On the other hand, isn’t that the type of bike the original mountain bicyclists used on their way to developing purpose-built mountain bikes? If you can just get them rolling, you can bomb down hills with them.
I had my mother’s old cruiser bike from 1962 — eventually I gave it away to Bikes for the World.
I’ve got some older bikes. I ride them. Finding tires can be difficult. Displaying them is a very cool idea though. I’d display them as complete bikes. Cool look. Great find!