e*thirteen Helix R Cassette - 12-Speed, 9-50t, Nickel/Gray

The e*thirteen Helix R 12-speed cassette is an upgrade to any SRAM™ Eagle or Shimano™ drivetrain and offers more range than other cassette options. The 9-tooth cog lets you step down one chainring size while keeping the same top-end gearing and provides not only better ground clearance, but an overall lighter drivetrain.

Works flawlessly with Shimano and SRAM drivetrains, including electronic shift systems
CNC optimized for light weight and wide range
Helix R is durable and serviceable, with replaceable gear clusters
Engineered with improved durability of 2-part steel and aluminum assembly
XD driver compatible