Well, I never said anything about a bike frame being a perfect spring (in fact I pretty well ruled that out when I said a frame has LOW hysteretic loses rather than NO hysteretic losses), so why did you bring it up and go on at length about it?

You keep saying that a frame is not a spring, but when asked what the difference is, you just say it is made up of different parts. Well, on a steel frame those parts are all steel, all with relatively efficient spring characteristics. Not perfect, but relatively efficient.

To say that something "Mainly" dissipates energy (which I assume means most of the energy) through hysteretic loss in just a single compression is some pretty heavy damping. Where exactly is all this damping happening? In the welds?