Originally Posted by
SJX426
the ramp on the tooth looks fine and the chain does not have any resistance to rotating on all the pins, but the chain tends to ride up the tooth and then pop down.
Why do you have ramps on a single speed? Maybe the wrong sprocket?
As far as riding high on the teeth, that sounds like the chain has stretched. Have you checked for chain wear?
Or, perhaps the sprocket is worn from a previously stretched chain.
As
fietsbob mentioned, it could also be the wrong chain.