Cool things with wheels since 2006
these were called porta-walls when i bought my 1st set for a 49 oldsmobile. there was no glue involved; they were captured by the outer bead of the tire, the porta-wall being the same diameter as the tire, with part of it descending between the rim and tire. it was necessary to beat them into place with a rubber hammer whilst re-inflating.
no glue involved. the whitewall was the same inside diameter as the tire and was forced over the rim of a deflated but not dismounted tire. when re-inflated (and beaten with a rubber mallet to make it behave while doing so) it was pinched between the tire and the wheel.
I'll wager they were metal, and held in place by the hubcap.
I have these on my 1935 DeSoto - they've been on the car for at least 50 years.
Still available: https://www.ebay.com/bhp/portawalls