This is the SRAM XS-1299 XX Eagle SL T-Type Transmission Cassette.

This cassette is a major reason why Eagle Transmission provides 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 our 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, installation is both easy and fool-proof.

Features:

• New-gen design is our 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

Product Specifications:

• Speed (CS)    12
• 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
• Drivetrain Configuration    1x
• Cassette Size (Max)    52
• Cassette Size (Min)    10
• Chain Technology    T-Type
• Rear Derailleur Mount    Full Mount
• Weight (g)    350
• Weight Based On    Engineering Estimate
• Vendor Item No: 00.2418.124.000