e*thirteen Helix R Cassette – 11-Speed 9-46t Nickel/Gray. The HELIX R Cassette is an upgrade to any SRAM Eagle or Shimano drivetrain with more range than other cassettes 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.

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