Originally Posted by Kapusta

Please explain how seat angle could influence or mitigate toe overlap. Toe overlap is a function of the distance from the bb to the front axle. This is mainly determined by reach, head angle, and fork offset, wheel/tire diameter, and to a lesser extent by stack and fork length. I can't see how STA would have any effect on this distance.

You do often see differences in head angle and fork offset on smaller frames, and I always assumed that was to help address issues of toe overlap.

I don't really know why they change the STA, but my best guess would be because they anticipate a difference in the bb to saddle fit needs for shorter legged riders.