SRAM XPLR XG-1251 Cassette - 12-Speed 10-44t Silver For XDR Driver Body D1Make that daily ride from your front door a little spicier with some dirt. The 440% range of the SRAM XPLR XG 1251 cassette provides smooth gear progression when youre sweating up gravel climbs and tight jumps on the high end for when its time to drill it on asphalt. Shift features on each cog are optimized for electronic shifting so youll get fast smooth and precise shifts every time. X Range gearing gives you more range and a smoother gear