I need new tubes for the Radwagon 4 and Radpower say that they don't know when replacement tubes are in stock. This means that my bike is currently as much use as a pile of bricks.

It seems that 22" x 3" tubes are only sold by Radpower, and seemingly only when they feel like it. So I am looking at switching to a narrower tire that will take a standard size tube.

Has anyone has success changing to a different tire? I'm thinking of the We the People Overbite 22" or S&M SPeedball.