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GreatSince78
@crossedthread
Had exactly the same sounding issue, a lonnnnng time ago on a brand new Cannondale. Nasty cracking sound, bolts loosening, really annoying. Cannondale mechs at a bike meet offered to swap the cranks out and - problem instantly solved. The tiny amount of damage on the splines where they weren't precisely compatible with the BB was the culprit, as they couldn't meet-up snuggly when tightened in.