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Looks a bit worn but I doubt it would cause the chain to skip, some of the teeth are supposed to be profiled to aid shifting.
PhilDAS-
Would the chainring be more of a likely culprit? Whatever the cause is, the slipping is happening at the cassette/ rear DR.
To clarify, it’s not skipping, rather it is slipping/jolting forward, as if the chain has slid over a tooth or the rear hub has rotated, happening when I’m applying a sudden peak in power/get out of saddle. I’ve had something similar happen when the cassette lock ring hasn’t been tightened enough, although that’s not what’s happened here.
J0nathan
On closer inspection, the cassette is (also) the culprit. Given my riding - flat, never change front chainring and only use a narrow range at the rear, this would explain a lot.
As the cassette is on Prime, I’ll see if that helps the issue.