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They are strong spokes
They're strong, but they may not be stiff enough for low spoke counts on road rears. Some are fine, others not so much. There are various factors, such as rim properties, rider weight and strength, riding style and perhaps above all how much wheel flex the rider and bike will tolerate without something getting rubbed up the wrong way
gbj_tester-
I have cx rays in some of my rears. Fine in the 28h gravel wheels, but in the roadie with 24h and a fairly deep 50mm I managed to scrap the paint of the frame with a slightly misaligned (by 1-2mm) wheel doing hard sprints. At 6'2" and 68kg I'm not exactly a track sprinter, won't recommend to anyone bigger.
Netakure
I have some wheels wich are completely laced with cx-ray, so unfortunately I can't tell about cx sprints. I weigh 73 kg and so far , I've ridden rear wheels with 24, 20 and even 16 spokes. I built a 16 spokes rear wheel from an old GPM Tecno rim to DT Swiss track hub with Cx-Rays for a friend who weighs approx. 100 kg and it hasn't exploded under him yet. They are strong spokes.