SRAM Cassette XS-1299 T-Type Eagle 10-52 12 speedThis is the lightest Eagle cassette SRAM has made, as well as, their 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