Originally Posted by
rydabent
I suspect that pro racers ride with the smallest frame they can to save weight. They make up the fit with longer stems and seat posts.
They don't do it to save weight, taller riders ride smaller frames to improve aerodynamics at the expense of comfort and better handling that a properly sized frame would provide. There is no need to save weight, even the biggest bike frames ridden by pros can easily be built up to go under the UCI weight limit