Nope, not nonsense. I've been trying to oversimplify things a bit. I'm not actually trying to suggest that all 0.4 Joules gets distributed as "lost" energy. You get some of it back (most? I don't know.) by rolling back down the bump. What I'm trying to say and should have said from the beginning is that you lose a portion of that energy. This is in addition to rolling resistance. I believe there is a certain pressure at which the total resistance (Crr + losses due to travelling over uneven surfaces) is optimized.
I'm willing to discuss this. I'm willing to learn and to admit my mistakes. But your tone seems a bit harsh. I'm not willing to continue if you're feeling defensive and angry. Besides, we seem to actually agree on most of the issues.
One last point is that both of us may be wrong about the model we choose to describe the behaviour, but I believe the conclusions are correct. Higher pressures for smoother surfaces and an optimum pressure exists to minimize total rolling resistance.
John Swanson
www.bikephysics.com
I'm willing to discuss this. I'm willing to learn and to admit my mistakes. But your tone seems a bit harsh. I'm not willing to continue if you're feeling defensive and angry. Besides, we seem to actually agree on most of the issues.
One last point is that both of us may be wrong about the model we choose to describe the behaviour, but I believe the conclusions are correct. Higher pressures for smoother surfaces and an optimum pressure exists to minimize total rolling resistance.
John Swanson
www.bikephysics.com