Ever noticed a code starting with “DOT” on your tyre’s sidewall? That’s more than just a random set of numbers — it’s your tyre’s unique identifier. In this guide, we break down what the DOT number means, how to read it, and why understanding it can help keep your vehicle safe and compliant.
There are various pieces of information that your tyres convey – most of which is found on the sidewall.
At first glance, deciphering this information can be quite difficult. Most of the information is printed as a series of letters and/or numbers, which each relate to a different reading or calculation.
One piece of information is the DOT number – that is, the Department of Transformation number which is akin to a unique serial code for the tyre.
Keep reading for a breakdown on what this number tells you and whether it is really important or not.
What Does the DOT Number Tell You?
The DOT number confirms a few pieces of information that are beneficial to drivers and vehicle owners.
It lets them know firstly where the tyres were manufactured, then when they were manufactured and also what type of tyre they are.
The best way to decipher the DOT number is to look at an example.
But before we do that, you need to a few more things about this code and its purpose.
How Long is the DOT Code?
The length of the DOT code varies – sitting somewhere between 7 and 13 characters.
It always starts with the letters DOT so that you can identify it quickly and easily. The four numbers at the end of the DOT code are usually considered the most important, as they communicate the date of manufacturing.
Of the block of four numbers, the first two indicate which week in the year that the tyre was produced, and the second two share the year itself.
