Why does tire pressure reduce?
Tire Pressure usually goes down when the temperature gets cold outside, or the vehicle has sat for a while. Because tires are made of rubber they expand and contract with the temperature difference. Another thing that causes tires to loose pressure is the air inside them. Because warm air rises, and cold air sinks. When the tires are contracting from the cold, the air inside the tire sinks out through the contracted openings around the rim and valve stem, just enough to loose some pressure.
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