Awesome sport. The skill the riders display is amazing. If you dab you have to go to a penalty box. RadBall translated from German = WheelBall. My old Montesa teammate Mike Griffitts played while he lived in Germany as a young man. He still has his bike.
I thought I had discovered a brand new sport. I guess that's a true fringe sport to have been around that long still maintain it's obscurity. It looks like a modern trials rider would take right to it.
