The only bicycle I ride is in my basement, has one wheel and the handlebars move with the pedals. It's the only bike I have not fallen off, but I still hurt my knee on it. I won't ride a bicycle on the street: to slow and no respect from anyone(cars or motorcycles). I had some dumba** in a Saab tailgaiting me on the way to work this AM. Speed up or slow down and he stuck there: 2 downshifts on the TBS and I blasted away. I could not do that with pedals, so I think the motorized version is safer (for me anyway) .
Mike Sr.