[jcp123]

Well, on my beaters I just use whatever proper size the local used tire guy has that he can sling onto the wheel.

Side benefit, I get better service from them. Last time I went to a new guy and he patched a tire he could have replaced. He let me go down the street for change with no collateral and no promise that I wouldn't stuff him, so as I was driving, I turned around and just gave him what I'd have paid for a tire. Worth it. And I'll be going back to that guy.

So maybe my used tire thing has RR benefits? Makes sense but I'd never thought about it.