I'm in a dilemma here; I have a friend who has had DBS and wants to cycle. He bought a two wheel bicycle after a test run on an unused car park where he was quite safe. However, on his first cycle, he fell off twice into the road which fortunately did not result in a serious injury. Intuitively, after this experience I feel that cycling for him is not a good idea. What are others experiences/opinions trying to cycle after undergoing DBS?