Adjusting the rear derailleur on a Bicycle Shaped Object in a stand, I observed skipping gears when shifting from 6 to 5 (it skips to 4), 5 to 4 (it skips to 3), etc, but would snap in place correctly when going in the other direction.
Observing this, I then noticed that the cogset is wobbling. Maybe the hub is wobbling. And the rim is appearing to not be centered (visually, radius does not equal half-diameter) around the hub. Distance between brake pads seems fairly consistent for a BSO.
When spun softly, the wheel does not balance with the reflector down.
Is my rear wheel wobble the fault of the axle, the cogs, the bearings, or the wheel trueing? I suspect the skipping is ultimately a derailleur alignment issue, but I can't begin to work on that until I solve this.
Video of same: