Tyre pressure is one of the most frequently neglected aspects of car maintenance, yet it has a direct impact on safety, fuel economy and how long your tyres last.
Why tyre pressure matters
Under-inflated tyres flex more on each rotation, building up heat and wearing the outer edges faster. They also increase rolling resistance, which reduces fuel economy. In severe cases, under-inflation can cause a blowout. Over-inflated tyres reduce the contact patch between tyre and road, reducing grip, and cause accelerated wear in the centre of the tread.
How to find the correct pressure for your car
The correct tyre pressure for your specific vehicle is not printed on the tyre itself. The number on the tyre sidewall is the maximum pressure the tyre can hold, not the recommended operating pressure. The correct pressures for your vehicle are found in your car handbook and on a sticker inside the driver door frame. Many cars have different pressures for the front and rear axles, and the recommended pressure often changes when the car is fully loaded.
How to check tyre pressure
Check tyres when they are cold, meaning the car has not been driven for at least two hours or has covered less than two miles. Driving heats the air inside the tyre and increases pressure, giving a falsely high reading. Use a digital or dial gauge at a petrol station air machine, or invest in a small portable gauge for home use. Insert the gauge onto the valve stem on the inside of the wheel and read the pressure shown.
How often to check
Check tyre pressures at least once a month and before any journey over 50 miles. Tyres naturally lose pressure over time at a rate of around 1 to 2 psi per month even with no puncture or damage.
If you notice one tyre losing pressure faster than the others, bring your car in to Steins Garage for a check. It may have a slow puncture or a faulty valve. Call 0131 554 3423 or get in touch here.