My 2¢ worth,
Biker man, in agreement with those that suggest JUST DON'T DO IT! DONT ride without either of your hands on your handlebars. At least keep one on, just in case.
(Even if you can ride with NO hand)
My Story: In my youth I was riding my Peugeot U-O8 10-speed, as I had hundreds of times, no hands. Not sure whatever happened on that one occasion… I was riding along smoothly in my home community and the next thing I knew I woke up in the hospital. A concussion, and 2 broken teeth, one of which, a bottom tooth, had going through my upper lip, requiring 6 stitches. To consider how hard I hit, try to get any of your lower teeth anywhere near your upper lip! Once was enough for me. One of my incisor teeth was filed flat on the concrete surface I was apparently catapulted onto face first before I could raise my hands, another tooth was split almost in half.
But I learned a lesson. From that day when I was 16 or 17 years old, I have NEVER ridden a bike without at least one hand on my handlebars since then.
OK, all no hands riders can now tell their stories of how they rode a round-trip of six countries with no hands. More power to you, but it is no longer worth the risk for me. When I see others do it, I just think back to that time waking up in the hospital. No thanks!