Car tyre pressure is measured by calculating the amount of air that has been pumped into the inner lining of your tyre in pounds per square inch (PSI) or BAR pressure.
The manufacturer of your vehicle will specify the suitable pressure for your tyres, and it is your responsibility as the driver to make sure that the pressure is checked and corrected on a regular basis. We recommend doing this every two weeks to ensure optimum tyre pressure.
Under inflated tyres
Tyres can quickly become underinflated if you don’t check them regularly. Under inflated tyres will have uneven contact with the road and will exhibit excessive wear on the inside and outside edges of the tread if they are left underinflated for some time. Not only does low tyre pressure wear your tyres out more quickly but you may also experience increased rolling resistance with the road which means reduced fuel efficiency and increased CO2 emissions.
Over inflated tyres
Putting too much air in your tyres can be just as damaging and costly. Over inflated tyres will have a smaller contact patch – the part of the tyre that makes contact with the road – which can lead to a loss of traction and poorer braking distances. Overly high tyre pressure will also cause heavy and uneven wear across the central part of the tyre leading to shorter tyre lifespans than if it was correctly inflated.
Correct tyre pressures
It’s not always apparent that air is being lost from your tyres, but it generally escapes at the rate of up to two PSI of air every month. More air is usually lost during warm weather, so more regular checks are needed when temperatures rise.
You can find the recommended tyre pressure for your vehicle in your vehicle handbook or printed either in the sill of the driver’s door or on the inside of the fuel tank flap. Your vehicle manufacturer may suggest different tyre pressures for your front and rear tyres so make sure you aware of these guidelines.
Sources：KwikFit