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hey frank, if your contact patch is circlualar at high psi then u would figure area with pie r squared. using that formula 2.5 *2.5*3.14 gives a total of 1000. again i am not saying that this method is accurate. but the theory of contact patches being the same for the same psi and weight is. Just for the record. The weight method is not super accurate. There is lots of variables, (air gauge, measuring methods, even tread patterns, etc can effect the results) .
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