E*thirteen Helix Race 12s Cassette - 13

Regular price £319.95
Tax included.


Helix Race | Cassette | 12 Speed | 13-52T | Bronze

Helix R 12s 13-52T Cassettes are a new close-ratio gearing design, engineered specifically to optimize cadence and shift performance under load in steep terrain with frequent climbs and gravity-powered descents. While the close-ratio concept was conceived as a game changer for e-bikes and built exceptionally strong, it's equally at home on mountain bikes and weighs in at an impressive 467g. Offering unparalleled cross-compatibility with all Shimano, Sram, and TRP 12 drivetrains, it features e*thirteen's patented 2pc construction for ease of assembly and service.


  • Close ratio gearing cassette for optimized cadence and improved shifting under load
  • Lower fatigue and extended range (Bio or Battery) with sweet spot cadence for max efficiency
  • Helix R 13-15-17-19-22-25-28-32-36-40-45-52 vs Eagle™ 10-12-14-16-18-21-24-28-32-38-44-52
  • Cross-compatibility with Shimano, SRAM, and TRP drivetrains and chains
  • Aluminum and Steel clusters can be replaced separately to reduce service cost
  • Patented two-piece aluminum/steel construction for strength, stiffness, light weight, and durability
  • Optimize cadence and shifts under loads in steep terrain, with a Helix R 13-52T close ratio gearing cassette upgrade for your e-bike or MTB.


Freehub Mount XD Driver
Type 13-52T
Material 10 Steel / 2 Alloy Cogs
Range 400%
Size 13,15,17,19,22,25,28,32,36,40,45,52
Speeds 12 spd
Weight 467g
Color Bronze
Warranty 5 Years

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