SRAM Eagle XX1 Drivetrain

The SRAM Eagle XX1 Drivetrain represents the pinnacle of single-ring mountain bike drivetrain engineering — a system so thoroughly developed and refined that it effectively defines what a modern 1x mountain bike drivetrain can be. At the heart of the XX1 Eagle system is the 12-speed architecture with a 10-50t cassette, providing a 520% gear range that covers every terrain scenario from steep technical climbs to fast descents without the weight, complexity, and reliability compromises of a front derailleur.

Every component in the XX1 Eagle system — from the carbon fiber crank arms to the machined aluminum cassette to the precision-engineered derailleur — has been optimized for minimum weight without compromising the structural integrity and longevity that competitive mountain bikers demand from their equipment. The result is a drivetrain that weighs significantly less than comparable alternatives while delivering superior shifting performance under load.

SRAM’s X-SYNC 2 chainring technology maintains chain retention through the roughest trail sections and the most aggressive riding styles without requiring a separate chain guide in most applications. The wide-narrow tooth profile and precise chain engagement geometry keep the drivetrain quiet and efficient even as component wear accumulates through extended hard use.

The AXS wireless electronic shifting option within the XX1 Eagle family adds wireless precision and customizable shift logic to the system’s already impressive mechanical performance. Whether in mechanical or electronic form, the SRAM Eagle XX1 Drivetrain delivers a riding experience that makes every pedal stroke feel purposeful and precise. For weight-conscious mountain bike purists, it is simply the best available.