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Demonstration of different tyre pressures on a fat bike. I searched in vain for a video like this before I got an accurate pressure gauge; hope it might be of use to someone looking to get a rough idea of what pressure they're running. I've found that roughly four chambers-worth of air from a floor pump gives about a one-psi rise in air pressure in these tyres. Also, if you get the tyre pressure sorted indoors and then head out into sub-freezing temperatures, you can expect it to drop by around a third to a fifth, depending on how chilly it is out there and how much pressure is in the tyre to start with. For this video, I made pressure adjustments and readings outside for accuracy's sake.