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Rival XPLR XG-1251 12-Speed Cassette - Bike Build

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Why We Like The Rival XPLR XG-1251 12-Speed Cassette

With X-range gearing and a 440% range, the Rival XPLR XG-1251 12-Speed Cassette ensures we're always in the right gear and with the amount of coverage we're looking for with a 1x gravel bike. This cassette lets us spice up our ride with a little dirt, a little gravel, and a whole lot more fun. Shift features on each cog are optimized for electronic shifting so we get smooth, quick, and precise shifting no matter what.


  • Smooth gear progression from this gravel-focused cassette
  • 440% range for coverage we want with a 1x gravel grinder
  • X-Range gearing gives us more range and the right gear, always
  • XDR driver body for a lighter and more versatile drivetrain
  • Mini Cluster hybrid cassette construction for lightness and durability
  • Item #SRMD156
Cog Sizes
10 - 44t
Cog Material
Freehub Type
Manufacturer Warranty
2 years
road cycling, gravel