I'm not sure that's completely accurate. When you stand on the pedals that weight is concentrated at the bottom bracket. When you're in the you're in the saddle where is that weight concentrated? And, the distribution can be altered by steer length and fore/aft seat adjustment. In other words...I can adjust my seat forward ## distance, and increase steerer length by the same distance and keep that measurement constant. It's in effect changing the geometry. Depending on the terrain it can be more advantageous to move the weight distro/center of gravity fore or aft.
What I want to know specifically is the weight distro, and can it be altered permanently by adjustment, or temporarily by standing/sitting/etc?
Dan