As a partial explanation, maybe it's not the case that area = weight/tire pressure as an absolute rule? In which case we get back to the layman knowledge of "wider tires have a greater contact area."
As an extreme example, run flats at atmospheric tire pressure don't drastically change their area.
As an extreme example, run flats at atmospheric tire pressure don't drastically change their area.
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From https://www.6speedonline.com/forums/996-turbo-gt2/242759-imp...