Shimano GRX REAR DERAILLEUR 12s (FOR 11-34/36T)
Rear Derailleur
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] AI-extracted, not yet checked against a named source (added 2 Mar 2026): Front Speeds
- [2] bike.shimano.com, checked 29 Sep 2026: Max Cog (T)
Offers
| Merchant | Base | Shipping | Availability | Total | Buy |
|---|---|---|---|---|---|
 | £89.99 | +FREE s/h | In Stock | £89.99 | Buy |
 | £109.00 | +FREE s/h | In Stock | £109.00 | Buy |
 | £109.00 | +FREE s/h | Out of Stock | £109.00 | Buy |
Price history
Recorded when a retailer's price changes; each line holds until the next change.
- Tredz
- Merlin Cycles
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.
RecommendedShimano
GRX DUAL CONTROL LEVER 2X12s RX820 (Left)
- Ships in the GRX RX820 Groupset
RecommendedShimano
GRX DUAL CONTROL LEVER 2X12s RX820 (Right)
- Ships in the GRX RX820 Groupset
RecommendedShimano
GRX FRONT DERAILLEUR 2X12s
- Ships in the GRX RX820 Groupset
RecommendedShimano
GRX CRANKSET 2X12s RX820
- Ships in the GRX RX820 Groupset
RecommendedShimano
ULTEGRA HYPERGLIDE+ CASSETTE 12s (CS-R8100-12)
- Ships in the GRX RX820 Groupset
RecommendedShimano
CN-M8100 HYPERGLIDE+ CHAIN 12s
- Ships in the GRX RX820 Groupset
RecommendedShimano
GRX - FLAT MOUNT - FRONT BRAKE CALIPER
- Ships in the GRX RX820 Groupset
RecommendedShimano
GRX - FLAT MOUNT - REAR BRAKE CALIPER
- Ships in the GRX RX820 Groupset
Shifters that drive this derailleur5
RecommendedShimano
GRX DUAL CONTROL LEVER 2X12s RX820 (Right)
- Both are 12-speed
- Both use cable actuation
Mechanically compatibleShimano
105 DUAL CONTROL LEVER 2X12s (Right)
- Both are 12-speed
- Both use cable actuation
Mechanically compatibleShimano
GRX DUAL CONTROL LEVER 2X12s RX610 (Right)
- Both are 12-speed
- Both use cable actuation
Mechanically compatibleShimano
SATELLITE SHIFTER DROPS
- Both are 12-speed
- Both use cable actuation
Mechanically compatibleShimano
SATELLITE SHIFTER TOPS
- Both are 12-speed
- Both use cable actuation
Cassettes for this derailleur7
Shares a standardShimano
105 HG CASSETTE 12s
- Both are 12-speed
- Both are Shimano drivetrain parts
Shares a standardShimano
DEORE HYPERGLIDE+ CASSETTE 12s
- Both are 12-speed
- Both are Shimano drivetrain parts
Shares a standardShimano
DEORE HYPERGLIDE+ CASSETTE 12s
- Both are 12-speed
- Both are Shimano drivetrain parts
Shares a standardShimano
DURA-ACE HYPERGLIDE+ CASSETTE 12s
- Both are 12-speed
- Both are Shimano drivetrain parts
Shares a standardShimano
HG CASSETTE 12s
- Both are 12-speed
- Both are Shimano drivetrain parts
Shares a standardShimano
ULTEGRA HYPERGLIDE+ CASSETTE 12s (CS-R8100-12)
- Both are 12-speed
- Both are Shimano drivetrain parts
Shares a standardShimano
ULTEGRA HYPERGLIDE+ CASSETTE 12s (CS-R8101-12)
- Both are 12-speed
- Both are Shimano drivetrain parts
Chains for this derailleur11
Shares a standardShimano
CN-M6100 HYPERGLIDE+ CHAIN 12s
- Both are 12-speed
Shares a standardShimano
CN-M7100 HYPERGLIDE+ CHAIN 12s
- Both are 12-speed
Shares a standardShimano
CN-M8100 HYPERGLIDE+ CHAIN 12s
- Both are 12-speed
Shares a standardShimano
CN-M9100 HYPERGLIDE+ CHAIN 12s
- Both are 12-speed
Shares a standardKMC
DLC 12
- Both are 12-speed
Shares a standardKMC
e12
- Both are 12-speed
Shares a standardFSA
K-FORCE LIGHT MTB 12 SPEED CHAIN
- Both are 12-speed
Shares a standardKMC
WAX DLC 12
- Both are 12-speed
Shares a standardKMC
WAX TT 12
- Both are 12-speed
Shares a standardKMC
WAX X12
- Both are 12-speed
Shares a standardKMC
X12
- Both are 12-speed
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.