Except for bike shares and cruisers, I really don't recall experience of riding flat pedals on a road ride. What exactly is it like or is it a lot more difficult though to spin 110 rpm on flats? I would think that the rpm speed, which inherently means less weight on the pedals (vs. 80-90 rpm e.g.) might be a more iffy proposition. But this is an unscientifically based theory.