SRAM GX Eagle 12-speed Rear Derailleur - 2020 Model

Item number: 78154

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SRAM GX Eagle 12-speed Rear Derailleur - 2020 Model - lunar/long
SRAM GX Eagle 12-speed Rear Derailleur - 2020 Model - lunar/long
SRAM GX Eagle 12-speed Rear Derailleur - 2020 Model - lunar/long
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You can always rely on the GX Eagle 12-speed rear derailleur by SRAM

The SRAM GX Eagle rear derailleur for Eagle 12-speed cassettes with up to 52 teeth is robust and performs smoothly and precisely in every situation. The improved cage design optimises chain guidance and allows for immediate shifting. The rear derailleur was designed for cassettes with 10-52 teeth, but is also suitable for cassettes with a gradation of 10-50 teeth.


Series: GX Eagle
Application: Cross Country, All Mountain, Enduro
Gearing: 12-speed
Mount: standard
Cassette Teeth (max.): 52 teeth
Compatibility: SRAM MTB 12-speed

Technical Information:

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


- Eagle cassettes with 10-50 teeth
- Eagle cassettes with 10-52 teeth


- revised cage architecture for optimum chain guidance
- swift, direct shifting operations
- derailleur pulley bearings made of steel
- easy mounting of chain and rear wheel thanks to Cage Lock™
- colour-coordinated with Eagle components


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

Roller Bearing Clutch™:
Rear derailleurs with Roller Bearing Clutch are equipped for rough and demanding terrain. Unimpressed by a ground full of roots, stones or rocks, the technology ensures a stable rear derailleur and prevents beating chains. The rear derailleur thus offers maximum drive stability without compromising on precision or performance.

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.

Colour Index:

lunar: dark grey

Manufacturer Part Number:



- 1 x SRAM GX 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
  • lunar/long

Customer Reviews (2)


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Customer Reviews (2)


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by Wolfgang H.  on 15.08.2020
verified purchase

Das GX Schaltwerk habe ich im Austausch für ein defektes SX Schaltwerk benutzt. Die Schaltvorgänge sind absolut super und mit der neuen Einstelllehre wahr die Einstellung ein reines KInderspiel.

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by Felix D.  on 22.06.2020

Die Gx schaltet wie gewohnt spitze und super knackig.
Das neue Gehäuse sieht im Vergleich zu der "alten" GX noch einmal deutlich hochwertiger aus, zudem funktioniert diese auch tadellos mit der 10-50 Kassette, es muss also nicht die neue 10-52 sein.
Absolutes Highlight ist aber das neue Chain-Gap-Tool, dies erleichtert die Feinjustierung immens und ist eine deutliche Verbesserung zum alten Model. So schnell habe ich meine Schaltung noch nie perfekt eingestellt.

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