When I said rolling off the rim I did not mean they are completely separating where they roll off from the plane. They are usually just rolling off one side of the rim. This to me is still described as a roll off. In 4WD terms when I have done this on my 4WD besides of the colourful words that come out of my mouth it’s called a roll off.
It is basically coming off where the side of the tyre gets pinched/ gripped to the side of the rim that you bolt back up to the other half of the rim. Hope that is making some sence.