6.25in.

NEW SRAM XPLR XG-1251 Cassette- 10/44t- 12 Speed- Rival XDR Make 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 you’re sweating up gravel climbs, and tight jumps on the high end for when it’s time to drill it on asphalt. Shift features on each cog are optimized for electronic shifting, so you’ll get fast, smooth and precise shifts every time.X-Range gearing gives you more range and a smoother gear progression, so you’re always in the right gear440% range gives the coverage 1x gravel riders wantFor use with XPLR 1x rear derailleursCompatible with Flattop chainsCompatible with XDR driver bodyMINI CLUSTER technology for light weight and durability