Originally Posted by
jamesdak
My one failed frame as an adult has been carbon fiber. Rear ultegra derailleur body snapped, rotated around and sheared right through the seat stay on that side. Bet that wouldn't happen on my steel bikes.
Just sayin...

And I've broken more steel bikes than carbon. They all break.
Steel:
Cinelli at the head tube
Nishiki Comp III at the rear dropout
Nishiki Team Pro through the down tube
Eisentraut at the head tube twice and once at the seat stay cluster
Gianni Motta at the BB shell
Raleigh Comp at the BB shell
Trek 460 at the BB shell
Aluminum:
Alan CX - de-bonded at the head tube
Carbon:
Specialized Roubaix Pro - BB sleeve de-bonded.