At what moment must tire inflation pressure be checked in order to get an accurate reading?

Question

DentroTest · Accepted Answer

Tire inflation pressure must always be checked cold, that is, before setting off or after having driven less than 2 or 3 kilometers at moderate speed. As the tire rolls, friction heats the air inside it and the air expands, which produces a natural increase in pressure that would distort the measurement if it were taken hot. If it is measured hot, air must never be released, because when the tire cooled down it would be underinflated, below the optimal level. Nor must it be checked by eye alone, since modern radial tires can have lost a considerable amount of pressure without showing any obvious deformation.

At what moment must tire inflation pressure be checked in order to get an accurate reading?

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