When checking tire inflation, what is most important?

The most important factor when checking tire inflation is the use of a gauge when tires are cold. Tire pressure can fluctuate based on temperature; as tires heat up from driving, the air inside expands, which typically results in higher pressure readings. Therefore, the most accurate measure of tire inflation is obtained when the tires are cold, as this reflects their true pressure without the influence of heat generated during operation. Using a gauge in this condition ensures that the reading reflects the proper inflation needed for optimal performance and safety.

Visual inspections or checking inflation without equipment may not provide accurate information, as they can miss subtle but critical pressure discrepancies. Similarly, while regular weekly checks are important for maintenance, the immediate focus should be on the accuracy of those measurements, which is best achieved when the tires are cold and using an appropriate gauge.