That's what happens when you are gifted with legs of steel and the power of a Super Man!

What is amazing is how relatively clean the break appears to be. There had to be an issue with the piece of steel used to construct the inner body. If my father still had his mind (he has dementia), I'd love to show him these pictures. He was a metallurgist and was director of the quality control lab for an aerospace company. He looked at metal fatigue cracks under high powered microscopes for 40 years. This crack is nearly smooth and even and appears to be all in one layer.



What seems odd to me, is that this is on the inner body which carries the pawls where the break occurred. The inner body is always in motion when the wheel is spinning. The outer body transfers the human power via the pedals, cranks, chainring, chain and sprockets. While the inner body is the power transfer mechanism (drivetrain to hub to tire), there is relatively no stress where this break occurs.



Just above or outward from the break is where the outer bearing race/retaining ring is threaded onto the inner body. This part of the freewheel is basically passive, attaching the inner body to the outer body. I would think that somehow the outer bearings would all need to seize while the inner bearings continued to work just fine. The wheel would need to be completely stuck in place, while the rider exerted enough pressure on the cranks to twist and torque the inner body.

I didn't by any chance service this freewheel for you?