SRAM SX Eagle 12-Speed Rear Derailleur - 2021 Model

Item number: 81973
SX Eagle 12-Speed Rear Derailleur - 2021 Model - black/long
SX Eagle 12-Speed Rear Derailleur - 2021 Model - black/long
  • 100 day return period
  • Online since 1998
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The SRAM SX Eagle 12-speed Rear Derailleur - Entry point into the Eagle world

The SX Eagle rear derailleur from SRAM is equipped with a robust steel cage and is designed for 12-speed shifting. It gives cross-country, all-mountain and enduro mountain bikers an affordable entry point into single drivetrains with SRAM Eagle, and is compatible with Eagle cassettes with up to 50 teeth. Cage Lock™ allows you to remove and reattach the rear wheel in no time at all, and it also makes chain mounting easier. The X-Sync™ tooth design and the X-Horizon™ cage shape ensure optimum chain hold and precise shifting.


Series: SX Eagle
Application: Cross Country, All Mountain, Enduro
Gearing: 12-speed
Attachment: standard
Cassette Teeth (max.): 50 tooth (long)
Compatibility: SRAM MTB 12-speed

Technical Information:

Derailleur Pulleys: 14
Outer Cage Material: steel
Inner Cage Material: steel
Other Materials: steel, aluminium


- Eagle cassettes with 10-50 teeth
- Eagle cassettes with 11-50 teeth


- derailleur pulley bearings made of steel
- rear derailleur body made of aluminium, cage made of steel
- easy mounting of chain and rear wheel thanks to Cage Lock
- swift, direct shifting operations
- colour-coordinated with Eagle components


Developed specifically for 1-speed drivetrains, X-Actuation keeps shifting sharp and consistent across the entire cassette.

Cage Lock™:
Thanks to the rear derailleur's Cage-Lock technology, the chain and the rear wheel can be fitted and removed really easily. Simply release the chain tension by pushing the shift cage forward and locking it.

The parallelogram design of X-Horizon derailleurs limits movement along the horizontal axis, eliminating ghost shifting and reducing needed shifting force. The large offset of the upper shifting roller ensures a constant chain distance in every gear for faster and more precise shifting.

The X-Sync tooth design is characterised by long, rounded and slanted tooth edges with a narrow profile. Derailleur pulleys with X-Sync technology support the chain guide and remain unaffected by dust and mud.

Manufacturer Number:



- 1 x SRAM SX Eagle 12-speed rear derailleur
- 1 x SRAM chain gap adjustment gauge


in stock 2 to 7 days up to 10 days Out of stock inform me
  • black/long

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