Originally Posted by
nomadmax
When looking at pro racers saddle height dynamically (IE while they're pedaling) it's important to note where they're perched on the saddle. When making big power on the flats they'll pull themselves out on the nose of the saddle, effectively placing their hips closer to the BB center/reducing setback. This effectively reduces saddle height just as pushing the hips toward the rear of the saddle during a seated climb increases it.
True, but riding on the rivet and pushed back on the saddle and standing all serve the same function: that of moving the center of gravity forward to enable (temporarily) higher power output, albeit with reduced efficiency. For higher cadence and high power, you ride on the rivet; for lower cadence and progressively higher power, you ride pushed back on the saddle or stand. Setback and saddle height should be set for efficient steady-state riding.