Originally Posted by
velomateo
That is where they tend to break, with small cracks visible at the inside of the radius of the corner. I have one that I’m monitoring at the moment, after seeing this I should probably switch it out.
I would advise that if you can see a hairline crack, the crank is toast. I did not see any cracks in mine last time I looked. Still, it failed under load (200+ pounder, large gears, accelerating away from being stopped).