Sram: The GX Eagle Transmission (T-Type) Cassette is a key 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. Designed for a 55mm chainline for less extreme chain angles throughout the full range and delivers more precision. It’s 520% range has been optimized with larger 38 and 44-teeth cogs prior to the 52-tooth cog for improved gear steps in the low end (compared to the Eagle drivetrain 10-52-tooth cassette). Featuring a clearly marked Setup Cog, install is both simple and foolproof. Plus, it utilizes a Pindome design for gears 1-8 and a single piece mini-cluster for gears 9-12.FEATURES520% range. 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 simple set up.Features a combination Pindome and MINI-CLUSTER design SPECIFICATIONSSpeed (CS) 12sGearing 10-52tCog finish (Cassette) SilverTechnology (Cassette) XSCog sizes 10-52t:10,12,14,16,18,21,24,28,32,38,44,52Driver body interface XD