Thanks for the shared photos and the links! I’ve learned a lot.
The Luescher video of a sectioned Campy SR cranks was interesting from a composites fabrication standpoint! (His discussion of the mechanical attributes was a bit shallow.) Noticed in the picture that the pedal eye is actually a well done junction, at least from the standpoint of stress dissipation, using a 45 degree angle between the threaded insert and the carbon “housing”, metal-metal interface notwithstanding. (
http://pardo.net/bike/pic/mobi/d.ped...int/index.html)
I found a few more examples and discussions of crank designs and failure modes here:
http://pardo.net/bike/pic/mobi/
and here:
http://pardo.net/bike/pic/fail-001/000.html
where the Hollowtech II style spindle failures also appear… The Campy carbon cranks in PowerTorque and Ultratorque formats have their own design issues…
Wonder if it might be useful to have a sticky thread on various equipment failures to learn / improve?..