Choosing new tyres can feel like a daunting task, especially with all the numbers and codes involved. But what if we told you the most important piece of information is written right there on the side of your car?
Finding your tyre size is the essential first step to buying new or part-worn tyres, and it is much easier than you think. You do not need any special tools or knowledge, just a few moments to look at your car.
This simple guide will show you exactly where to find your tyre size, what all the numbers and letters mean, and how to use that information to order the correct tyres online with confidence. Let's get started.
Where to Find Your Tyre Size
There are three main places to find your vehicle’s tyre size. The easiest and most reliable is directly on the tyre itself.
1. The Tyre Sidewall (The Best Place to Look)
This is the most accurate method. Walk up to any of your car's tyres and look at the sidewall (the rubber part facing outwards). You will see a series of numbers and letters moulded into the rubber. It will look something like this: 205/55 R16 91V. This is your tyre size code. It is a good idea to check more than one tyre, just in case a previous owner fitted an incorrect size.
2. The Vehicle Handbook
Your car’s owner’s manual will list the standard and optional tyre sizes recommended by the manufacturer. You can usually find this in the 'technical specifications' or 'vehicle data' section.
3. The Car's Information Sticker
Most cars have a sticker inside the driver’s door pillar, the passenger door pillar, or on the inside of the fuel filler flap. This sticker contains information about the vehicle, including the recommended tyre sizes and pressures.
What Each Number and Letter Means
That code on your tyre sidewall might look confusing, but it is a simple system that tells you everything about the tyre's dimensions and capabilities. Let’s break down our example: 205/55 R16 91V.
- 205 (Width): This is the width of the tyre in millimetres, from one sidewall to the other. So, this tyre is 205mm wide.
- 55 (Aspect Ratio): This number is the tyre's profile height, shown as a percentage of its width. In this case, the height of the sidewall is 55% of the 205mm width. A lower number means a lower profile, which you often see on sports cars.
- R (Construction): This stands for 'Radial', which is the standard method of construction for all modern car tyres.
- 16 (Rim Diameter): This is the diameter of the wheel rim that the tyre is designed to fit, measured in inches. So, this tyre fits a 16-inch wheel.
- 91 (Load Index): This number corresponds to the maximum weight that each tyre can safely carry when correctly inflated. It's crucial that the load index of your new tyre is the same as, or higher than, your current one.
- V (Speed Rating): This letter indicates the maximum speed the tyre is certified for. Each letter corresponds to a specific speed (for example, 'V' is 149 mph). You must fit tyres with a speed rating equal to or higher than the manufacturer's recommendation.
Common UK Tyre Sizes
While there are hundreds of different tyre sizes, you will find that some are much more common on UK roads than others. These are often fitted to popular hatchback and family cars like the VW Golf, Ford Focus, and Vauxhall Astra. Some of the most common sizes you will see are:
205/55 R16195/65 R15225/45 R17195/55 R16
At Tyres Doncaster, we stock a huge range of both new and part-worn tyres in all the most common sizes, making it easy to find what you need.
Simple Mistakes to Avoid
Getting the tyre size wrong is a common but easily avoidable mistake. Here are a few pitfalls to watch out for:
- Guessing the Size: Do not assume you know your tyre size. Always check the sidewall or your handbook. Even different trim levels of the same car model can have different tyre sizes.
- Ignoring Load and Speed Ratings: The size is only part of the story. You must also match or exceed the load and speed ratings. Fitting a tyre with a lower rating is dangerous and could invalidate your insurance.
- Only Checking One Tyre: It is always wise to check the size on at least two tyres (one front, one rear) to ensure they are all the same. Sometimes, cars can have wider tyres on the back axle.
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Mixing Up Numbers: Double-check the numbers before you order. It is easy to mix up a
55profile with a65, but this will result in a tyre that does not fit or perform correctly.
A Quick Note on Specialist Tyre Markings
You might see other letters or symbols on your tyres. Here are a few common ones:
- Run-Flat Tyres: Often marked with symbols like RFT, ZP, or SSR. These tyres have reinforced sidewalls that let you drive for a short distance after a puncture.
- EV Tyres: Tyres designed for electric vehicles may have markings like 'ELECT' to show they are built for higher weight and lower noise.
- SUV Tyres: May be marked HT (Highway-Terrain), AT (All-Terrain), or MT (Mud-Terrain) depending on their intended use.
How to Order the Correct Size Online
Once you have your tyre size, ordering from Tyres Doncaster is incredibly simple.
- Go to our website: Navigate to our homepage.
- Enter Your Size: Use our intuitive search bar to type in your tyre size (e.g., '205/55 R16').
- Browse the Results: Our website will show you all the new and high-quality part-worn tyres we have in stock in that size. You can filter by brand, price, and more.
- Add to Basket: Select the tyres you want and add them to your basket.
- Checkout Securely: Enter your delivery details. We offer fast, reliable delivery to any address across the UK. If you are local to us, you can also opt for our professional fitting service at our Doncaster hub: Trafford Way, Doncaster, DN1 3BX.
Tyre Size FAQs
Q: Can I fit a different size tyre to my car?
A: It is strongly recommended to stick to the sizes approved by your vehicle's manufacturer. Fitting an incorrect size can affect your car's handling, speedometer accuracy, and safety.
Q: What happens if I order the wrong size?
A: The tyre simply will not fit your wheel rims correctly. This is why checking your size carefully before ordering is so important. Most online retailers have returns policies, but it is much easier to get it right the first time.
Q: Do all four tyres have to be the same size?
A: On most standard cars, yes. However, some high-performance cars have a 'staggered' setup, with wider tyres on the rear axle than the front. Check the sidewalls on both your front and back tyres to be sure.
Q: Does the brand matter more than the size?
A: The size is the most critical factor, as an incorrect size will not fit. Once you have the right size, you can then choose a brand that suits your budget and driving style.
Now that you know how to find your tyre size and what it all means, you have the most important tool you need to shop for tyres like an expert.
