How to read tyre markings
You may have noticed a series of letters and numbers on your tyre sidewall but knowing what these markings mean can be confusing.
Reading tyre markings is essential if you’re looking for replacement car tyres, so it’s important to familiarise yourself with the different sections from tyre construction to aspect ratio.
Keep reading to discover what tyre sidewall markings mean and how to make sense of each of the letters and numbers.
How to read tyre markings
An example of a tyre sidewall marking is 205/55 R16 /91 V. Each section represents a different aspect of the tyre and consists of the following:
Tyre width
The first set of numbers on the tyre reading is the width of the tyre in mm. So, in this instance, the tyre width would be 205mm.
Tyre aspect Ratio
The set of numbers straight after the tyre width refers to the thickness of the tyre wall (or aspect ratio), which is a percentage of the width. So, in this case, 55 would have a height equal to 55% of the tyre’s width. This number is often referred to as the tyre profile.
Tyre Construction
Next, you’ll see a letter following the aspect ratio, which in this tyre marking is an R – this represents the tyre construction. R stands for radial and almost all tyres manufactured today will be radial tyres. Less common tyre constructions include B (bias) and D (diagonal).
Tyre diameter
The next set of numbers after the tyre construction letter, represents the inner diameter of the tyre rim in inches. In the example, the diameter of the tyre rim is 16 inches.
Tyre load rating
The tyre load rating is a numerical code which corresponds to a maximum load (in kg) that can be carried by a single tyre. The load rating and corresponding maximum tyre loads are listed in the table below.
Tyre speed rating
The tyre speed rating indicates the maximum speed at which a tyre can carry its maximum load.
On the sidewall of your tyre (or the sticker in the driver's door, or the owner’s manual), the speed rating is defined by a letter right next to the load rating.
Date of manufacture
You’ll also find another number on your tyre sidewall which represents the date your tyre was manufactured. This will consist of four digits – the first two refer to the week your tyre was manufactured and the last two refer to the year. For example, if the marking on your tyre reads 3820, this means the tyre was made in the 38th week of the year during 2020.
Now you know how to read tyre markings, you can find more information on choosing the best tyres for your vehicle with our dedicated guide.