Denne var noe av det bedre jeg har hørt på lenge
RATE OF RISE-- Finding the Best Air Pressure For Any Tire.
The best air pressure in any tire changes depending on load, speed, terrain and weather. One pressure does not work in all situations. For example, in the sand we have one pressure for cool morning starts, then a lower pressure for afternoon sun when surface temperatures go 130F/54C and another for racing at night (Baja1000, etc.).
You can test any pressure for any given condition by "Rate of Rise." This is what I call a trick I learned in road racing and now use in rally. It works for adventure riding too! Pick pressures that you think are going to work. Set those pressures cold. Now it's time to do some testing.
Go for a test ride in the situation/conditions you will be racing/riding in and heat-up the tires up to operating temperature. Air expands when hot and causes a pressure increase in the tires. Get off and immediately check pressures. We want a 10% higher air pressure from cold to hot (16>18, 20>22, 32>35, 42>46, etc.) Obviously we use a high quality, oil-filled air gage that can adjust in precise excrements.
If you read more than a 10% Rate of Rise, the starting pressure was too low, too much tire contact patch. If less than 10%, the starting pressure was too high. Record your testing and try again with cold tires (the next day or with a wheel change) until you get 10%. Eventually you will have a list of pressures for various situations: type tire, surfaces, one/two-up, on/off road, hot day/cold, etc.
Too much work? In racing the difference between winning and losing is attention to detail. Think about how your tires effect traction and handling. Air has a GIANT effect that you can feel through the handlebars if you are paying attention. For road riders, it's a ball-park test that can be done daily on a trip. Do your second air-check when you stop for gas or a coffee. Just check BEFORE getting gas/drinks as your tires cool-off pretty fast. Coach