Didn’t we have airless tires on our tricycles?
“Semi-pneumatic” is what they were called, but they relied on the relative rigidity of the thick sidewalls and tread to maintain their shape - they were essentially hollow, with a wire wrapped around the bead to keep them on the rim, which had to be formed around them and riveted together. Hand wagons and such had this kind of wheel and rims. When they wore out they rolled around on the rim.
Yep tricycles and grocery shopping carts have solid rubber tires, which will never go flat. I’ve always wanted such tires for cars, but figured they would never have them available.
Yes but serious bikers worry about weight. Solid rubber tires are heavy.