Your tyres must be inflated to the pressure specified by the vehicle and tyre manufacturer. This normally varies depending on the load and service conditions.

The specified pressure always refers to the COLD tyre and must not be allowed to fall below this value. The pressure inside warm tyres will be higher due to the fact that driving causes heat build up. So never reduce the pressure inside warm tyres. because when they have cooled down their pressure could fall to below the minimum tyre pressure.

The tyre pressure (including the spare if you have one) should be checked and adjusted every 14 days. Especially important is to check and adjust your tyre pressures before going on a long journey or on holiday, where the additional load may require the tyre pressures to be increased according to the specification.