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@GA2G
How can a chainring be stuck (glued) to cranks, and therefore become unstuck? Do you mean the bolts sheared off? I've had one bolt shear off before, which put more stress on the remaining bolts. When I finally got round to replacing them all, only two bolts still were properlty secured, but the rest were ready to snap off, and had massive play. I still can't see how a chainring would even stay on, and just not fall down and rattle around the bottom bracket, if all the bolts are shorn off.
EDIT:
Apologies for not catching on quicker, but I just didn't think in terms of a one-piece unit. I think I get it now. The chainring is fixed to the crank arm as a pseudo one-piece unit, and not via a spider. So all thats happened is that the point of welding (or cold-forging, or CNC machining), has failed/broken. This would be because of a very narrow and weak contact point for the chainring to crank. You'll need a new crankset because of the nature of the failure. Better to have cranks and chainrings attached by bolts, via spiders...that way, they can be replaced independently of each other. This is my solitary opinion, and others here may have very different views.
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