From fulltilt
If you would allow me to point out a few important points, the pressure listed on the tire is calibrated for 70 degrees F, this is the temperature that many industries use as a basis, not just the tire industry, you extrapolate from there. So for every 10 degrees + or -, outdoor temperature, you have to alter your pressure by 2%. There is also an altitude adjustment but I haven’t felt the need to use that.
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