Each of these digits/letters represents something different and provides important information. When it comes to how to read tyre size, the first seven digits of the code are the most important. Tyre Width, Profile, and Diameter.
Hover over the image to see what element of the tyre labelling means
The first three digits belong together and indicate the width of the tyre (in millimetres).
The two digits following the first slash are what is known as the aspect ratio, or 'profile'. Essentially this is the height of the tyre as a percentage of the width.
This stands for the tyres specific type of construction. Most tyres are marked R for Radial. It means that the steel belt inner construction is angled at 90 degrees to the direction of travel, resulting in extra strength. Almost all new car tyres are radials.
The two digits following the first slash are what is known as the aspect ratio, or 'profile'. Essentially this is the height of the tyre as a percentage of the width.
This is the maximum load that the tyre is able to carry when inflated to the correct level. Each double digit number represents a different weight (in KGs). Overloading any vehicle is dangerous and can increase fuel consumption, impact on handling, and can even occasionally cause catastrophic tyre failure.
The final letter represents the Speed Rating of the tyre. This is the maximum speed that the tyre can cope with under its maximum load. Each letter represents a corresponding speed.
It is important to know exactly what is meant by tyre size. The code that is found on the tyres gives more than just the basic size. The size elements are essentially the tyre’s height and width. Tyre sizes will also vary depending on the type of vehicle i.e. van and lorry tyres tend to be larger/chunkier than car tyres.
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