eli5: Why can you only learn your proper tire pressure from the car and not from the tires themselves. Wouldn’t different kinds of tires need different pressures on the same car?

Question

Same tires, different cars = different recommended tire pressure

Different tires, same car = same recommended tire pressure

This doesn’t make sense to me. Why is this?

In: Engineering

Answer 1

Recommended tire pressure on a car is based off the car manufacturers recommended tire pressure for optimal driving in terms of handling, efficiency, and safety.

That depends on many factors of the car itself, its weight, wheelbase, length, height, etc.

The tires are able to work under many different pressures without breaking, so manufactures optimize pressure to the car not the tire.