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Helix R 12-Speed Gravel Cassette


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.

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Product Spec


Works flawlessly with Shimano™ and SRAM™ 12s drivetrains*, despite the challenges in designing for the different cog spacing and chain behavior.

Additionally, if your wheel has a SRAM™ XD™ Driver and you want to upgrade to Shimano™ 12s, you not only save money on the cassette and don’t have to spend the extra on a new hub driver.

*All e*thirteen cassettes require XD drivers for mounting

Please reference our hub compatibility article to ensure the e*thirteen cassette will work on the hub you have before purchase.

Freehub Mount
XD™ and XDR™ Drivers Only
2 aluminum cogs, 10 steel cogs. PVD finishing on Intergalactic model improves durability and wear life.
12 Speed
310 Grams

Tech Info

User manual
Frequently Asked Questions

Guaranteed to be free from defects in materials or workmanship for 5 years after original purchase