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xavierdisley
hippy
I'm thinking more like Aerocoach services. They're not selling helmets and if no helmet was faster there'd be more riders leaving their sessions without helmets.
Frontal area isn't the be all end all of aero. If you can get your head low enough, aero helmet fill the gap behind your skull and probably shift air over your shoulders (but that's Xav's area I'm just guessing).