Shimano DEORE XT REAR DERAILLEUR 1X12s (RD-M8100-SGS)

Rear Derailleur

DEORE XT REAR DERAILLEUR 1X12s (RD-M8100-SGS)
Buy at Tweeks Cycles

Specifications

Manufacturer
Shimano
Name
DEORE XT REAR DERAILLEUR 1X12s (RD-M8100-SGS)
Series
M8100
MPN
RD-M8100-SGS
Groupset
Deore XT
Rear Speeds
12
Front Speeds
1[1]
Drivetrain Brand
Shimano
Shifting Type
Cable[1]
Max Cog (T)
51[2]
Cage Length
Long
Compatible Chain Standards
Shimano HG (Hyperglide), Shimano HG+ (Hyperglide+, 12s)
Weight (g)
284
Sources
  1. [1] AI-extracted, not yet checked against a named source (added 2 Mar 2026): Front Speeds, Shifting Type
  2. [2] bike.shimano.com, checked 29 Sep 2026: Max Cog (T)

Offers

  • Tweeks Cycles
    Tweeks Cycles£70.00
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  • Tredz
    Tredz£104.49
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Compatibility

Shimano DEORE XT REAR DERAILLEUR 1X12s (RD-M8100-SGS) 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.

Deore XT M8100 Groupset8

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

DEORE XT BRAKE LEVER LEFT I-SPEC EV CLAMP BANDRecommended

Shimano

DEORE XT BRAKE LEVER LEFT I-SPEC EV CLAMP BAND

  • Ships in the Deore XT M8100 Groupset
DEORE XT BRAKE LEVER RIGHT I-SPEC EV CLAMP BANDRecommended

Shimano

DEORE XT BRAKE LEVER RIGHT I-SPEC EV CLAMP BAND

  • Ships in the Deore XT M8100 Groupset
DEORE XT SHIFT LEVER RIGHT I-SPEC EV 12sRecommended

Shimano

DEORE XT SHIFT LEVER RIGHT I-SPEC EV 12s

  • Ships in the Deore XT M8100 Groupset
DEORE XT CRANKSET 52 MM CHAIN LINE 1X12sRecommended

Shimano

DEORE XT CRANKSET 52 MM CHAIN LINE 1X12s

  • Ships in the Deore XT M8100 Groupset
DEORE XT HYPERGLIDE+ CASSETTE 12s M8100Recommended

Shimano

DEORE XT HYPERGLIDE+ CASSETTE 12s M8100

  • Ships in the Deore XT M8100 Groupset
CN-M8100 HYPERGLIDE+ CHAIN 12sRecommended

Shimano

CN-M8100 HYPERGLIDE+ CHAIN 12s

  • Ships in the Deore XT M8100 Groupset
DEORE XT 2-PISTON BRAKE CALIPER M8100Recommended

Shimano

DEORE XT 2-PISTON BRAKE CALIPER M8100

  • Ships in the Deore XT M8100 Groupset
DISC BRAKE ROTOR ICE TECHNOLOGIES FREEZA (RT-MT800)Recommended

Shimano

DISC BRAKE ROTOR ICE TECHNOLOGIES FREEZA (RT-MT800)

  • Ships in the Deore XT M8100 Groupset

Cassettes for this derailleur13

DEORE XT HYPERGLIDE+ CASSETTE 12s M8100Recommended

Shimano

DEORE XT HYPERGLIDE+ CASSETTE 12s M8100

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

Shifters that drive this derailleur18

DEORE XT SHIFT LEVER RIGHT I-SPEC EV 12sRecommended

Shimano

DEORE XT SHIFT LEVER RIGHT I-SPEC EV 12s

  • Both are 12-speed
  • Both use cable actuation
DEORE XT SHIFT LEVER RIGHT12sRecommended

Shimano

DEORE XT SHIFT LEVER RIGHT12s

  • Both are 12-speed
  • Both use cable actuation
DEORE SHIFT LEVER RIGHT CLAMP BAND 12sMechanically compatible

