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Basically, you draw a line through where the thread pattern ends and where the side wall begins (most tires are marked for with a triangle) with a chalk. You go drive around normally and check where the chalk has been faded. If the fade is towards the sidewall, pressure is too low, if the fade is towards the thread pattern, tire pressure is too high.
There is a write-up on this board for this somewhere.
My question is: PSS's don't have a triangle mark?
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