If you think you know how to ride a bike you are very mistaken. Try riding a bike while running on the side of wall. Pro BMX rider Tim Knoll shows off some insane stunts while on his bike as well as a skateboard. These awesome stunts are from Berlin and Barcelona. Enjoy. https://www.youtube.com/watch?v=sNnbi4oLRdcVideo can’t be loaded because JavaScript is disabled:…