Shimano

DEORE SHIFT LEVER RIGHT CLAMP BAND 12s

  • Both are 12-speed
  • Both use cable actuation
DEORE SHIFT LEVER RIGHT I-SPEC EV 12sMechanically compatible

Shimano

DEORE SHIFT LEVER RIGHT I-SPEC EV 12s

  • Both are 12-speed
  • Both use cable actuation
SATELLITE SHIFTER DROPSMechanically compatible

Shimano

SATELLITE SHIFTER DROPS

  • Both are 12-speed
  • Both use cable actuation
SATELLITE SHIFTER TOPSMechanically compatible

Shimano

SATELLITE SHIFTER TOPS

  • Both are 12-speed
  • Both use cable actuation
SLX SHIFT LEVER RIGHT 12sMechanically compatible

Shimano

SLX SHIFT LEVER RIGHT 12s

  • Both are 12-speed
  • Both use cable actuation
SLX SHIFT LEVER RIGHT I-SPEC EV 12sMechanically compatible

Shimano

SLX SHIFT LEVER RIGHT I-SPEC EV 12s

  • Both are 12-speed
  • Both use cable actuation
XTR SHIFT LEVER RIGHT 12sMechanically compatible

Shimano

XTR SHIFT LEVER RIGHT 12s

  • Both are 12-speed
  • Both use cable actuation
XTR SHIFT LEVER RIGHT I-SPEC EV 12sMechanically compatible

Shimano

XTR SHIFT LEVER RIGHT I-SPEC EV 12s

  • Both are 12-speed
  • Both use cable actuation
DEORE SHIFTER CLAMP BAND 12sShares a standard

Shimano

DEORE SHIFTER CLAMP BAND 12s

  • Both are 12-speed
  • Both are Shimano drivetrain parts
DEORE SHIFTER CLAMP BAND 12s SINGLE SHIFTShares a standard

Shimano

DEORE SHIFTER CLAMP BAND 12s SINGLE SHIFT

  • Both are 12-speed
  • Both are Shimano drivetrain parts
DEORE SHIFTER I-SPEC EV 12sShares a standard

Shimano

DEORE SHIFTER I-SPEC EV 12s

  • Both are 12-speed
  • Both are Shimano drivetrain parts
DEORE SHIFTER I-SPEC EV 12s SINGLE SHIFTShares a standard

Shimano

DEORE SHIFTER I-SPEC EV 12s SINGLE SHIFT

  • Both are 12-speed
  • Both are Shimano drivetrain parts
DEORE XT SHIFTER CLAMP BAND 12sShares a standard

Shimano

DEORE XT SHIFTER CLAMP BAND 12s

  • Both are 12-speed
  • Both are Shimano drivetrain parts
DEORE XT SHIFTER CLAMP BAND 12s SINGLE SHIFTShares a standard

Shimano

DEORE XT SHIFTER CLAMP BAND 12s SINGLE SHIFT

  • Both are 12-speed
  • Both are Shimano drivetrain parts
DEORE XT SHIFTER I-SPEC EV 12sShares a standard

Shimano

DEORE XT SHIFTER I-SPEC EV 12s

  • Both are 12-speed
  • Both are Shimano drivetrain parts
DEORE XT SHIFTER I-SPEC EV 12s SINGLE SHIFTShares a standard

Shimano

DEORE XT SHIFTER I-SPEC EV 12s SINGLE SHIFT

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

Frequently Asked Questions

What fits Shimano DEORE XT REAR DERAILLEUR 1X12s (RD-M8100-SGS)?

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 DEORE XT REAR DERAILLEUR 1X12s (RD-M8100-SGS)?

No. Shimano DEORE XT REAR DERAILLEUR 1X12s (RD-M8100-SGS) 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 DEORE XT REAR DERAILLEUR 1X12s (RD-M8100-SGS) work with electronic shifting like Di2 or AXS?

No. Shimano DEORE XT REAR DERAILLEUR 1X12s (RD-M8100-SGS) is mechanical, cable-actuated. Electronic groups use internal motors and proprietary signalling, so there is no mechanical or electrical path between the two.