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The vehicle is supported by air pressure not by the tire. A runflat tire will support the vehicle when the air is removed but when inflated it rides on air. When you change tire brands the size of the air chamber stays the same. A tire with a reinforced sidewall is stronger to take more cornering forces and can hold more air presure to carry more weight. The presure printed on the tire is the maximum not the recommended.
The vehicle manufacturer plac has the information for the OE size and often optional sizes. The information is for normal highway driving. I've seen charts for size, presure, weight and they're pages long. They wouldn't fit in a door jam and most people would never read them.
Joe
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