Many people believe that as long as a tire still has good tread depth or the vehicle has been driven very little, there is no problem continuing to use those tires for many years. However, this is a very common misconception that is important to clarify.
Tire rubber naturally ages over time, even if the vehicle spends most of the year parked. Factors such as sunlight, humidity, temperature changes, ozone exposure, and simple aging can gradually degrade the tire compound and seriously affect safety.
That is why, when buying new or used tires, checking the manufacturing date is extremely important — something many drivers often overlook.
In this article, we explain how to find a tire’s production date, how to read the DOT code, and the risks associated with using old tires.
Why Do Tires Age Even If the Vehicle Is Barely Used?
Tires are primarily made from rubber compounds and chemical materials that naturally deteriorate over time, gradually losing their original properties.
Even if the vehicle:
- is rarely driven,
- stays parked for long periods,
- or has very low mileage,
the tires can still harden and lose important characteristics such as:
- grip,
- flexibility,
- braking performance,
- and structural strength.
This can result in:
- reduced traction in wet conditions,
- longer braking distances,
- sidewall cracking,
- tire deformation,
- and a higher risk of blowouts.
In vehicles that spend long periods parked under direct sunlight or exposed to harsh weather conditions, this deterioration can accelerate significantly.
How to Check a Tire’s Manufacturing Date
All modern tires include a DOT code on the sidewall.
Within that code, you will find four important numbers that indicate the week and year of manufacture.
Example of a DOT Code
DOT XXXX 2223
The last four digits mean:
- 22 = production week
- 23 = year 2023
In other words:
that tire was manufactured during week 22 of 2023.
Another example:
DOT XXXX 1919
This means:
week 19 of 2019.
How Long Can a Tire Last?
There is no single universal rule, since tire lifespan depends on factors such as:
- climate,
- storage conditions,
- driving habits,
- inflation pressure,
- tire quality,
- sun exposure,
- and road conditions.
However, many tire manufacturers and automotive industry organizations generally recommend:
- performing more thorough inspections after 5 years,
- and considering replacement between 6 and 10 years, even if the tire still has good tread depth.
This is because a tire may still look visually “good,” while internally it may have already lost a significant portion of its original performance and safety characteristics.
Signs That a Tire Is Aging
Some common symptoms of aging tires include:
- cracks or dry rot on the sidewalls,
- hardened rubber,
- unusual vibrations,
- frequent pressure loss,
- uneven wear,
- reduced grip in rain,
- and a dry or faded appearance.
If you notice any of these warning signs, having the tires professionally inspected is highly recommended.
Be Careful With “New” Tires Stored for Years
One very important point is that some tires may be sold as “new” even after spending several years sitting in storage warehouses.
Sometimes you may find “new” tires at very attractive prices, but in reality, those tires may already have an old manufacturing date that shortens their remaining useful life.
That is why:
you should always check the DOT date before buying.
In some cases, a tire may already have:
- 3,
- 4,
- or even more years of storage time before being sold.
If storage conditions were poor or the tire is already fairly old, its performance and lifespan may be negatively affected.
Does Climate Affect Tire Aging?
Yes — significantly.
Factors that can accelerate tire deterioration include:
- constant sun exposure,
- high temperatures,
- coastal environments with humidity and salt air,
- long periods without movement,
- incorrect tire pressure,
- and vehicle overloading.
In coastal or very sunny regions, tires can age considerably faster than in milder climates.
Conclusion
A tire’s manufacturing date is a detail many people overlook, but it can make a major difference in both safety and performance.
A tire with good tread depth is not necessarily in good condition if it is already many years old.
Before buying tires, always:
- check the DOT code,
- inspect for possible cracks,
- and consider the tire’s total age, even if the vehicle has very low mileage.
When it comes to automotive safety, tires are one of the most critical components of any vehicle.
