Pressure: did you know that...

The pressure of the tyres increases (with hot weather) or decreases (with cold weather) by 1-2 psi each 9°F of heat variation.

Under normal driving conditions the tyres lose 1-2 psi of pressure per month.

Some spare tyre models require a greater pressure.

The tyre pressure might need to be higher than the standard values, in order to compensate for heavier vehicle conditions.

A tyre may lose up to half its air and not seem to be under pressure.

Insufficient pressure is the main cause of damage to tyres.

For driving at high speeds, the cold pressure must be taken from 1.45 to 4.35 psi (hot from 4.35 to 8.70 psi). For particular cases, the manufacturers of the vehicle or of the tyres may recommend different values in their respective user manuals.

The air-tightness of a tubeless tyre or of the inner tube is not completely guaranteed if a valve cap with seal is not used.

When a 'caravan' is towed, the inflation pressure of the rear axle tyres must be increased according to the specific recommendations of the tyre manufacturer concerning the weight on the towing bar.