Basic knowledge of winter tires I want to know before snowfall

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Winter has arrived! Basic knowledge of winter tires I want to know before snowfall

The snowfall season has arrived! Prepare winter tires soon!

Finally, December is getting close, and in some areas, the snowfall begins. Not only in cold areas but also in areas that are not so, it is about time to prepare for winter tires.

So this time pick up articles about winter tires! Let’s send a safe and secure car life with early winter preparation.


A normal tire on the snow road is a suicidal act! Times of a studless tire

The first thing to introduce is an article introducing how dangerous it is when running on snowy roads with normal tires. This is based on the tests performed by JAF, and the running distance and the braking distance were measured by snow-covered road and frozen road with normal tire and studless tire, respectively.

As a result, it was found out how dangerous the running on normal tires is. That braking distance was twice as great as a studless tire (when driving on snow).


With all season tires, Is there a performance difference with studless tires?

All season tire that is often compared with studless tires. As its name suggests it is able to keep wearing in summer winter, and if it is a small amount of snow/ice it has the effect of preventing slip.

However, what I care about is performance difference from studless tires. If there is no difference in performance, there may be many people who wish to finish with all-season tires, but is there such a good story?


With all season tires | Is there a performance difference with studless tires?

【Thorough comparison】 All season tires and studless tires

The difference in performance on a snowy road
If all season tires and studless tires are shallow snowy roads, snowy roads, sherbet like snow, there is not much difference in running stability. However, as the number of snowfall increases, studless tires can run more consistently as the performance is better.

The reason is that while the all-season tire uses rubber that corresponds to the hot summer from the snow road, the studless tire uses the material assumed only for the winter snow road running, and the snow road specific It is because it is devised to respond to the situation of the road surface. If it is a little snow, you can do it all season tire, but as the amount of snow increases, it may run with all season tires even if you can run with studless tires.

Therefore, if you live in a city center where the amount of snowfall is usually low and go out to winter skiing and snowboarding, in winter we recommend wearing studless tires rather than all season tires.

The performance difference in ice burn

When comparing the performance of all-season tire and studless tire, the most difference is the braking force (when braking is applied) when running on ice burn (on ice). The cause of sliding in ice burn is not the ice itself, but a film of water that can be formed between ice and tire.

The studless tire makes it difficult to slip by sucking water like a syringe by many grooves on the surface of the tire and grounding it without following the road surface from which water was removed. And it is a mechanism to stop by scratching at the edge of the narrow groove.

Moreover, by adopting special rubber which does not harden even in winter, the studless tire can also stop the tire firmly catching the road surface even in ice burn.

One all season tire adopts rubber that can also handle hot summers, so I can not go straight on a slippery road like ice burn and it will not go straight and it will be tough to stop at the desired speed by applying a brake I will.

It is the braking force that gives the most difference, but it is also difficult to convert and maintain the direction by steering wheel operation among the four functions of the tire introduced first. Even if the steering wheel is turned off, the car does not bend as expected and the car may slip.

In regions where the cold is severe in snowy areas and the road surface is harsh, wearing studless tires is indispensable in winter.

【Thorough comparison】 All season tire and summer tire

The difference in performance on a snowy road
The summer tire boasts outstanding stability on a dry road surface. And it demonstrates sufficient braking power even on wet roads due to rain etc. However, running on the snowy road slips, making it difficult to travel as you want.

Why does summer tire slip on the snow road because the rubber used for the tire hardens due to the temperature drop and it can not capture the road surface firmly.

For all season tires, the grip on dry or wet road surface can not overcome summer tires, but if it is shallow snow, snowy roads, and sherbet like snow road, you can travel safely without slipping Is possible. That is because all-season tires are made of special rubber which does not cure even when the temperature drops.

This results in performance differences that can not be compared with summer tires.

The performance difference in ice burn
It is impossible to run a summer tire on ice burns where the road surface is frozen. The tires slip and become uncontrollable.

Basically, if you are likely to drive ice burn, avoid summer tires and all-season tires, wear studless tires and let’s leave. If you can not drive on the road before you arrive at your destination, you will cause inconvenience to many people.

Whether all season tires can run even on the road of chain regulation
When the chain regulation due to snowfall is issued on a highway etc., all season tire can run depending on the product. For all-season tires that can run even with chain regulations, snowflake marks certified as winter tires in Europe are stamped on the side. If this mark is present, it is proof that it corresponds also to the chain regulation of expressway.

However, with all vehicle chain regulations, it is imperative to install a chain with any tires (including studless tires). In the case of general chain regulation, all season tires and studless tires can run without installing a chain.

Please tell us that there is a snowflake mark when you check on the parking area etc when regulating expressway chain.

The lifetime of all season tire

How long is the life of the all season tire?
Estimated lifetime of summer tire is said to be 4 years. This guideline changes greatly depending on the usage environment.

Estimated lifetime of the all-season tire using special rubber material is about 3 to 4 years. In general, the rubber used for the tire will harden progressively due to aged deterioration. However, since the all season tire uses special materials, it is better to think that the service life is somewhat shorter than the summer tire.

Of course, there are periods of 3 to 4 years, but there is also a lifetime due to mileage. Mileage is a standard between 4 and 50,000 km. People with a large mileage for the year are better not to replace 3 to 4 years, but to change the mileage as a guide.

How to identify lifespan of all season tire
In order to know the lifespan of the all-season tire that it is wearing, let’s first see the condition of wear. The surface of the tire will decrease according to the mileage. If the groove on the surface becomes less, the drainage becomes worse and it becomes easy to slip.

It is a slip sign at the back of the groove that becomes a standard of exchange. The slip sign is exposed when the retaining groove of the tire becomes 1.6 mm. This slip sign is a sign indicating the limit of use of the tire decided by law, so if this sign is out it will not pass through the vehicle inspection and must be replaced.

In addition, the tire prevents cracks due to the oil contained in the rubber of the material. However, as the tire becomes older, it becomes easier for oil to escape and crack. Check the tires a little and check for cracks and cracks.

Failure to do so will cause bursts (rupture of tires) during high-speed driving, which is a very dangerous cause of traffic accidents.


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