Originally Posted by cyccommute

Please quite trying to cast aspersions. Mine is not an untrained eye.



You extrapolating a whole lot from a couple of very close pictures. There is no picture of the outer face of the crank so how can you tell if the crank is an Alivio or some other generic crank. There is no picture of the crank arm from which to tell if there is a code or not.

But all that means nothing. You said



They aren’t “yawning cracks” and are nothing to worry about.



Not in the pictures I’ve seen. The teeth look pretty much the same size all the way around. Compare the teeth to the photos of chainrings I posted.




Brown did record the BCD



Granted, the chainring has a really weird BCD that is a dead end. But there is no need to replace anything…nor worry about a problem that doesn’t exist. Those are steel rings that are barely worn and don’t need to be replaced anytime soon. Those rings probably won’t need to be replaced for decades of hard use with just a modicum of care.

My objection here is the advice you are giving that this feature is a problem and needs to be addressed. It isn’t and doesn’t.