e*thirteen Helix Race Cassette - 12-Speed, 9-50t, Intergalactic

The e*thirteen Helix R 12-speed cassette is an upgrade to any SRAM‚Ñ¢ Eagle or Shimano‚Ñ¢ 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. PVD finish for improved durability. 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.