There's probably more appropriate forums to post this on, bike-centric people who might be more into this sort of stuff, but GRM is a known quantity and I feel like there's maybe a handful of folks here who might be interested in this, or possibly even helpful.
Several decades ago, when I was a boy, my brother and I used to go over to our Grandparents' house after church on Sunday. Our parents would have coffee and donuts with my dad's parents, and my brother and I would see what mischief we could get ourselves into at their house. "Me Ma and Pa", as we called them, had an assortment of ancient (even then), rusting, barely-functioning wagons, bikes, trikes, and other toys that we unsympathetically thrashed about (as kids do) and banged into each other with. Which was all great fun.
About 10 years ago Pa died (his wife predeceased him by almost 20 years, amazingly) and in cleaning out his old house, I ended up with what remained of the old rusty wheeled things we used to bang about on back in the 1980s. Having tons of other projects going on, they got stashed in my barn, hung up, covered, and forgotten.
A few weeks ago Mrs. VCH and I were talking, and she mentioned she'd like an old cruiser style bike to ride around while our kids were riding their bikes. And I remembered one of the bikes from my grandparents' stash, and suggested maybe we see if it was still rideable.
For the first time in 10 years, this saw the light of day:
I put some air into the tires, and they held...sort of. The front tire may be the original one- as in, the one that came on the bike new. It split, and went crooked, but I did pedal the bike up the driveway and back to confirm it did function. Overnight, the inner tube popped and took with it the tire. No matter, new ones were already on order...