Shimano GRX REAR DERAILLEUR 12s (FOR 10-51T)

Rear Derailleur

GRX REAR DERAILLEUR 12s (FOR 10-51T)
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Specifications

Manufacturer
Shimano
Name
GRX REAR DERAILLEUR 12s (FOR 10-51T)
Series
RX820
MPN
RD-RX822-SGS
Groupset
GRX
Rear Speeds
12
Drivetrain Brand
Shimano
Shifting Type
Cable
Max Cog (T)
51[1]
Cage Length
Long
Compatible Chain Standards
Shimano HG (Hyperglide), Shimano HG+ (Hyperglide+, 12s)
Weight (g)
288
Sources
  1. [1] bike.shimano.com, checked 29 Sep 2026: Max Cog (T)

Offers

  • Tweeks Cycles
    Tweeks Cycles£109.00
    Out of Stock
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Compatibility

Shimano GRX REAR DERAILLEUR 12s (FOR 10-51T) 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.

Cassettes for this derailleur13

105 HG CASSETTE 12sShares a standard

Shimano

105 HG CASSETTE 12s

  • Both are 12-speed
  • Both are Shimano drivetrain parts
DEORE HYPERGLIDE+ CASSETTE 12sShares a standard

Shimano

DEORE HYPERGLIDE+ CASSETTE 12s

  • Both are 12-speed
  • Both are Shimano drivetrain parts
DEORE HYPERGLIDE+ CASSETTE 12sShares a standard

Shimano

DEORE HYPERGLIDE+ CASSETTE 12s

  • Both are 12-speed
  • Both are Shimano drivetrain parts
DEORE HYPERGLIDE+ CASSETTE 12sShares a standard

Shimano

DEORE HYPERGLIDE+ CASSETTE 12s

  • Both are 12-speed
  • Both are Shimano drivetrain parts
DEORE XT HYPERGLIDE+ CASSETTE 12s M8100Shares a standard

Shimano

DEORE XT HYPERGLIDE+ CASSETTE 12s M8100

  • Both are 12-speed
  • Both are Shimano drivetrain parts
DEORE XT HYPERGLIDE+ CASSETTE 12s M8200Shares a standard

Shimano

DEORE XT HYPERGLIDE+ CASSETTE 12s M8200

  • Both are 12-speed
  • Both are Shimano drivetrain parts
DURA-ACE HYPERGLIDE+ CASSETTE 12s Shares a standard

Shimano

DURA-ACE HYPERGLIDE+ CASSETTE 12s

  • Both are 12-speed
  • Both are Shimano drivetrain parts
HG CASSETTE 12sShares a standard

Shimano

HG CASSETTE 12s

  • Both are 12-speed
  • Both are Shimano drivetrain parts
SLX HYPERGLIDE+ CASSETTE 12s Shares a standard

Shimano

SLX HYPERGLIDE+ CASSETTE 12s

  • Both are 12-speed
  • Both are Shimano drivetrain parts
ULTEGRA HYPERGLIDE+ CASSETTE 12s (CS-R8100-12)Shares a standard

Shimano

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

  • Both are 12-speed
  • Both are Shimano drivetrain parts
ULTEGRA HYPERGLIDE+ CASSETTE 12s (CS-R8101-12)Shares a standard

Shimano

ULTEGRA HYPERGLIDE+ CASSETTE 12s (CS-R8101-12)

  • Both are 12-speed
  • Both are Shimano drivetrain parts
XTR HYPERGLIDE+ CASSETTE 12s M9100Shares a standard

Shimano

XTR HYPERGLIDE+ CASSETTE 12s M9100

  • Both are 12-speed
  • Both are Shimano drivetrain parts
XTR HYPERGLIDE+ CASSETTE 12s M9200Shares a standard

Shimano

XTR HYPERGLIDE+ CASSETTE 12s M9200

  • Both are 12-speed
  • Both are Shimano drivetrain parts

Frequently Asked Questions

What fits Shimano GRX REAR DERAILLEUR 12s (FOR 10-51T)?

On this page we list cassettes for this derailleur, shifters that drive 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 10-51T)?

No. Shimano GRX REAR DERAILLEUR 12s (FOR 10-51T) 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 10-51T) work with electronic shifting like Di2 or AXS?

No. Shimano GRX REAR DERAILLEUR 12s (FOR 10-51T) is mechanical, cable-actuated. Electronic groups use internal motors and proprietary signalling, so there is no mechanical or electrical path between the two.