Recognizing Tire Age: Reading and Correctly Assessing the DOT Number

The direct answer: The date of manufacture of your tire is in the DOT number on the tire sidewall – specifically in the last four digits. The first two digits are the production week, the last two are the production year. So, "3224" means: 32nd calendar week of 2024, manufactured at the beginning of August 2024. You don't need anything else to determine the age. Everything else in this guide revolves around the more difficult question behind it: How old can a tire be, how do you recognize genuine aging – and when is a tire due for replacement despite good tread? Legal status and review date: August 2026, Germany.

1. Reading the DOT number: count the last four digits

The DOT marking is an identifier from the US tire regulation, which is found on virtually every passenger car tire sold in Europe. It begins with the letters DOT and consists of several blocks: an identification of the manufacturing plant, manufacturer-internal size and type codes, and at the very end, the date code. Only this last block is relevant for determining the tire's age.

The logic is simple:

• First two digits = production week (01 to 53).
• Last two digits = production year (two digits).

Examples, calculated as of August 2026:

A common misconception: Many read the date code as month and year. However, "3224" is not a 32nd month – the first number is always the calendar week. If you want to roughly translate the date into a month, divide the week by 4.3. Week 32 would then be around early August, week 45 early November.

Note: The date code says nothing about the quality of the tire. It merely documents when the tire left production. A properly stored tire from the previous year is superior to a poorly stored tire from this year – age is an indicator, not a judgment.

2. Where the DOT number is located – and why often only on one side

The DOT marking is embossed into the tire sidewall, usually in a slightly recessed rectangle or oval, typically closer to the rim shoulder than to the tread. It is not color-marked, but only recognizable as a relief in the black rubber surface – on dirty tires, it is only visible after wiping. A cell phone flashlight at a shallow angle makes the embossing much easier to read than direct light from the front.

And now the point where most people get stuck: The complete DOT marking, including the date code, is usually embossed on only one of the two tire sides. On the opposite side, you often only find an abbreviated version – the manufacturer's identification and type codes, but without the four date digits. So if you find a DOT number on the outside of your wheel that ends conspicuously short, you haven't found the wrong spot: You're simply on the wrong side of the tire.

The reason lies in manufacturing. The date code is applied late in the process and must therefore be located in a replaceable insert of the vulcanization mold. The regulation requires the complete marking only once per tire; on the opposite side, the partial marking is sufficient. Which side this is decided by the manufacturer – and on a mounted wheel, this can be the inside.

Here's how you can still access it:

1. Turn the steering wheel fully. On the front axle, this makes the inner sidewall clearly visible from the outside – this is usually sufficient.
2. Shine a light from behind. On the rear axle, a flashlight between the wheel arch and the tire helps; often, the embossing can be felt and then photographed.
3. Photo instead of headstand. Hold your phone flat under the wheel arch, turn on the flash, take a burst of photos – then read them calmly on the display. Saves back pain and misreadings.
4. Note it down at the next wheel change. The easiest way is when the wheel is already removed. How to proceed systematically is described in the guide Changing and storing wheels.

For stored spare wheels, a little extra effort is worthwhile: Note down the DOT number and installation position with chalk or a sticker when removing them. Then you'll never have to crawl again, and you'll see at a glance which set is older.

3. Older tires with a three-digit marking

Tires manufactured before 2000 have a three-digit date code: two digits for the week, a single digit for the year within the decade. "329" therefore means the 32nd week of a year ending in 9 – without additional information, it's not possible to distinguish whether 1989 or 1999 is meant. Some manufacturers in the 1990s added a small triangle after the code to identify this decade.

Practically, the distinction is now secondary: A tire with a three-digit code is at least 26 years old. Such tires are still found on classic cars, on trailers that have been parked for a long time, on spare wheels that have never been used, and occasionally in basement finds. They no longer belong on a regularly used vehicle, regardless of how much tread is left and how good they look visually. The rubber compound has lost its original properties after such a long time.

4. How old can a tire be? The honest legal situation

A lot of half-knowledge is spread here, so it's clearly separated into regulation and recommendation.

What is regulated

For passenger car tires in Germany, there is no general legal age limit. There is no rule according to which a tire with a certain DOT date automatically becomes invalid. Instead, the condition is decisive: The Road Traffic Licensing Regulations require that the tires are in proper condition and prescribe a minimum tread depth of 1.6 mm. An old but intact tire can meet these requirements – a two-year-old tire with cracks or structural damage does not.

During the main inspection, the tire age is therefore not assessed as an independent defect. What the inspection body actually sees on the tire is assessed: tread depth, cracks, damage, deformations, correct size and load capacity. Visible signs of aging lead to a complaint – the DOT date alone does not.

