Zipp chart shows no significant increase in wind resistance force from 20mph to 30mph while Mavic (just a quick Internet search result) says 20kph to 40kph = 4X aero drag. Why weightings should be applied to wheel drag data to measure aerodynamic performance ?Engineers talk

I don't know if its an editing error, or if they actually saw those numbers and thought nothing of it, but for Zipp to have a rather old article on their website indicates few call them on it - or I still have no idea what they are saying.