At the extreme today, on pickups that are meant to never drive off roads, you see something like 22" wheels with 35-series-or-lower tires, so it looks like there's just a strip of rubber about 1" thick around the enormous rim.
[img width=500 height=280.994]https://i.ytimg.com/vi/cz8HiMRpI6k/maxresdefault.jpg[/img]