What do the Numbers on Tires Mean

What do the Numbers on Tires Mean

Safety standards

You may have seen the elaborate code located on the sidewall of your tire. Do not worry, our team will provide you with information on what these hieroglyphs mean. This code has two main functions. The first one is related to the determination of the size and type. The second one is related to the validation that the tyre abides by all safety standards. The letter “E” means that the tyre responds to all European laws for safety.

Tyre code

As we mentioned above, you can find and read the tyre code on the sidewall. It includes information about the width of the tyre, its type, diameter, size, load endurance and maximum speed. You can also find information about the exact date of manufacturing by the so-called “DOT Serial Number”. For example, it may seem “DOT 0417”. The first two numbers symbolize the week of manufacturing while – “04” – the tyre was produced in the 4th week. While the last two numbers symbolize the year of manufacturing – “17” – the tyre was produced in 2017. It is important to understand the DOT serial number when you buy new or part-worn tires.

Load index and speed rating

As we had mentioned, tyre code consists of information about the loading capability and the maximum speed each tyre could handle. Load index displays the maximum weight each tire could handle if it is inflated in the right way. Load index is represented through numbers from 1-150. As higher it is as bigger is the load capacity. For instance, a tyre with index “150” perhaps is suitable for trucks.
Speed rating displays the speed that one tire could endure safely in time. It was created to manage the safety of all vehicles by recommending optimal speed for high durability. The rating is displayed through the letters from A to Z in ascending order. A car with a “Z” rating is perhaps a fancy sports car with a top speed of over 330 km/h.

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