The spacing and sizing of the flanges is one of the most important things to ensure a stiff wheelset. I like to think of a wheel more as a triangle versus a circle, where the hub is the base of the triangle and the rim is the top point of the triangle. When designing a triangle, to make it more structurally sound, you want to increase the base as wide as possible. This helps to increase the bracing angle, the angle at which the spokes enter the rim.
With the front 85 hub we could push the flanges out almost to the edge of the hub. This helps to ensure a very stiff and well responding front hub.