Originally Posted by
dutret
You have that backwards. hold your hand like you were holding flat bars of a given length. Now pretend you are holding the hoods or horns of the same length. You will see that as you rotate your hand your forearm moves out about 2-3cms on each side. So flat bars of a given width provide the leverage of horns or drops about 4-6cms narrower.
I meant on the flat part of the bar only, which is what he was talking about (since we were discussing visibility and getting your head up without craining).