Originally Posted by
Racing Dan
Id be more interested in a silent helmet than saving 2 watts at 50 km/h.
All depends on what your goals are.
If you've trained all you can train and time trial is your game......go with the faster helmet. I can't imagine a helmet would have so much noise as to be annoying but also be the faster helmet.
As for the testing at 40, 45, and 50kph........for TT at least........not everyone lives where it is pan flat. Sure, in a pan flat area folks doing TT might never sniff 30mph worth of actual airspeed (not ground speed). But with hills, even the slowest TT riders can go over 30mph for enough time that the aero would matter.
I do my own testing to make sure stuff works with my fit and my airspeeds. I don't trust manufacturer claims or tunnel tests on folks with different positions.