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Old 12-24-18, 11:15 AM
  #32  
jlaw
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Bikes: 2015 Spec. AWOL Elite, 2007 Spec. Roubaix Elite, 2003 Spec. Big Hit 2, 1998 VooDoo Zobop, 1985 Trek 410, 1984 Trek 620 1985 Trek 620

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This is part of the reason why highway bridges are inspected at least every 2 years - looks like it could be a fatigue failure - possibly combined with older damage (pedal strike, crash, etc.)

If you inspect the cranks you may or may not see small cracks that are forming. If you have shiny/anodized crank a bit of powdered graphite rubbed onto the crank might help highlight cracks (light-colored baby powder for black cranks). Removing the cranks and using a bright light at a low angle will help.

It's hard to know how much use older components have seen, but it is safe to assume high mileage and try to anticipate problems like this. But there is only so much you can do.

Glad to here no injuries resulted.
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