Isn't that a pastry with a cream filling? You do get some opinions on air pressure. Usually the harder the surface, the higher the pressure. Doesnt count when you are trying to run a soft terrain tire on a hard packed surface, but nothing really works with that. I had this guy famous for being able to ride any kind of bike in any kind of race and do really well. (He is also famous for smiles.) We were talking about what pressure to run in the Swedish made Trelleborgs. He showed as that you will be over inflated if you can place the weighted tire on a center knob and not have the knob in front of that knob and the one trailing it to be touching as well. It made sense to me then. The spacing is further on the soft terrain tire than on a hard terrain, and the harder-softer logig made more sense. 40 something years later, it is still a pretty good test that covers things about the sidewall and the rim width as well.