The Helix R 12-Speed 9-45T cassette extends legendary Helix shift performance and cross compatibility with SRAM™ and Shimano™ 12-speed drivetrains, to the light weight Gravel and XC marketplace.

• Weighing in at a svelte 319g, this light weight engineering marvel offers an industry leading 500% gear ratio, due to e*thriteen's exclusive 9T highest gear cog.
• Our 9T cog also also lets you step down one chainring size, while keeping the same top end gearing, meaning both better ground clearance and an overall lighter drivetrain.
• Helix Cassettes were engineered with improved reliability of steel and aluminum assembly, and the 38-45T alloy cluster is easily replaceable so riders can keep their steel cluster for multiple seasons and freshen up the granny as needed without buying a whole new cassette.
• Futureproof your bike, save weight, add gear range and spice things up with a touch of color with e*thirteen Helix-R cassettes.

**Not recommended for ebike use. For ebike applications we recommend our TRS+ e*spec or Helix Plus cassettes.**