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@deleted
correct. very labor intensive. Even more so in CF or other materials. UCI has become obsessed with making bikes look like they did 100 years ago.. stupid backwards thinking. Seems like drugs are OK, but not reducing wind drag, which would benefit all users.
regarding the small holes.. they are for a specific speed range and probably do increase drag at lower speeds.
Lips are in fact vortex generators to keep the air flow laminar on the surface of tubes.
unfortunately all your comments are wasted as this is all very illegal and until the UCI comes into the modern age.
As a general rule.. the bigger holes allow the air to pass through rather than using exotic Formula One like designs to control air around and on the surfaces. Not enough surface area or velocity to work well on a bicycle.
dave