Where there are fixed deadlines

Special rules exist, but not for normal passenger cars. The practically most important case concerns trailers with 100 km/h approval: For the approval to drive a combination with up to 100 km/h, the relevant exemption regulation requires, among other things, that the tires of the trailer are no older than six years at the time of driving. Here, the DOT date is thus directly legally relevant – and this applies to every journey, not just at registration. Anyone driving a caravan or horse trailer with a 100 km/h sticker should therefore keep an eye on the DOT. Further age-related requirements exist in special areas such as the transport of dangerous goods; they play no role for private passenger cars.

Note: Legal requirements change. The status described here is August 2026 for Germany. For your specific case – especially for trailers, 100 km/h approval, and commercial use – always check the currently valid version of the respective regulation. This article is not a substitute for legal advice.

What is recommended

Regardless of the legal situation, there is broad professional agreement that you can use as a guide. Vehicle and tire manufacturers, as well as trade associations, usually recommend having tires regularly professionally inspected after about six years and replacing them at the latest after about ten years – even if there is still plenty of tread left. The exact values differ depending on the manufacturer; the information in the vehicle manual or from the tire manufacturer is always decisive.

This table is deliberately formulated as a set of recommendations. It does not replace individual case assessment: A vehicle that stands outside in the sun all year round ages faster than one in an underground garage; heavy loads, many short journeys, and persistently incorrect tire pressure further accelerate the process. The guide Setting tire pressure correctly explains how much tire pressure plays a role.

View matching tires in the ZR Shop →

5. Recognizing aging: what you actually see on the tire

The DOT date is only half the truth. What is crucial is how the tire has actually aged – and you can largely assess that yourself.

The background in short: A tire compound contains plasticizers and anti-aging agents. Both slowly migrate to the surface over the years and are degraded – driven by oxygen, ozone, UV radiation, and heat. The result is a harder, more brittle compound. A hard tire grips the road less effectively, builds up grip later, and significantly extends the braking distance, especially in wet and cold conditions – a connection that the guide Braking distance: what does it depend on? explains in detail. Movement counteracts this: A regularly driven tire keeps its protective agents active longer than one that stands still for years.

Two clarifications on this. First: Not every visible crack means the tire is unsafe – a slight crimping of the sidewall surface can be harmless. The boundary between cosmetic and critical can only be reliably determined by a specialist workshop that can also assess the tire from the inside and without the rim. Second: Deformations after long periods of standing often disappear after a few kilometers as the tire warms up. If a vibration persists, the guide Balancing tires can help with troubleshooting.

6. New tires with an older DOT: what you should know

When buying tires, the question regularly arises as to why a brand-new tire carries a DOT date that is one or two years old. The explanation is unspectacular: The aging clock starts at production, not at assembly – and there is always a storage period between production and sale. Tires are produced in batches, distributed worldwide, and then stocked. This is normal trade and not a defect.

This is particularly pronounced for dimensions that are produced in small quantities: special sizes, off-road oriented profiles, sizes for motorhomes, vans, and pickups. An AT tire in a rarely demanded dimension will inevitably be in stock longer than a mass-produced size for a compact car. The comparison AT, MT, or HT tires categorizes which types of profiles are in demand in what quantities.

From a technical perspective, what's crucial isn't just the date, but the storage conditions in between. Properly stored tires – cool, dry, dark, depressurized, away from ozone sources – age very slowly during this time. This is precisely why an unused, correctly stored tire is usually sold as a new tire in the industry several years after production. There is no generally binding legal upper limit for the DOT age when buying new tires in Germany.

What you can practically do with this:

• Ask for the DOT before buying if the date is important to you – especially for tires you plan to drive for a long time.
• Keep all four tires in mind. More useful than the freshest possible date is a similar date on an axle – tires of the same age behave similarly.
• Stay calm with special sizes. An older DOT is the rule there, not the exception.
• Ask about storage, not just the date. That's the more relevant information.

Note: An older DOT is not a judgment on the seller's quality. Storage times result from production batches and demand. We are not evaluating providers here, but describing how the market works – so you can correctly classify the date.

7. Storage: the biggest lever against premature aging

There can be a significant difference in condition between two tires of the same age – and this almost always arises during the period of inactivity. Anyone who stores their winter or summer tires incorrectly for half a year wastes lifespan that no DOT date can restore.

The four factors that matter:

• UV radiation: Direct sunlight degrades the rubber surface and bleaches it. Tires should be stored in the dark, not on the balcony or against the south wall of the garage.
• Ozone: Ozone attacks the surface and is the main cause of fine sidewall cracks. Electric motors and some electrical appliances produce ozone – therefore, do not place tires near operating equipment.
• Temperature: Heat accelerates every chemical aging reaction. Cool and evenly tempered is better than warm or fluctuating wildly; avoid direct proximity to heat sources.
• Standing time and load: A tire that stands for months under vehicle weight in the same spot will deform. For longer periods of inactivity, it helps to slightly increase the tire pressure and occasionally move the vehicle.

