILLEUR 12s (FOR 11-34/36T)

Specifications

Manufacturer
Shimano
Name
GRX REAR DERAILLEUR 12s (FOR 11-34/36T)
Series
RX820
MPN
RD-RX820
Groupset
GRX
Rear Speeds
12
Front Speeds
1[1]
Drivetrain Brand
Shimano
Shifting Type
Cable
Max Cog (T)
36[2]
Compatible Chain Standards
Shimano HG (Hyperglide), Shimano HG+ (Hyperglide+, 12s)
Weight (g)
270
Sources
  1. [1] AI-extracted, not yet checked against a named source (added 2 Mar 2026): Front Speeds
  2. [2] bike.shimano.com, checked 29 Sep 2026: Max Cog (T)

Compatibility

Shimano GRX REAR DERAILLEUR 12s (FOR 11-34/36T) is a Shimano rear derailleur. It is a 12-speed component. It uses Cable shifting. Everything listed below was matched on a specification we hold for both parts: the interface each pairing actually depends on, such as freehub body, speed count, actuation or mounting standard. Where we could not verify that interface, the part is left out rather than assumed to fit.

GRX RX820 Groupset8

A groupset is designed and tested as one system, so these are the most reliable match. Other compatible parts are listed below.

GRX DUAL CONTROL LEVER 2X12s RX820 (Left)Recommended

Shimano

GRX DUAL CONTROL LEVER 2X12s RX820 (Left)

  • Ships in the GRX RX820 Groupset
GRX DUAL CONTROL LEVER 2X12s RX820 (Right)Recommended

Shimano

GRX DUAL CONTROL LEVER 2X12s RX820 (Right)

  • Ships in the GRX RX820 Groupset
GRX FRONT DERAILLEUR 2X12sRecommended

Shimano

GRX FRONT DERAILLEUR 2X12s

  • Ships in the GRX RX820 Groupset
GRX CRANKSET 2X12s RX820Recommended

Shimano

GRX CRANKSET 2X12s RX820

  • Ships in the GRX RX820 Groupset
ULTEGRA HYPERGLIDE+ CASSETTE 12s (CS-R8100-12)Recommended

Shimano

ULTEGRA HYPERGLIDE+ CASSETTE 12s (CS-R8100-12)

  • Ships in the GRX RX820 Groupset
CN-M8100 HYPERGLIDE+ CHAIN 12sRecommended

Shimano

CN-M8100 HYPERGLIDE+ CHAIN 12s

  • Ships in the GRX RX820 Groupset
GRX - FLAT MOUNT - FRONT BRAKE CALIPERRecommended

Shimano

GRX - FLAT MOUNT - FRONT BRAKE CALIPER

  • Ships in the GRX RX820 Groupset
GRX - FLAT MOUNT - REAR BRAKE CALIPERRecommended

Shimano

GRX - FLAT MOUNT - REAR BRAKE CALIPER

  • Ships in the GRX RX820 Groupset

Frequently Asked Questions

What fits Shimano GRX REAR DERAILLEUR 12s (FOR 11-34/36T)?

On this page we list shifters that drive this derailleur, cassettes for this derailleur, chains for this derailleur. Each listing was matched on a specification we hold for both parts; anything we could not verify is omitted rather than assumed to fit.

Can I use a higher or lower speed chain with Shimano GRX REAR DERAILLEUR 12s (FOR 11-34/36T)?

No. Shimano GRX REAR DERAILLEUR 12s (FOR 11-34/36T) is a 12-speed component and needs a 12-speed chain. Chains for different speed counts have different external widths and inner-plate profiles, which causes poor shifting or interference with the neighbouring sprockets.

Does Shimano GRX REAR DERAILLEUR 12s (FOR 11-34/36T) work with electronic shifting like Di2 or AXS?

No. Shimano GRX REAR DERAILLEUR 12s (FOR 11-34/36T) is mechanical, cable-actuated. Electronic groups use internal motors and proprietary signalling, so there is no mechanical or electrical path between the two.