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How to check your tyre pressure .

​​To keep your vehicle running safely on the road, it’s important to take care of your tyres and maintain them in between MOTs and services. Due to the shortage of new cars following on from the pandemic, people are keeping their cars for longer, making it even more important to look after your tyres. If you want to avoid any tyre problems which could result in leaving you without a car and a bill to pay, you can follow these really simple steps!  

When to check your tyre pressure?  

Male person checks the tire pressure

You might be wondering when you should check your tyre pressure – which is also known as wheel pressure. It can be surprising, but the pressure of your tyres should be checked weekly. If you’re heading on a long journey or there are changes in your vehicle’s load, the tyre pressure must be checked and possibly adjusted, before setting off.  

You will want to avoid the ‘check tyre pressure light’ – and other warning lights – from appearing on your dashboard. To do all that you can to prevent this, you should always make sure that your driving habits are sensible and that the following are as they should be (according to your vehicle handbook or a professional)…  

  • Tyre pressure 
  • Tyre tread depth 
  • Wheel alignment 
  • Vehicle load 
  • Type of tyre (Seasonally appropriate) 

If possible, avoid driving over uneven surfaces and potholes and try to slow right down when travelling over speed bumps, which will also help maintain your vehicle’s suspension. You can also rotate your tyres so that they deflate and wear evenly.  

Close up of a car wheel in a bad condition

Essentials to measure tyre pressure 

There are some essential tools needed to test your tyre pressure. Don’t fear, the information is easy to find and you don’t need a long list of specialist equipment at home to carry out this simple process. 

Tyre pressure gauge 

You can test your tyre pressure by using a tyre pressure gauge, which is sometimes known as a tyre checker. This is technically checking how many air atoms you have. The more air atoms you have, the more atom collisions there are which increases the pressure on the sides of the tyre (but in simple terms, it will tell you if your pressure is too low or too high). There are a few different types of gadgets to measure this, including stick, analogue and digital devices. Even if you don’t have a tyre pressure gauge, your local fuel station likely does.  

Air pressure 

“How do I know my tyre pressure?” is a common question that many of us might feel confused about, especially if the panic of the warning light’s appearance has already set in. Keep calm though, checking and reading tyre pressure is quite straightforward.  

The air pressure in tyres is commonly measured in PSI (pounds per square inch). Occasionally, you may see that the pressure is measured in Bars. It’s easy to calculate the conversion though, 1 Bar = 14.5 PSI.  

The gauge will show the reading via displaying the number on the screen or the circular dial, this depends on what type of tyre checker or pressure gauge you’re using.  

Note: Most car manufacturers recommend 33-36 PSI, however individual car brands and models have different guidelines on air pressure. It’s essential that you check what PSI is correct for your vehicle, to avoid over or under-inflation.  

Where can I find information about my tyre pressure?  

You can find this information in your vehicle handbook, the sill of your driver’s door, and possibly inside your fuel cap. Your tyre pressure sticker will have a list of tyre sizes, so you need to make sure that you read the correct PSI for the tyres that you have fitted on your vehicle. Many vehicles have several tyres which are compatible with them, so it’s best to check. Tyre pressure charts are also helpful to confirm which measurement of air pressure is suitable for your vehicle.  

Woman inflating car tire with electric pump

Modern vehicles 

Checking and adjusting your tyre pressure and dealing with any issues that may be brought to your attention as a result of this, is generally a similar process for all drivers. Possibly the only exception to this would be high-performance car owners, who are typically advised to be more cautious. ​​High-performance tyres may not be repairable, if you do find a slow puncture. This is because some tyre speed ratings can be put under high stress. Additionally, run-flat tyres have become more common now and are different to standard tyres. They are reinforced tyres that can run even when deflated, in case of an emergency.  These tyres are more expensive and can rarely be repaired.  

As highlighted previously, many new cars are compatible with quite a few different types of tyres. An example of this is Lotus, who works with a number of leading tyre manufacturers. The air pressures for these different tyres can be between 30 and 36 PSI. This means that extra attention needs to be paid to the corresponding PSI to the tyre type.  

