One was at the pedal threading. Had a similar failure on a Truvativ Rouleur crank, which isn't Hollowtech.
For the other two failures are just the facts available that the cranks snapped. For the record: the cranks snapped, not the spindle.
The poster wrote that he rides trails, so it may be that the cranks had hit a rock and were scratched deeply. That may be deep enough to act as a kerf. Aluminium is very sensible to kerfs, in particular under alternating loads.
Conclusion: That post on reddit doesn't contain enough information to do a proper diagnosis of the reasons for the snapped cranks. Iow it's pointless.
E.
It's like It Is: the post says "HollowTech failures".
It doesn't matter which part of it is responsible.
My criticism was on the Light Religion that Sacrifies Safety to win a sec a mile in a race.
The part where is sacrificed, whether that is
- the axle (hollow)
- the crank (hollow)
- less material supporting the pedal eye (also possible on square taper cranksets - see the Stronglight I had, whose pedal eyes broke out one after another).
- or any combination of above
... doesn't matter.
Taking everything into account is what makes a diagnosis proper.
That's What I,
silva
From Belgium, continent Europe, planet Earth, Solar System, Milky Way, Local Group, Universe,
says.