Reply To: Proper Tire Inflation Pressure

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January 11, 2015 at 7:18 am #398837
David Coco

The pressure per square inch on the road is equal to the PSI in the tire, ignoring any sidewall support.

Thus, for your 4000 pound Napier, at 80 PSI in tires, the contact patch total is 4000/80 = 50 square inches. Thus, 12.5 square inches per tire contact patch on the road….