Every tyre sold for road use in the US carries a DOT code on its sidewall. The code starts with the letters DOT and identifies the manufacturer, the plant, and the tyre type. The last four digits show the week and year the tyre was made, which tells you its age. This guide explains where to find the DOT code on a Michelin tyre, how to read the date code, and why tyre age matters.
Where to find the DOT code
The DOT code is moulded into the sidewall, usually on the outer side when the tyre is fitted to the vehicle. It is often near the rim, so a torch and a clean cloth can help. The full code is normally on the sidewall that faces outward, so check both sides if needed.
How to read the date code
The date code is the last group of numbers in the DOT code. For tyres made since 2000, it is four digits: the first two show the week of manufacture, from 01 to 52, and the last two show the year. For example, 2419 means the 24th week of 2019. Tyres made before 2000 have a three-digit date code, which usually means the tyre is well past its normal service life.
Why tyre age matters
Rubber ages even when a tyre is not used. Heat, ozone, sunlight, and time harden and crack the compound, which reduces grip and can cause failure. Many manufacturers advise replacing tyres after a set number of years, often around six to ten years from manufacture, regardless of tread depth. Check the guidance for your specific tyre.
Checking tyres before you buy
When buying Michelin tyres, check the date code before fitting, and ask the supplier for recently made stock where possible. A tyre that has been stored for a long time may already be several years old.
Storing and caring for tyres
Store tyres in a cool, dry, dark place, away from direct sunlight, heat, oil, and fuel. Keep them upright or stacked neatly. Inspect the sidewall regularly for cracks, bulges, and cuts, and replace any tyre that shows damage, whatever its age.
Frequently asked questions
Where is the serial number on a Michelin tyre? The DOT serial number is on the sidewall, with the date code at the end.
Can I use a Michelin tyre that is more than ten years old? Many manufacturers advise against it, even if the tread looks good. Check the guidance for your tyre and have a qualified fitter inspect it.
Does the DOT code tell me the tyre size? No. The DOT code shows manufacture details and age. The tyre size is printed separately on the sidewall.
Get help with your tyres
For more on choosing and caring for tyres, read our tire guides. If you are not sure how old your tyres are or whether they should be replaced, contact us and we will help you check.