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The most important thing is the contact patch and the sidewall flex, both of which are spec'ed for the tire.
The car manufacturer, of course, doesn't want you to put on 70psi low-resistance tires on a stiff-suspension sports car. It would probably break an a-arm and they'd get sued.
There's a shock absorbtion balance between the tires and supension system, tire characteristics all over the map, and parts wear out, so it up to the consumer to tweak for best results.
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Meanwhile other things are still happening.
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