When should air pressure in tyres be checked?

Air pressure in tires should be checked when the tires are cold because this is when the pressure readings are most accurate. When tires are warm, due to the heat generated by driving, the air inside expands, leading to higher pressure readings. This can result in an inaccurate assessment of the tire's inflation level, potentially causing safety concerns or affecting vehicle performance.

Checking tire pressure when they are cold gives you a true representation of the tire's pressure as it hasn't been influenced by heat buildup from driving. It is best to measure the pressure in the morning before the vehicle has been driven, or at least three hours after the vehicle has been parked. This practice helps in maintaining optimal tire performance, improving fuel efficiency, and ensuring safety on the road.

Tire pressure can fluctuate due to temperature changes throughout the day, so regular checks in cold conditions can help avoid complications that might occur from driving with improperly inflated tires.