SRAM XX1: Driven by a cutting edge, single-ring carbon crank & seamless component integration, SRAM 1X drivetrain delivers flawless chain management & faster, more precise shifting. But the relationship between XX1 components goes far beyond fitment. From the X-Horizon rear derailleur with Type 2 technology to the super wide range 11 speed 10-42T cassette, each component is designed to function synergistically with the others, achieving what no other 1X drivetrain has before.