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eThirteen Helix Race 12-speed aluminium sprockets 42-50T.

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  • The 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.
    Unlike SRAM Eagle, Helix R cassettes have replaceable gear clusters. That means ongoing service and replacement costs will be less than half that of SRAM cassettes. As an added bonus, Helix R 12s clusters are backward compatible with and can be used to upgrade your existing TRS+ 9-50 cassette.
    When installing the Helix R cassette, as with any cassette, we recommend checking chain wear. If your chain shows 0.5% or more wear, you will significantly decrease the wear life of your new cassette. Installing a new chain with your new cluster is a much better and economical solution.

    • Compatibility: Works flawlessly with Shimano and SRAM 12s drivetrains, despite the challenges in designing for the different cog spacing and chain behavior
    • Material: 2 aluminum cogs 42,50t


    http://eu.ethirteen.com/pages/helix-r-cassette

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