Aero spokes (Sapim CX-Ray)

Sapim aero spokes not only give an aerodynamic edge, they also make wheels lighter and stronger.

As light as titanium spokes, CX-Ray still receives one of the best results in fatigue testing.

Its unique strength and flexibility make the CX-Ray suitable for hard riding wheelsets. Even downhillers use them, recognizing their strength and flexibility. That is why Irwin equips CX-Ray as standard spoke on our wheelsets.

  • More long lasting than any other spokes on the market. Extremely high fatigue test results.
  • Special alloy treatment and sophisticated production.
  • The best aerodynamic spoke available.
  • Produced from high-tensile, fatigue-resistant 18/8 stainless steel conforming to the Sapim quality standard specifications.


Race spoke is Sapim’s most popular double butted spoke of Sapim. It is easy to reach desired build up tension level.

Sapim butted spokes have two major benefits: less weight and more strength.

Technological advances use cold forging to ‘stretch’ the spoke, retaining the linear molecular structure of the material, thereby increasing the spoke strength at the middle by at least 48%.

As an added bonus, the Race spoke’s thinner mid-section than non butted spokes provide better shock absorption.

The strength, with its extra material in the bend, makes it ideally suited for our heavy duty applications.