Find Your Tyre Size & Search By Reg
Tip: You can find your tyre size on the sidewall of your current tyre, in your vehicle’s handbook or on a sticker in the door jam or fuel cap.
Use our tool below to understand how to read and find your tyre size by dimensions, as you select each size the relevant section of the tyre size will be highlighted on the tool. Alternatively, you can search by vehicle reg which will display a set of tyre size options to chose from.
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Tyre Sizes Explained
Width: This is the overall width of the tyre, represented by the first 3 digits on the sidewall of the tyre. Wider tyres offer better grip, but can create excessive amounts of road noise.
Profile: The 'aspect ratio' of the tyre is the height of the tyre’s sidewall divided by the width of the tyre, multiplied by 100. In our example, this means that the overall tyre profile is 55% the size of the tyre’s width.
Rim: If you removed a wheel’s tyre, you would be left with the wheel rim. The width of the rim may vary slightly from the width of the tyre, which is why there the two dimensions are given separately.
Speed Rating: The speed rating is a letter which indicates the maximum speed at which the tyre can carry the load corresponding to the load capacity index. In our example, a “V” rating can cope with speeds of up to 148 mph.
Load Index: The load capacity index represents the maximum weight the tyre can carry at the speed indicated by the speed rating symbol. In our example, the tyre has a load index of 91, meaning it can support up to 615kg.
Extra Load (XL): Some vehicles require tyres that are rated to carry a higher load and therefore have a higher inflation pressure. This information can be found on the tyre sidewall marking and is marked as Extra Load (XL) or Reinforced (RF).
Runflat: Runflat tyres are made in reinforced sidewalls which carry the weight of the vehicle in the event of pressure loss. This ‘Self-Supporting’ Tyre Technology is typically found on BMWs and Minis and enables you to continue your journey with a flat tyre for up to 50 miles at up to 50 miles an hour.
How To Read Tyre Size
You can find your car’s tyre size written on the sidewall of your current set of tyres, in your vehicle’s handbook or on a sticker in the door jam or inside the fuel cap door. When buying new tyres you should only go for ones that have these same numbers to ensure a good fit.
When looking at your tyre sidewall you will see a set of numbers as outlined in the tool above. This is your tyre size.
Simply read the number from left to right, the numbers relate to the different aspects outlined above.
For example, if our technician asked you what the rim size of your tyre was, this would be noted on the sidewall as R16 or R17. Thus you could say your tyre is a 16 or 17 inch.
If you're speaking to a technician you can simply read of the tyre size in on go and they will understand the size you need an be able to advise on the most suitable tyre for your driving style and budget.