At what psi can I travel 65-75mph?
This Maxxis pdf has the same table. Using the table(s) above, my ST175/80R13 with 1060lbs load could run at a minimum 35psi with ~4% reserve capacity. Is there a +10lbs rule? I run with +1...
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If you will check, the real difference between SP tires and LT tires, is that the sidewalls are stronger on the LT tires, therefore reducing the failure of sidewalls. That really is the only difference and that's why they don't recommend SP tires for steer tires, as they fail under side load.
