120669: 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. 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. 

• 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
• XD Driver Body
• SRAM Model ID: CS-XS-1299-A1

120669-01:
   - SRAM, XS-1299 XX Eagle SL T-Type, Cassette, Silver/Black, Speed: 12, 10-52T