* Integral piece of X-Range gearing technology and AXS drivetrains. Each cassette features a 10-tooth small cog and is designed specifically for wireless electronic shifting, improving shift performance.* Updated design for smoother and faster shifting* More gradual gear progression between cogs—at least five one-tooth jumps—while still offering a wider range* XDR driver body required* One-piece machined steel X-Dome design for weight savings