Maybe you never saw or you don't know what's a monowheel bike but this idea comes from time to time when someone claims he invented a new revolutionary bike. As this really old video shows, it's not a new idea. It's even a very old idea and if I can trust wikipedia, it's from 1860s... This old movie is from 1927. However, I alway found this idea very cool and if some day I could try one, I will. Don't you ? The problem with this kind of vehicle is if you accelerate or you brake to much you will spin in the wheel like a hamster cause this is only the gravity who keep you at the bottom. Maybe this type of vehicle could be used on Jupiter cause your weight is much bigger than on earth 🙂