Designed for the latest electronic shifting technology, the SRAM XS-1275 GX Eagle Transmission 12-Speed Cassette is apart of SRAM new Transmission series but features a slightly more value-based GX Eagle build. This cassette is a 12-speed, 10-52-tooth cassette that features X-Sync technology for flawless shifting. The X-Sync allows us to shift under load and makes our shifting smoother than ever. The cassette has a redesigned second and third gears and now features a 38 and 44-teeth cogs for less of a jump between gears. Gears 1-8 feature a pindome design and gears 9-12 are a one-piece design for a lighter eight and more durability.