I can believe it. It does seem that the larger "mono-wheels" would be marginally safer overall. But I've lately seen these one-wheel motorcycle things, whose wheel is no bigger (maybe smaller) than that of an average motorcycle. I shudder to imagine what might happen if you strike a curb or sidewalk of decent height. Would your face smite the pavement like a flyswatter? I don't know. Maybe. It's scary.There is video of somebody getting half killed on/in one of these things. Sometimes, ordinary really is safer.