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. 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. 55mm chainline compatibility for more moderate chain angle longer wear and greater precision. Utilizes a Pindome design for gears 1-8 and a single piece mini-cluster for gears 9-12. Thanks to its full X-SYNC design the harder you pedal the better it shifts. Featuring a clearly marked Setup Cog install is both simple and foolproof