E-Thirteen Helix 12 Speed Race Cassette - XD Driver - Bronze - 9-50T - 12 Speed algolia-ignore Inner bearing type IGUS LL-glide

Inner bearing type IGUS LL-glide bearing

The Topaz Air comes with a 3 position lever giving you the option to switch between three compression settings on-the-fly for climbing

Sizing Chart - See the final picture for a full sizing chart

Dimensions: All three options are the same size: 270x138mm

Wheels sold separately

E-Thirteen Helix 12 Speed Race Cassette - XD Driver - Bronze - 9-50T - 12 Speed algolia-ignore Inner bearing type IGUS LL-glideThe HELIX R Cassette is an upgrade to any SRAM Eagle or Shimano drivetrain, with more range than any other cassette on the market. 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. The improved tooth profile of the Helix cassette's features Shimano 12 speed level shifting performance with the improved reliability of a steel and