e*thirteen has lead the industry with its wide-range, ultra-light cassettes and today they announced a new Helix R cassette, designed to work with both SRAM™ Eagle or Shimano™ drivetrain, with a 556% range, and weighing only 345-grams. The Helix R cassette comes in 11-speed 9-46t (available December 1st, 2020), or 12-speed 9-50t (shipping October 15th), has replaceable gear clusters, comes in 5 different colors, and comes in a brilliant PVD coating ($319.90).

The Helix R starts at $289.95 for 12-speed, and 11-speed.