You know, if you have a cycling buddy that faster than you and then doesn't let you forget about it. Fill his or her tubes about halfway with water and go for a ride with them.
Maybe I can pick up a Schwinn XR-1 to XR-6 exercise bike and replace the solid rubber tire with a regular tire and tube, but fill the tube about halfway up with water. Maybe add some propylene glycol, so it doesn't freeze and some glycerin to thicken it up. I seem to talking myself into yet another Schwinn project. By adjusting the amount of liquid and the thickness of the liquid I could adjust the resistance. At slow speeds, the resistance would be low. As the tire rotates faster, I would expect the resistance to increase due to churning of the liquid, then at some critical speed the liquid will be "plastered" against the perimeter of the inner tube and resistance will level off or even go down. Will it go down again? Does resistance ever go down as the rpm's go up? I would think that in this case, it would.
Any physicists or fluid dynamic experts want to weigh in on this? Calling
gugie .