Originally Posted by
Ironfish653
This tells me there’s some minimum to how low you can make the rider position.
The only UCI restriction on bar height is that they must be higher than the top of the front wheel. There is no upper limit. What you probably saw was them measuring the difference in height between the arm pads and the ends of the extensions. The ends of the extensions must be within 10 cm of the height of the arm rests up or down. The reason for the high risers is that it's been found that by separating the airflow around the arms and the bars, drag is reduced.