Originally Posted by
wphamilton
It is very common, to the point of almost a sure thing if you rode a chain long enough after it stretched. The cog won't be almost gone, just deformed with shark teeth on one side.
I guess that's why I have not experienced it. When my chain starts skipping, I replace it before it starts wearing on the cogs. I've never had a freewheel or chain wheel that shows excess wear.