SRAM XX1 was developed with a special 1X drivetrain philosophy, making it simpler, lighter, and more durable than any other drivetrain. No matter where you are or what obstacles you face: SRAM XX1 is unstoppable.

Purposeful Pursuit
Based on a groundbreaking single-chainring carbon crank and seamlessly integrated components, the SRAM 1X drivetrain offers impeccable chain management and faster, more precise shifting. However, the relationship between the XX1 components goes beyond mere synchronization. From the X-HORIZON derailleur with TYPE 2 technology to the 11-speed cassette with an incredibly wide gear range of 10-42 teeth, every component is designed to work perfectly with the others to achieve what no other single-chainring drivetrain has accomplished.

XX1 Cassette
The first of its kind
With 10-42 teeth, the 11-speed X-DOME cassette offers an incredible gear range while maintaining optimal spacing. When combined with the XD freehub, it connects perfectly to the wheelset. The X-DOME technology creates an incredibly lightweight, precise, and strong cassette. The open design is less prone to dirt, ensuring cleaner shifts and longer durability. XD is a new freehub design that allows for the use of a 10-tooth cog and provides an improved coupling surface with the cassette.

Compatibility: Currently, XD freehub compatible wheel systems are available from SRAM and DT-Swiss.