Most newer vehicles have a tyre pressure monitoring system (TPMS) fitted, which alerts you if the tyre pressure increases or decreases. This is a big help for drivers and is the system which causes the check tyre pressure light to illuminate – reducing the risks of unknowingly driving with an unsafe tyre. In 2015, the UK government passed legislation which states that vehicles first used on or after 1 January 2012 with an inoperative or faulty TPMS face an immediate MOT failure. 

Tyre compressor 

Tyre compressors are used for tyre inflation and can be found in almost all fuel stations. Some people may have their own air compressors for cars, which can be especially useful if the vehicle is not at all driveable.  

They are pneumatic devices that convert power into potential energy – as compressed air. These machines come in all sorts of forms; from plug-in tyre inflators which plug directly into your vehicle, to handheld rechargeable gadgets, to larger ones that plug into the mains. Most air compressors have integrated control panels as well as built-in pressure gauges and regulators. 

I don’t have the tyre pressure equipment I need… 

If you’re heading to the forecourt to sort your tyre pressure, you need to be aware that checking tyre pressure after driving is likely to give you a misleading reading. This is because as you drive; 1. the temperature of the tyres increases and 2. the tyre pressure does. So the hotter the tyres, the higher the pressure – giving you an unreliable reading. Doing this check on your tyre pressure on hot tyres will probably result in underinflated tyres. Best way to avoid this is to check and maintain your tyre pressures at a nearby garage, especially at the start of a long journey. This will mean, the tyres are as cool as possible. 

You may wonder where you can check and alter your tyre pressure for free. Another bonus of using a garage’s equipment is that many offer free tyre checking services. Additionally, if your tyre pressure is too low, air compressors at petrol stations cost as low as 10p per minute to use. 

Washing car tire

Did you know that your tyre pressure can affect the following? 

You may be able to tell if tyres need air by looking out for differences in your driving experience. If you notice any of the changes listed below, it could be a sign that your tyre pressure is low.  

  • Fuel consumption – uneven pressure can cause your vehicle to work harder, meaning you use more fuel. 
  • Braking distance – braking time will increase when pressure is low. 
  • Vehicle performance – handling accuracy can be affected by uneven tyre pressure. 
  • Uneven wear – low tyre pressure can cause uneven wear and tear on tyres. 
  • Punctures – tyres filled with less air are more prone to punctures. 

Six tips for keeping tyre pressure tip-top: 

  1. Remove the valve dust cap from the tyre valve and place the pressure gauge securely onto the tyre valve stem. 
  1. To ensure you get an accurate reading press down the gauge evenly on the valve stem. 
  1. Check the reading on the pressure gauge to determine if you’ll need to inflate or deflate your tyres. 
  1. If your tyres need inflating, use a suitable pump. Add small amounts of air at a time to avoid over-inflation. 
  1. If your tyres need deflating, use the tip of a flat-head screwdriver to push on the metal pin on the valve stem to release air slowly. 
  2. Take regular measurements with the pressure gauge between inflating and deflating. 

Ensure you check your car tyres individually, as the pressure in each tyre can be very different. By checking your tyres regularly you can avoid unnecessary garage costs and possible road traffic accidents.  

Bonus Tip – Check the pressure on your spare tyre too if you have one – you never know when you might need to use it! 

Persisting issues and how we can help 

If you have completed the above steps and your tyre pressure still seems inaccurate, you may have a slow puncture or have checked the tyre pressure when hot. 

The outdoor temperature changes optimal tyre pressure. You should add or remove 3-5 PSI to your vehicle’s guideline PSI, during hot or cold weather.  

Can slow punctures be repaired? Possibly. This depends on what is causing the puncture. It is best to visit a garage or a tyre specialist, who can assess the damage. Sometimes, nails and debris can be removed, and tyres can be fixed via plugging the puncture, usually at fairly low prices. 

A mechanic fixing a lifted car

Alternatively, if issues such as the steering pulling to one side or a constant warning light persist, you may have a more complicated issue such as wheel dealignment or a connection problem within your motor’s computer.  

Find out how you can try to prevent these hiccups in caring for your vehicle correctly. Remember, we provide one of the UK’s most comprehensive warranties so if you’re not yet covered, you can find out more about what Warrantywise offer or contact us on 0800 001 4990. 

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