We must realize that in some of the toughest environments, carbon composite structures are chosen over metal. There are carbon composites used in landing gear of modern fighter jets. Compression molded parts like cranks are very tough structures. Even if a chain gouges a crank there is a great margin of safety built in. I am considering the beating my aluminum cranks have taken and realize the carbon cranks can take it and last longer than aluminum. Carbon composite structures have flex characteristics that rival steel in that they will not fail when flexed over time, unlike aluminum that has a definate failure point when flexed over time.
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