"Weisse Luft" wrote in
message ...

I have never seen a failed Dura Ace crank.

Well then you need to see the "Wheelsmith Collection" of broken cranks, bb
spindles and axles:

One Dura Ace crank:
http://pardo.net/pardo/bike/pic/fail/FAIL-010.html

Another Dura Ace crank:
http://pardo.net/pardo/bike/pic/fail/FAIL-016.html

For more, including lots of Campy, Colnago (carbon), Cannondale and Sweet
Wings:

http://pardo.net/pardo/bike/pic/fail/000.html

Yes, bicycle parts of all makes can and do break.....