Then there's the storage method: complete wheels are stacked lying down or hung, while tires without rims are stored standing up and rotated regularly. The complete instructions, including cleaning, pressure adjustment, and labeling, can be found in the guide Changing and Storing Wheels; for the rims themselves, it's worth checking Cleaning and Caring for Rims before storage, as road salt residue can attack the surface over the summer.

One special case is worth mentioning: for vehicles with low annual mileage, age is almost always the limiting factor, not wear. Motorhomes, trailers, seasonal vehicles, and second cars regularly reach the ten-year mark with almost new tread. For these vehicles, DOT inspection is more important than tread measurement.

8. Tire age and tread depth: two criteria, one result

Age and tread depth are independent wear factors, and for replacement, the rule is: the worse criterion decides. A tire with 6 mm tread and thirteen years on its back is just as due for replacement as a two-year-old tire at the 1.6 mm limit. Practically, you check both in one go: once around the vehicle, measure tread, read DOT, inspect sidewalls.

The legal minimum tread depth, the recommended limits for summer and winter tires, and the measurement methods are covered in detail in the guide Measuring Tire Tread Depth – everything about tread is there. This article focuses on age. What connects both: you can read both values fastest during the seasonal wheel change when the wheels are off anyway.

If it turns out that a set is due for replacement, you next need the appropriate size and load capacity. The guide Reading Tire Size and Tire Designation deciphers the designation on the sidewall, and the Load Index Table clarifies the load capacity question – especially relevant for vans, motorhomes, and pickups.

FAQ: Tire age and DOT number

Where can I find the manufacturing date of my tires?

In the DOT marking on the tire sidewall, usually in a recessed rectangle near the rim shoulder. The last four digits are the production week and year. The complete marking with the date code is often only embossed on one side of the tire – turn the steering on the front axle or check the wheel during the next wheel change.

What does DOT 3224 mean?

"3224" stands for the 32nd calendar week of 2024, i.e., early August 2024. The first two digits are always the week, the last two the year – it is not a month indication.

How old can tires be according to the law?

For passenger car tires in Germany, there is no general legal age limit. Proper condition and at least 1.6 mm tread depth are required. Manufacturers and trade associations usually recommend an inspection after about six years and replacement after about ten years. A fixed deadline, however, applies, for example, to trailers with a Tempo 100 approval: there, the tires must not be older than six years at the time of driving. As of: August 2026.

Are new tires with a two-year-old DOT still okay?

Generally yes. Aging begins with production but proceeds very slowly with proper storage – cool, dry, dark, and pressureless. Storage times of one to two years are common, especially for special sizes. More important than the freshest possible date is that the tires on one axle have a similar age.

Conclusion and next step

Identifying tire age is a two-minute task: find the DOT number, read the last four digits, note the week and year. The evaluation requires a little more thought – because there is no general legal age limit for passenger car tires. Use the six to ten-year range as a guide, simultaneously check sidewalls and tread base for cracks and hardening, and if in doubt, have a specialist workshop inspect them. For vehicles with low mileage, age is almost always the criterion that takes precedence.

If a replacement is due, you'll find tires and pre-assembled complete wheels in the ZR Shop – the latter makes seasonal changes significantly easier and saves you the annual remounting, which puts additional strain on the tire sidewall. The correct size for your vehicle can be found in the vehicle registration document; for winter operation, the winter complete wheel guide can help.

Discover tires in the ZR Shop → · Tires · Off-road tires

Matching topics

• All-season tires: for whom they are worthwhile
• Winter tire requirement in Germany and abroad

Sources and status

• US Tire Identification (Tire Identification Number, DOT marking) – Structure of the marking, four-digit date code since 2000, three-digit code before that, complete marking on one side of the tire
• Road Traffic Licensing Regulations (StVZO), § 36 – Requirements for tires and minimum tread depth of 1.6 mm; no general age limit for passenger car tires
• Exemption regulation for Tempo 100 approval for trailers – Maximum age of trailer tires of six years at the time of driving
• Information from vehicle and tire manufacturers and trade associations – Recommendations for inspection from about six years and replacement after about ten years (manufacturer's specification, self-serving; the respective vehicle manual is authoritative)
• Fundamentals of tire technology – Rubber aging due to oxygen, ozone, UV radiation, and heat, storage requirements

Note: Legal status and inspection date: August 2026, Germany. Information on age limits and recommendations may change. This article does not replace legal advice or a vehicle-specific inspection by a specialist workshop.