How do you check a tyre’s date of manufacture (DOT) and what does it mean?

Where on the tyre can I find the DOT code and the date of manufacture?

On the sidewall of the tyre, you will find the DOT code – a key marking that indicates the date of manufacture. Look for the word ‘DOT’, followed by a sequence of letters and numbers. The last four digits of this sequence are the date of manufacture. On many tyres, the full date code is only found on one side. If you cannot see the four digits on the outer side, check the inner side of the tyre. The date is sometimes placed within an oval frame. Wash the sidewall of the tyre and use a torch to read the markings more clearly.

How do you decode the four-digit DOT code and work out the week and year?

To decipher a four-digit DOT code, bear in mind that the first two digits indicate the week of manufacture and the next two the year. The first two digits represent the week, and the next two the year. Example: 0125 stands for the first week of 2025. For example: 3625 refers to the thirty-sixth week of 2025. This four-digit standard applies to tyres manufactured from 2000 onwards. The date refers to the time of manufacture, not the time of purchase.

What do shorter or illegible markings on a tyre mean?

If you see ‘DOT’ and a string of characters without the four digits at the end, this usually means you are looking at a tyre without a moulded date. Check the other side of the tyre. The three-digit date code was used on tyres manufactured before the year 2000. Such a tyre is now very old and should not be used. If the digits are worn away or painted over, try gently cleaning the sidewall of the tyre and use a brighter light.

How can you check a tyre’s age if the production number is illegible?

• Check the inside of the tyre using a mirror and a torch.
• Turn the dial so that it is easier to read in a place where there is more light.
• Ask the service centre to remove the wheel or move the tyre onto the rim so that you can see the DOT code.
• If you cannot determine the date, treat the tyre as unreliable. Assess its visual condition and, if in doubt, consult a tyre repairer.
• A professional service centre can also check tyre wear, balance, the condition of the rims and the operation of the TPMS whilst they’re at it.

How does the age of a tyre affect safety, regardless of the tread depth?

Rubber ages over time. Oxidation, UV radiation, ozone and temperature fluctuations cause the compound to harden and develop micro-cracks. Even with sufficient tread depth, braking distances increase, grip on wet surfaces and at low temperatures decreases, and the tyre absorbs road irregularities less effectively. As tyres age, the risk of deformation, noise and failure at high speeds or under heavy loads increases. Therefore, the age of a tyre has a real impact on safety and comfort, regardless of the tread depth.

When should you replace a tyre based on its date of manufacture?

Manufacturers’ recommendations vary, but it is standard industry practice to carry out a thorough inspection of tyres after around five years’ use and not to use very old tyres, even if they still have tread. Replacement is advisable if there are visible cracks, fissures at the bead, bulges, flaking, uneven wear, or if the tyre has been stored incorrectly for a long time. It is worth remembering that the minimum tread depth required by law is 1.6 mm, but in the case of winter tyres, higher values are generally accepted as a practical guide to effective grip. Ultimately, the decision depends on the condition of the tyre, how the car is used and the manufacturer’s recommendations.

Can you trust second-hand tyres, and how can you assess their age before buying them?

Second-hand tyres They may be a good option if they are young, healthy and come from a reliable source. Before buying:

• Check the DOT code on each tyre individually. Pair tyres of similar age and tread depth.
• Check the sidewalls and tread. Avoid tyres with cracks, bulges, signs of overheating or corrosion of the steel cord.
• Check that the tyre has not been repaired in critical areas. Some types of damage make it unsafe to use.
• Ask about storage conditions. A cool, dark and dry place slows down the ageing process.
• After buying second-hand tyres, have them fitted and balanced.
• The service centre can also check the wheel rims and the TPMS system.

Please note that fitting and balancing are free of charge for new tyres, in accordance with the shop’s terms and conditions. You will be given details of this service at the time of purchase.

How can you quickly check and note down the age of your tyres before setting off?

• Take a torch and look for the ‘DOT’ marking on the side of each tyre, including the spare.
• Write down the last four digits, for example 0125. These represent the week and year of manufacture.
• Calculate the tyre’s age. Assess whether its condition and age are suitable for the intended load and speed.
• Take photos of the codes and save them on your mobile phone or in the car’s service log.
• Whilst you’re at it, check the tyre pressure, whether the tyres are wearing evenly, and that the TPMS is working properly.
• If you’re in any doubt, visit a 24-hour tyre repair service. If necessary, use the mobile tyre repair service.

Knowing the DOT code is a quick way to assess the risks before the season starts and before setting off on a journey. It’s not just about regulations and tread depth, but about actual grip and handling confidence. Regularly checking the age and condition of your tyres saves you stress, time and money over the course of a year, particularly when the car is carrying a load or driving in variable conditions.

Book a tyre check with DOT number reading today!