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You don’t have to ride far on improperly installed cranks to fuck them up.
The taper gets distorted so they get tightened more but never fit properly so get loose, get tightened more, get loose, get tightened more and then crack. I’d hazard most broken square taper cranks are a result of insufficient torque on installation rather than excessive torque.
dancing james
Thanks dj, I'll probably zip it in to a bike shop for an extra tighten once it is fitted.