Just to qualify this particular wheel After investigation was discovered to be a hand me down from a sponsored team to the team where it broke, it was IIRC a magnesium Race wheel & had been crashed a few times & NEVER x-ray/dye checked. That’s why cheap secondhand race wheels should be avoided & magnesium ones never used on the road as there are prone Stress fractures. And on broken spoke on a marginally strong wheel is all it takes to overload the rest !