Checking your Tyre Pressure

How to Check Your Tyre Pressure

A quick and easy guide to checking your Tyre Pressure


check your tyre pressure

Just take a trip down any Highway and your guaranteed to see a few tyres off the road that look “blow” This is caused from a faulty or worn out tyre. In most cases this happens due to a motorist having an under or over inflated tyre. In some cases this can be fatal but easily avoidable. We aim to show you how to check your tyre pressure and to minimize this risk. Of course we recommend checking the full health of the tyre as a worn out tyre will cause problems.

The good thing about having the correct tyre pressure is you will achieve more MPG and have a safer car to drive. Also you wont get pulled over if your tyres are far too low.

Never done it before? Checking Tyre pressure is very easy!

It should be no excuse as to why people don’t do this as part of there weekly checks. It cost’s you nothing to check your tyre pressure visually.

Firstly you will need to find the correct pressure rating for your vehicle. This information can be found in one of the following places.
a) Your car or truck’s manual
b) Printed on the inside ledge of the driver’s door
c) Inside the petrol cap.

Please be aware that the tyre pressure is set by the manufacturer so don’t just assume because you have always topped your car to a certain psi/bar it is the same for all vehicles.

Find your recommended tyre pressures

One other thing to note is how much load is in your vehicle. Depending on how much baggage your carrying or family members you will need to adjust your tyre pressure accordingly.

Here is a chart for a typical 5 door hatchback.

Tyre SizeFront TyresRear Tyres
165/70R14 T 812.3 BAR / 34 PSI2.1 BAR / 31 PSI
175/65R14 H 822.3 BAR / 34 PSI2.1 BAR / 31 PSI
185/60R14 H 862.1 BAR / 31 PSI2.1 BAR / 31 PSI
195/50R15 H 822.3 BAR / 34 PSI2.1 BAR / 31 P


Now lets begin by Measuring Your Tyre Pressure


tyre pressure illustration

Visaully testing is free of charge. A visual check is not accurate but can be used to quickly diagnose a tyre with a slow puncture. All you need to do is check for “ballooning” of the tyre. This is where the tyre seems to literally “balloon” out of the sides. It will look like the tyre is being pushed out under the weight of the vehicle. Also pushing on the tyres. Try to push in all tyres from the side if you feel a noticable difference between the tyres then you will need to do a full tyre check.

For an accurate tyre pressure check you will require a pressure gauge. You can purchase these from any auto shop or online.

Tyre Pressure Check with a Pressure Gauge

First start off by taking the dust caps off. Now place your pressure gauge over the valve. Take note of the result. If your tyre needs extra air you should then inflate the tyre using an air pump. If you don’t have one at home most petrol station provide the facilities to top up your tyres. If you notice the tyre is over inflated. According to your pressure charts. Then you can allow air to escape. Just make sure the dust cap is off first.

Once your tyre pressure is correct. You can remove the air pump. Just make sure there is no dirt in or around the valve. Once checked you can re connect the dust cap.

If your uncomfertable checking your tyre pressure at home you can visit an autoshop they tend to do this for quite a cheap rate. But word of caution they may give you new tyres which could set you back alot of cash! Always seek part work tyre dealerships you will save a small fortune doing this!


Pressure Guages – There not all the same and the price varies

There is a wide range of makes available to buy online or in high street shops. Costs range from below $5 to $25. The price really depends on the manufacturer. Some guages are made by road saftey or organisations or even trye brands. You could try something like this Tire Pressure Gauge Digital w/ Metal Body 150PSI

Bar Pressure or PSI Pressure

There are two measurement types when it comes to tyre pressure. There is PSI and BAR. It doesn’t matter which one you prefer to use just make sure your using the right one referenced. If it states 30 PSI Do not use 30 BAR. You can use the tool found on the next page to convert your pressure rating: Find your recommended tyre pressures


Poor tyre pressure – Thread wearing

incorrect tyre pressure

If a tyre is incorrectly inflated it will decrease it’s lifespan by up to 75% So why not avoid all of that and make sure you tyres are correctly set. You will save more cash in the long run. If you notice that your tyres edges are waring out fast chances are it’s under inflated. You should sort this out as soon as possible if left for too long you can expect fines and even points on your licence for having bad tyres.


Tyre Blow Outs

Now this is the number one reason why you should check your tyre pressure once per week. Blow outs cause loss of control of a vehicle and in extreme cases can cause loss of life. Some blow outs are unavoidable but 90% of the time these are caused by insufficient air in the tyre. Make sure you check your tyre pressure and if you suspet a puncture get it repaired at your next safe stop.


Improved Tyre Pressure = More MPG

If your all about the Benjamins then making sure your tyre pressure is spot on is a big deal. You can get more MPG by just making sure your tyre pressure is correct. If your tyres are under inflated then there will be more thread touching the road. This leads to more friction “Drag” which requires the car to use more fuel. It may not be a huge increase but it all adds up!

Tyre Inflation - a guide to tyre pressure

As you can see from the above image you want correct inflation to allow your tyres to fit to the road correctly. Which in turn improves safety on the road.


1.Make checking your tyre pressure part of your weekly check list. Also if your going on a long trip double check before setting off.
2.Make sure your Tyres our cold when you carry out the check
3.Ensure you have the correct tyre pressure guide. If you can’t locate this use the online search tool found above
4.Make sure you change the pressures accordingly when the vehicle is fully loaded
5.Use a working gauge to measure your tyre pressure
6.Remember to examine your tyres frequently. (Including the spare!)
7.If you have any towed vehicles like a horsebox or trailer. Ensure these are also checked for potential tyre risks.
8.Always do a visual check for tread wear or problems like slashes/cuts/bulges.
9.Pressure decreases more rapidly in warm weather. So if it’s summer time or you live in a hot climate make sure to check your tyres twice as often.
10.If uncertain, talk to qualified staff at any auto repair store.

stay safe and always check your tyre pressure

Checking tyre pressures is simple, often free and only takes a few minutes. Your recommended pressures will be printed in your vehicle’s handbook or stamped in the sill of the driver’s door or can sometimes be found inside your fuel cap.

If you don’t have your own pressure gauge we recomend you purchase one right away to avoid any nasty problems further down the line!

So stay safe out there!

Regards, Beat The Mechanic