Originally Posted by
wfrogge
Shifting ones weight forward? starting your stand with the pedal down (no force)?
/discuss
In the sense of center of mass (COM), if you're COM is moving up a steep hill at 10mph and you stand, you're probably moving 90% of the bike weight (your body) forward faster than 10mph, meaning the bike itself has to either slow down or go backwards (just for a moment). Now, I suppose you could apply sufficient force just as you started standing up that you keep things moving forward.
Even if all the wheel does is slow down, someone close on your wheel could bump it.