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Tour Magazine did one.
Cant seem to find it.
There is this....
http://www.aeroweenie.com/assets/img/data/erosport-aero-road-helmets.jpg
From what I read Things get more interesting when you add a visor. So decide whether or not you're willing to og full top gun.
Is there any decent test data kicking showing which 'aero' road helmets are faster?