[Dilbert San Diego]

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.

[Flick Lives]

They have airless-tires in development for cars, but they are pretty odd looking.

[Gman]

Weight issues when you get to car sized tires.

[itsahoot]

shopping carts have solid rubber tires, which will never go flat

Of course they do only just in spots. Boogity, boogity, boogity.