E-Thirteen Helix 12 Speed Upper Sprocket Cassette Race Cluster 42-50T Grey


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1 in stock
Shipping Weight
450 g

E*thirteen Helix Race - Replacement Upper Gear Cluster

The HELIX R 12 Speed sprocket is an upgrade to any SRAM Eagle or Shimano drivetrain.

  • Model: FW2URA-103
  • Colour: Grey
  • Size - 42 - 50T
  • Teeth - 42 - 50T
  • Speed - 12 Speed
  • Weight - 345g
  • Material - Alloy
  • Series - Helix

Featuring the most range and lowest weight of any cassette on the market.

Both the Helix R 11 and 12-Speed sprocket work flawlessly with Shimano and SRAM 12s drivetrains, despite the challenges in designing for the different cog spacing and chain behaviour.

The improved performance of e*thirteen's new Helix cassette features great Shimano 12s shifting performance and improved reliability of steel and aluminum assembly. The new Intergalactic PVD finishing is twice as durable as anodized models.

What is Helix?
It’s in our DNA to solve problems. Helix components are engineered to bridge the compatibility gap between SRAM™ and Shimano™ components, ensuring versatility and flawless performance. Future-proof your bike with e*thirteen Helix.

Service and Tech Support
Unlike SRAM Eagle™, Helix R cassettes have replaceable gear clusters (please contact manufacturer for further information). That means ongoing service and replacement costs will be less than half that of SRAM™ cassettes.

Product Attributes
Part Number

e*thirteen components are a small, rider-owned and operated company which was founded in 2001 by Dave Weagle.

Since its inception e.thirteen have always pushed peoples ideas in terms of innovation, function and design and have become a market leader in chain retention systems the world over.

e.thirteen have strong roots in competition and they support numerous athletes and events the world over from grassroots racing right up to top flight World Cup competition and World Champions, in fact e.thirteen chain guides and rings have collected more gold medals at World Cup and World Championship competition level in recent years than any other chain retention system, making them the choice for all riders at all levels.

Whatever components you need to enhance your drivetrain, e.thirteen parts will ensure your next ride is epic.