Obviously position matters, but I am not sure just stating head position is a good determiner of whether a helmet is going to be fast or not. Now if you're talking about looking straight down then I agree that something without a pronounced tail is probably going to be better and since that type of head posture requires "peeking" then something like a Cerebel or Bambino would be good choices there. However, if by head down you mean something like my position:



Then I think the question is not as clear whether short, long, bulbous, narrow, etc. is better. You don't know unless you test. And I think body type and position might play a bigger role in what is a good helmet and what isn't. For me I am having my doubts as to how good the Cerebel is for me and am thinking of going back to my Selector (which tested very fast for me) or perhaps trying the S-Works.

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