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Sapim's CX-Ray bladed aero spoke is the leading choice of champions. CX-Ray spokes have an aerodynamic advantage over round spokes and build into lighter, stronger wheels.
With a weight nearly 30% lighter than standard double butted spokes, you would expect to give up strength. CX-Ray spokes withstand more than 3.5 million load reversals in fatigue tests, 3x more than any spoke on the road.
CX-Ray aero spokes are produced from high-tensile 18/8 stainless steel, which is ideally suited for the rigorous demands of spokes. Even downhill racers use CX-Ray spokes because of their strength and durability.