Shimano 105 REAR DERAILLEUR 12s

Rear Derailleur

105 REAR DERAILLEUR 12s
Buy at Merlin Cycles

Specifications

Manufacturer
Shimano
Name
105 REAR DERAILLEUR 12s
Series
R7100
MPN
RD-R7100
Groupset
105
Rear Speeds
12
Front Speeds
2
Drivetrain Brand
Shimano
Shifting Type
Cable[1]
Max Cog (T)
36[2]
Compatible Chain Standards
Shimano HG (Hyperglide), Shimano HG+ (Hyperglide+, 12s)
Weight (g)
249
Sources
  1. [1] AI-extracted, not yet checked against a named source (added 10 Feb 2026): Shifting Type
  2. [2] bike.shimano.com, checked 29 Sep 2026: Max Cog (T)

Offers

  • Merlin Cycles
    Merlin Cycles£33.95
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  • Tweeks Cycles
    Tweeks Cycles£59.50
    Out of Stock
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Compatibility

Shimano 105 REAR DERAILLEUR 12s 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.

105 R7100 Mechanical Disc Groupset9

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

105 DUAL CONTROL LEVER 2X12s (Left)Recommended

Shimano

105 DUAL CONTROL LEVER 2X12s (Left)

  • Ships in the 105 R7100 Mechanical Disc Groupset
105 DUAL CONTROL LEVER 2X12s (Right)Recommended

Shimano

105 DUAL CONTROL LEVER 2X12s (Right)

  • Ships in the 105 R7100 Mechanical Disc Groupset
105 FRONT DERAILLEUR (BRAZED-ON MOUNT) 2X12sRecommended

Shimano

105 FRONT DERAILLEUR (BRAZED-ON MOUNT) 2X12s

  • Ships in the 105 R7100 Mechanical Disc Groupset
105 CRANKSET 2X12sRecommended

Shimano

105 CRANKSET 2X12s

  • Ships in the 105 R7100 Mechanical Disc Groupset
105 HG CASSETTE 12sRecommended

Shimano

105 HG CASSETTE 12s

  • Ships in the 105 R7100 Mechanical Disc Groupset
CN-M7100 HYPERGLIDE+ CHAIN 12sRecommended

Shimano

CN-M7100 HYPERGLIDE+ CHAIN 12s

  • Ships in the 105 R7100 Mechanical Disc Groupset
105 FRONT BRAKE CALIPERRecommended

Shimano

105 FRONT BRAKE CALIPER

  • Ships in the 105 R7100 Mechanical Disc Groupset
105 REAR BRAKE CALIPERRecommended

Shimano

105 REAR BRAKE CALIPER

  • Ships in the 105 R7100 Mechanical Disc Groupset
CENTER LOCK DISC BRAKE ROTOR ICE TECHNOLOGIES (SM-RT70)Recommended

Shimano

CENTER LOCK DISC BRAKE ROTOR ICE TECHNOLOGIES (SM-RT70)

  • Ships in the 105 R7100 Mechanical Disc Groupset

Frequently Asked Questions

What fits Shimano 105 REAR DERAILLEUR 12s?

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 105 REAR DERAILLEUR 12s?

No. Shimano 105 REAR DERAILLEUR 12s 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 105 REAR DERAILLEUR 12s work with electronic shifting like Di2 or AXS?

No. Shimano 105 REAR DERAILLEUR 12s is mechanical, cable-actuated. Electronic groups use internal motors and proprietary signalling, so there is no mechanical or electrical path between the two.