Sram: The X0 Eagle Transmission (T-Type) Cassette is a major reason why Eagle Transmission offers the best-ever inboard and outboard shifting performance under load. Engineered as integrated and interdependent transmission components, the X0 Eagle Transmission Cassette and derailleur contact directly, ensuring perfect alignment on every bike. Beyond its unique and stunning Dark Polar finish and electroless nickel plating for incredible resistance to corrosion and wear, its full X-SYNC design literally means the harder you pedal, the better it shifts. Its strength is further proven by its full approval for E-MTB use. It’s been built for a 55mm chainline for even more durability and precision thanks to milder chain angles throughout the full range, low to high. 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). What else? It has a clearly marked Setup Cog, making install both simple and fool-proof. Utilizes X-DOME for gears 1-11, with a lighter-weight aluminum 12th gear. FEATURES 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 Features X-DOME with a lighter aluminum 12th gear. Fully E-MTB approved SPECIFICATIONS Speed (CS): 12s 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 Driver body interface: XD