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Tire Tread Depth: Legal Limits and What to Know

A tire is designed to meet performance requirements. But beyond a certain level of wear, it needs to be changed. What is the role of the tread? Up to what level of wear does the tire remain effective? And what is the legal minimum tread depth for changing your tires? Find out the answers to all your questions.
    • 17/03/2025 -  Updated on 06/07/2026

The performance of a tire

The primary functions of a tire are to carry a load and to allow the vehicle to accelerate, brake and turn. But beyond its functions, a tire is chosen for the performance you expect from it, which is relative to your use.

It is the way a tire is designed that will make it perform better under certain conditions than others. And to achieve specific performance, it is the tread that plays a decisive role.

The sculpture's grooves on the tread surface are essential to perform. Depending on their design, they will be more effective in certain conditions, on snow, on dry or wet roads.

The tire's tread depth also plays a role in performance. For example, it is important for water drainage when driving on wet roads. This ensures that the tire maintains contact with the ground and postpones the aquaplaning effect to higher speeds.

tyre tread water

What is the tread depth of a new tire?

This will depend on the tires and the choice of manufacturer, but here is what is important to know: the tread pattern should be thick enough to ensure a long life for the tire.

However, if the tread is too deep, it will also consume too much energy during driving, and therefore fuel, because of the heat released by the rubber when it deforms.
This is why the tire's tread depth is designed by the manufacturer to find the best balance between the life of the tire and the fuel consumption related to tires. 

What is the legal tire limit of the tread depth?

The minimum tread depth is 1.6 mm. This means that it is imperative to change your tires once this limit has been reached to avoid compromising your safety and breaking the law. 
But it also means that it is premature to change your tires before this threshold. This paragraph explains how to check if the wear level is reached.

At Michelin, we design tires with performances made to last.
That is, they are able to provide an excellent performance right up to the last kilometre, when the wear threshold is reached.

There are two main reasons why Michelin optimizes the longevity of its tires: less frequent tire changes save you money and are more environmentally friendly.

This is why Michelin designs tires that perform well until the minimum tread depth is reached. 

Tire tread check

Professionals use a specially designed tool to check the legal tire limit of the tread, known as a tire gauge. If you are not equipped with one, you can easily find out the wear level of your tire thanks to the wear indicators, which are identified on Michelin tires by a small Michelin man. 

When the tread wear level reaches the wear indicators (which define the legal tire limit), it is time to change your tire.

Do you need to change your tires?

Малките издатини при гумите Michelin Ви помагат да откриете индикаторите за износване върху протектора.
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In most Canadian provinces, the legal minimum tread depth for all-season and summer tires is 2/32 of an inch (1.6 mm). For winter tires, Transport Canada and most provinces recommend a minimum of 4/32 of an inch (3.2 mm), as tires below this threshold lose meaningful snow and ice grip even if they're technically above the legal limit. At 2/32", stopping distances on wet or snowy roads increase significantly—so treating the legal minimum as the safe minimum is not advisable. 

The simplest method is the coin test. In Canada, use a quarter: insert it into the tread groove with the caribou nose pointing down. If the nose tip is completely covered by tread, you're above 6/32". If it's visible, your tread is getting low. A tread depth gauge (available at any auto parts store for a few dollars) gives a precise reading and is the most reliable method. Also check for the wear indicator bars moulded into the tread grooves—when the tread surface is level with these bars, you're at the legal minimum. 

  • Center wear: Tires overinflated 

  • Edge wear: Tires underinflated 

  • One-sided wear: Wheel misalignment 

  • Cupping or scalloping: Worn shock absorbers or struts 

  • Feathering: Toe misalignment 


Don't just replace the tire without addressing the root cause—the same issue will wear out the new tire just as quickly. Get an alignment check and have your suspension inspected if you see uneven wear patterns. 

It depends on the tire type and driving conditions. A typical all-season passenger tire lasts 60,000–100,000 km. High-performance summer tires may wear in 30,000–50,000 km due to their softer compound. Winter tires generally last 4–6 seasons with seasonal use. Driving style has a big impact: hard acceleration, heavy braking, and aggressive cornering all accelerate wear. Regular rotation (every 10,000–12,000 km) and keeping tires at the correct pressure are the two most effective things you can do to maximize tire life. 

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