When should you check tyre pressure?

It is recommended to check tyre pressure when the tyres are cold because as tyres heat up during a long drive, the air expands and can give a false reading. Checking tyre pressure after a long drive or at the end of the day may give an inaccurate reading. It is also not necessary to check tyre pressure once a week regardless of condition, as the pressure may not have changed significantly in such a short amount of time. Therefore, it is important to check tyre pressure when the tyres are cold to get an accurate reading.