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  • the bottom bracket and crank are machined to fit each other grease means that the cranks will slide past the stop point causing them to exspand and crack

    You'd bust the crank bolt first. You're just not supposed to retighten the bolt after it's properly torqued, because the crank can squirm further up the taper after you've ridden it - if you tighten it then, you can crack it.

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