The e*thirteen HELIX R 12 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
• Helix R is durable and serviceable, with replaceable gear clusters