Been riding with a friend for 30+ years, he's heavy but not obese with powerful legs and tends to crunch big gears, he's hard on bikes. He's broken several frames over the years but the only broken CF frame was the result of hitting a tree though he was able to ride it out of the woods. He once broke an aluminum rear triangle of a mtn bike with a CF main frame.
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Two wrongs don't make a right but three lefts do! Unknown