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Dry tires are using pretty low air pressure. On a warm sunny day usually the air pressure is under 1 bar. Of course different tyre compounds have different air pressures. On the other hand, wet tires are using much higher air pressure. Because when there is water between the track and tires, the tires won't heat up as easily as when the track is dry. The air pressure itself are usually somewhere between 1,3-2,5 bars, obviously depending on the conditions (i.e. more water, higher pressure).