Originally Posted by
kingfishr
The only relevant component is air resistance on the flats, not the weight. So if the guy lost 50 pounds but had the same aero-profile his speed would be unchanged. And if he gained 50 lbs and had a better aerodynamic profile his speed would increase.
That was my point. There is a direct correlation between weight and aero profile. Also between efficiency and bodyfat %. So adding 50 lbs of weight to a rider is different than adding lead weight inside a seat tube.