Originally Posted by
Road Fan
The idea as I first read it in one of Zinn's books, is to find a position like that of a downhill ski racer in a tuck. The body CG needs to be centered over the feet, otherwise the body will tend to fall forward or backward. The correlation to cycling is for the body center of gravity to be above the BB axis, or close enough you can keep yourself in place without excessive hand pressure or without feeling like you are flling back off the saddle. That's the idea of "balance" as I see it for my own fitting.
Descending, I like to put most of my weight into the pedals, light on the saddle, light on the bars, take the bumps in my knees. I used to train for Downhill but didn't race much. Huge fun.