About SRAM Apex Eagle D1 12 Speed Rear Derailleur
Eagle range on a drop bar bike? Now that’s a party. The Apex Eagle rear derailleur quietly and quickly shifts across SRAM's 12-speed Eagle cassettes, while 1x-specific chain retention technology keeps the chain where it needs to be. It’s the best of SRAM's road and mountain bike innovations in one package.

Features
Compatible with 50T and 52T Eagle cassettes

Works with 12-speed mechanical Apex and Eagle shifters

Use with Eagle chain

Roller Bearing Clutch controls chain tension for consistent shifting

X-HORIZON straight parallelogram design limits all movement to the horizontal axis, which makes ghost shifting impossible while also reducing shift force

Cage Lock technology makes for fast wheel changes or chain installation

Technology
Cage Lock: With CAGE LOCK technology in the rear derailleur, wheel removal and installation—as well as chain installation—becomes faster and simpler. Just push the cage forward to create slack and lock it into place.

Roller Bearing Clutch: ROLLER BEARING CLUTCH technology eliminates derailleur bounce and chain slap without sacrificing precision.

X-Horizon: This 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.

X-SYNC: SRAM X-SYNC 1x chainrings 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 chainrings 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. Accept no imitation.

Eagle: Eagle technology represents SRAM's newest 1x drivetrain technology. Eagle is a lighter, simpler, more durable, and easier to use drivetrain. Eagle features all-new 1x components, engineered for even greater durability and performance while maintaining a significant weight advantage over other drivetrain solutions. Eagle technology also provides an expanded gear range of 520%, which is equal to 2x11 drivetrains.

Specifications
Speed (RD): 12s

Cable Pull Ratio: X-actuation

Cage (RD): n/a

Max Tooth: 52

Colour (RD): Black

Pulley Bearings Material: Steel

Cage Material (RD): Aluminum

Model ID: RD-APX-152-D1

About SRAM
Founded in 1987, SRAM (an acronym of the 3 founders names, Scott, Ray and Sam) is a privately owned bicycle component manufacturer located in Chicago. They're known for developing many of the inovative technologies used in bikes today including ETAP wireless electric shifting, Grip Shift, dedicated single chain ring drivetrains, narrow wide chainrings and more. Sram also own bicycle component brands Rockshox, Quarq, Zipp and Truvativ.