Where would these get used?
My 12" Mobiky has a terminally flexy stem and weighs 35lbs . Shear novelty, not very usefull, but makes even Brommie riders laugh.
Smaller wheels than that seems skateboard like and would need glassy smooth road
12" is really pushing it on real world streets, to me
Smaller stuff looks clever, but again where do they get used? Big parking lots? Pit bikes?
Seems like walking would be easier