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When it comes to putting new tyres on your vehicle, it isn’t a case of one size fits all. If you need to find out what tyres you need, or want answers to some of the more common questions when it comes to tyre size, we’ve put together all the information needed to help you out.
Can I change my tyre size?
As we explored in this article on changing tyre size, your car’s tyres are sized and shipped in relation to the size of the actual rims that they’re mounted on. This itself is designed to account for an overall size of the wheel - which affects things such as steering and suspension.
If you change the size of your rims, then you could - in theory - change the size of your tyres – so long as the overall diameter of the wheel stays the same. However, your speedometer would need to be recalibrated with most changes to tyre size. And your tyre pressure may need to be adjusted accordingly.
Don’t mismatch your tyres
It’s also worth noting that you should never mismatch tyres on an axle pair. This is because the tread pattern serves to divert water and debris away from the tyre, so that the tyre can grip the road surface. As such, having tread patterns that divert in different directions or in different ways puts an uneven stress on the whole axle system; this, in turn, leads to uneven and premature wear along all parts of the system.
What’s more, mismatching tyres on axle pairs can reduce handling in wet conditions or on loose ground.
How to find the tyre size for my car?
So you’re now wondering how to find the right tyre size for your particular car. With the variety of tyre sizes available, it’s really important that you’re putting the right size tyres for your individual car or van. One way to find which tyres would be correct for you would be to look at the sticker that’s usually found on the inside of the driver side door jamb – this is the same sticker that you can find tyre pressure on.
One method that many people use is to simply look at the current tyres on their car - the tyre markings tell you what size the tyre is. However, if you’ve recently bought the car second hand, then there’s no guarantee that the previous owner has fitted the correct tyres.
Another way to find your tyre size is to consult your service or owner’s manual. So make sure you don’t lose it!
Perhaps the easiest way to find the right tyre size for your car is to use our Tyre Size by Registration Plate tool. All you need to do is put in your number plate and the most likely fitment will show. We recommend you check this against your user manual to be extra sure, but we find that the tool is most often correct.
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Your tyre size can be found on the sidewall of your current tyre and is a sequence of numbers and letters. The most common tyre size in the UK is 205/55R16 but there are many variations so it’s important to check your existing tyre first before searching for tyres.
Tip: Take a photo of your existing tyre sidewall to make it easier to identify your tyre size using the guide below.
The first three digits. This displays the width of the tyre in millimetres. A tyre marked 225 will measure 225mm across the tread from sidewall to sidewall.
Aspect Ratio
The fourth and fifth digits of the tyre code that immediately follow the tyre width. The aspect ratio or profile height of the tyre sidewall is expressed as a percentage of the tyre width. So an aspect ratio of 55 for example means that the profile height of the tyre is 55% of its width.
Rim Diameter
The next two digits represent the size of the wheel rim that the tyre can be fitted to. It is also the diameter of the tyre from bead to bead. So a tyre marked 16 will fit on a 16-inch wheel rim.
Speed Rating
The speed rating of a tyre is represented by a letter of the alphabet at the end of the tyre size code and indicates the maximum speed capability of the tyre. Tyres receive a speed rating based on a series of tests which measure the tyres capability to handle a set speed for a prolonged period of time.
Select your tyre speed rating to find out the maximum speed your tyres can maintain.
If you are unsure what speed rating you need, be sure to check your vehicle handbook. Choosing a lower speed rating than that recommended by your vehicle manufacturer could potentially invalidate your insurance.
Load Rating
The load index provides information on the maximum weight capability for the tyre. The load index is a numerical code that can be located just after the tyre size marking and before the speed rating.
Select your load index to find out the maximum load capability for your tyres.
Although not illegal, it is not advisable to have tyres with a lower speed rating or load index than the manufacturer recommended tyre specification for your vehicle, or to have a combination of different tyre construction types. Consult your vehicle handbook to confirm your vehicle’s tyre speed rating and load index as well as any additional requirements.
0800 75 76 77 You can reach our customer care team 6 days a week from 9:00am to 6:00pm on Monday and Thursday, 8:30am to 6:00pm Tuesday, Wednesday and Friday, 8:30am to 5:00pm Saturday, and 10:00am to 4:00pm on Bank Holidays.
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Select Tyre Size
Front Tyre Size
Rear Tyre Size
We endeavour to ensure we are displaying the correct tyres for your vehicle. However, we recommend all customers check the tyre size printed on the side wall of their tyres before proceeding with a tyre purchase as occasionally discrepancies do occur. By selecting the tyre sizes above and clicking 'Continue', you are indicating that you have checked your tyre sizes.
Please select your front and rear tyre size before clicking 'Continue'.
We have identified the tyre size(s) that may fit your {VEHICLE}. Please select your front tyre size and rear tyre size below before clicking 'Continue'.
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Please note: There is a slope that the vehicle must be driven up to reach the vehicle ramp at this centre. This may prevent us from being able to work on some high-performance vehicles, Tesla vehicles or vehicles that have been lowered. If your vehicle has low ground clearance, please contact the centre team on 01342 314 111 before booking.
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