About SRAM XX Eagle SL Transmission XS-1299 10-52 12 Speed Cassette
The XX SL Eagle Transmission (T-Type) Cassette is a major reason why Eagle Transmission offers the best-ever inboard and outboard shifting performance under load. Thanks to its full X-SYNC design, the harder you pedal, the better it shifts. This is the lightest Eagle cassette in history as well as SRAM's most precise and long lasting. Its new-gen features a fully machined, hardened steel X-Dome architecture for gears 1-9 and an ultra-lightweight, all-aluminum Spider Cog for gears 10-12. Engineered as integrated and interdependent transmission components, the XX Eagle Transmission Cassette and derailleur contact directly, ensuring perfect alignment on every bike. From its massive 520% gear range, the 52 tooth cog steps down with improved gear progression with 44 and 38 tooth cogs in the low end (compared to the Eagle drivetrain 10-52-tooth cassette). Featuring a clearly marked Setup Cog, install is both simple and fool-proof.

Features
New-gen design is SRAM's lightest ever 10-52T cassette due to the ultra-lightweight, all-aluminum Spider Cog

Full X-SYNC for best-ever inboard and outboard shifting performance under load

Optimized gear steps on low end

55mm chainline compatibility for more moderate chain angle, longer wear and greater precision

Setup Cog for fool-proof set up

Utilizes well accepted and broadly available XD driverbody

Specifications
Speed (CS): 12s T-Type

Gearing: 10-52t

Cog Finish (Cassette): Black

Technology (Cassette): XS

Cog Sizes 10-52t: 10,12,14,16,18,21,24,28,32,38,44,52

Weight: 350g

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.