SRAM XG-1275 12s Cassette C1

The SRAM XG-1275 12s Cassette C1 is SRAM's Eagle cassette for mountain bike riders who value all-day range over anything else. It's available in two gearing options — 10-50t and 10-52t — giving riders a 500-percent or 520-percent total gear range, which means you get a wide enough spread to spin up the steepest, longest climbs and still hold a reasonable cadence on descents and fire road sections without needing a second chainring up front.

SRAM builds this cassette using FULL PIN technology: precision-engineered steel cogs permanently connected with high-strength stainless steel pins, rather than a single milled cluster. That construction keeps the cassette light while holding up to the repeated load of a 1x mountain bike drivetrain. The open design, similar to SRAM's X-DOME cassettes, improves mud clearance between the cogs, which helps keep shifting crisp when conditions get sloppy and reduces wear on the cassette over time.

This cassette runs on an XD driver body, so it's compatible with SRAM's 12-speed Eagle drivetrains, and it uses Eagle chain technology to match. The black cog finish keeps it visually at home on nearly any mountain bike build. For riders running an Eagle 12-speed drivetrain who want a durable, wide-range cassette built to handle everything from technical climbs to long days in the saddle, the XG-1275 C1 covers that range without complication.