I figure a zone from max sidewall to 50 psi should cover most situations nicely. Experiment with different pressures to see how much ride harshness you can live with. Over 50 psi I think delivers little in the way of reduced r.r. but gets you into the territory where strange wear can happen. I'm talking about passenger car tires, not truck tires or other tires that are designed to operate at more than 50 psi.
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