SRAM GX Eagle 12-Speed Rear Derailleur (Black) (Long Cage)

SRAM GX Eagle 12-Speed Rear Derailleur (Black) (Long Cage)
Price: $125.00
Discontinued Online
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This new GX derailleur not only answers the Eagle™ drivetrain’s need for greater capacity, but it’s also the next evolution of our proven, 1x-specific X-HORIZON™ design. The larger, 14-tooth X-SYNC™ lower pulley allows 10- to 50-tooth cassette, and also adds to Eagle’s overall smooth-pedaling feel. Our new, Type-3 ROLLER BEARING CLUTCH™ features a smoother torque curve for a quieter, more consistent operation and feel. CAGE LOCK™ has been moved back and out of the way, protecting it from trail debris. And a redesigned, robust mounting system further improves the Eagle™ derailleur’s performance and overall durability.

  • Mounting system and re-positioned Cage Lock offer greater durability
  • Sealed cartridge pulley bearings
  • Will not work with front derailleur drive trains
With CAGE LOCK™ technology in the rear derailleur, wheel removal and installation—as well as chain installation—becomes faster and simpler. Just pushing the cage forward to create slack and lock it into place.

ROLLER BEARING CLUTCH™ rear derailleurs deliver maximum drivetrain stability—even through the most punishing terrain. With ROLLER BEARING CLUTCH™ technology, derailleur bounce and chain slap are eliminated without sacrificing precision.

Developed specifically for SRAM 1x™, X-ACTUATION™ keeps shifting sharp and consistent across the entire cassette.

The X-HORIZON™ rear derailleur’s ‘straight parallelogram’ design limits all movement to the horizontal axis, which makes ghost shifting impossible while also reducing shift force. For quicker, more exact shifting, the large upper pulley offset design maintains a constant chain gap across all gears.


SRAM X-SYNC™ 1x chain rings provide the highest level of performance and durability. The SRAM X-SYNC™ tall square teeth edges engage the chain earlier than traditional triangle shaped teeth. The sharp and narrow tooth profile, as well as rounded chamfer edges, help manage a deflected chain. To provide the best possible performance in muddy conditions, the X-SYNC™ chain rings have been designed with mud-clearing recesses for the inner chain links and rollers. Engineered in Germany, X-SYNC™ rings are an integral part of the SRAM 1x™ drivetrain.

Speeds: 12
Material: Aluminum, Steel Pulley
Weight: 290g
Colors: Black
Outer Cage: Aluminum
Compatibility: All Levels Of Eagle™ Drivetrain Systems
Inner Cage: Aluminum
Spring: Steel
Cage Sizes: Long
Max Tooth: 50t
Pull: X-Actuation™
Technology Highlight(S): X-Horizon™, X-Actuation™, X-Sync™, Roller Bearing Clutch™, Cage Lock™
Hardware: Stainless Steel, Black

Verified Owner
Tuesday, Jul 7 2020 (8 months ago)
SRAM GX Eagle 12-Speed Rear Derailleur (Black) (Long Cage)
Upgraded from a Sram SX 12 speed. Very impressive quality very easy to setup and adjust. Comes with adjustment gauge to set the "B" screw. Smoothest shifting I have ever had. Long History with Shimano XT components. Don't think Ill be going back. Highly recommend this Derailleur.
Verified Owner
Friday, Jun 12 2020 (9 months ago)
SRAM GX Eagle 12-Speed Rear Derailleur (Black) (Long Cage)
Got a stick in the old one, never quite straight and chain kept jamming. Shifts like new again. Well worth it to replace the old.