These high-quality spokes are a direct replacement for the original Sapim CX-Ray Aero spokes that came with your FSA/ Vision wheels. This makes them ideal for riders who want to breathe new life back into their wheelset, while also benefitting from the spoke aerodynamics & performance they had when new. Genuine Vision spare parts. The CX-Ray Aero still receives one of the best results in fatigue testing of any spoke. Its unique strength & flexibility make the CX-Ray Aero suitable for most bicycle disciplines. The middle section of the spoke is drawn then pressed in a special mould to form its specific profile. CX-Ray Aero spokes are used by top bike racers & triathletes around the world. Even downhillers use them, recognising their strength & flexibility. Special alloy treatment & sophisticated production make this all possible. Manufacturer's Part Numbers: 748-S4013 Black Option 1 258mm 748-S4040 Silver Option 2 266mm