Stronglight cranks any good?

i have these on my bike and today on the way back from work the chainring got unstuck from the cranks. the cranks/pedals spin but the ring does not!
did anyone have the same problem? :(

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.

2 Attachments

you are right, its the one piece unit, the point that linked the cranks with the chainring broke.
i need new crankset and i will definitely go for the more expensive one that the chainring attached by bolt via spiders.
I am considering the BLB or sugino ones, but i might need to change the BB as well and that makes quite expensive repair.
The £22 stronglight sound like a bargain but is waste of money if you use them on a fixie. they are not strong enough for resistance braking.

this is what happened to me on a similar stronglight crank. the arms/ ring are so thin. I would not use them even though they are really cheap. spa cycles has them for £20.

http://www.lfgss.com/thread14421.html

i sorted it out. popped in at BLB and fitted the £70 track crankset (and new BB/chain/sprocket!) the bike rides like new now :)

PS the service from the BLB guys was excellent too, thank you.

hi
I have a new unused stronglight 99bis (drilled) along with a bottom bracket(unused) - all boxed.
Thinking of advertising it if it's of use to anyone ?