Decent description of what's important:
With all that said, the Kask Bambino has tested really well for a variety of rides. Personally, I love the Rudy Project Wingspan (and the Wingspan 57 is even better, just spotty availability).
As others have said, the most important aspect of the helmet is fit. It has to fit your body position when exhausted on a bike. My old colleagues are currently doing a lot of wind tunnel studies with cyclists for the Australian Institute of Sport and they have found the same thing. Different helmets work for different riders.
However the Giro A2 tests well on lots of people. Depending on your position, it might be the fastest or it might be in the top 2 or 3 for you. But I have heard that it tests very well on lots of people.
If you are also looking for something to use on a road bike, the Specialized Evade tests very well and is comparable to many TT dedicated helmets. Better venting as well and safer to ride on training rides and races as you will be better able to hear cars and other noises around you.
Which is why many helmets are now designed to work well in the heads down position as well.
Helmets that interest me at the moment are the Lazer Wasp and Kask TT helmets. I also think it would be fairly simple to do some flow-visualisation testing on a helmet to give you an idea of how effective it is.
I think the visor is significant, however there can be fogging issues.
As far as I understand the purpose of such a helmet mainly is to reduce drag.
Does anyone know if there were done experiments with just normal round or egg shaped helmets with smooth surface and a kind of gurney style little spoiler on the back of a shirt?
Short tailed helmet that has tested fastest for quite a few people, especially those that tend to look down a lot (and so the tail sticks up in the wind), and faster than its bigger brother, the Speed Demon
Not a popular helmet, but seems to be a similar shape to the crop of newer short tailer helmets available.
Will dig up a link and post it later on.
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