Originally Posted by
rydabent
My two cents here. Yes not only does the cyclist on a DF bike push down on the crank with his weight, but if standing he has extra push by pulling up on the handle bars. If he does not pull up, he can only push down by the amount of his weight.
Reading (quickly) through the physics of the first pages, it apears to be assumed that the conditions are pushing down only, against the rider's body weight, on flat pedals.
Add in clipless pedals, and get out of the saddle, and the physics get way more interesting.
Take a look at the upper body mechanics going on in the Chris Hoy video in post #58. Wow.
I'd love to put a strain gage on the stem of that rig. Heck, he's not even in the saddle untill the end of the back straight.