Originally Posted by
unterhausen
I would love to get my hands on this thing and put it under a microscope. I think it's consistent with a fatigue failure from a weld defect. Maybe it saw some hard use. Makes me want to go inspect the welds on my macho macho man disc (3M)
It's true that cracking open like that is consistent with fatigue but the thing is it was practically a new bike. Fatigue failures tend to appear after after several tens of thousands of km. I think because it was such clean breaks on both tubes, exactly the same, that the wrong or a defective alloy was supplied. There's no way it should fail like that.