The safety of driving a car depends on many factors, but one of the main ones is the condition of the tires, the height or depth of the tread. It is tires, taking into account seasonality - summer and winter, that provide excellent grip on the surface of the roadway.
Tires are very different, depending on the transport for which they are selected.
If we talk about passenger cars, then the main types are as follows:
- summer;
- winter (studded or Velcro);
- by destination - off-road (for SUV), sports, regional, highway;
- all-weather.
The depth of the tire pattern depends on the type and purpose of the wheels. We will talk about this in the article.
For an ordinary car new tire tread height is 7.5-8.5mm. Provided that you purchase tires for movement on asphalt roads for general use.
If the motorist owns an SUV or crossover and often goes off-road, the tread depth should be around 17 mm, due to the protruding cups and lugs.
Just in case, we recall that from January 1, 2015, new clauses were introduced into the rules for allowing vehicles to operate, according to which residual tread depth must not be less than 1.6 mm For passenger cars. This applies to both summer and winter tires. Although, it is advisable to install new tires when the tread has worn down to 2 mm. The court has a special badge - TWI, which determines the degree of wear.
You need to understand that there are no specific standards for the height of the tread of new rubber. If you visit a serious store, you should first of all pay attention to the manufacturer: Nokian, Michelin, Goodyear, Bridgestone and many others. These companies are famous high quality, therefore, by purchasing their products, you will be completely satisfied.
The tread height will be within 8 mm. Its reduction is allowed in cases where we are talking about tires for high-speed driving in sport mode. The depth then can be about 5-6 millimeters.
Winter tire tread height
For winter tires, tread depth is critical. If in summer you can safely drive on dry asphalt on almost “bald” tires, then in winter your safety depends on the quality of tires, especially when driving at high speeds.
Winter "shoes" for passenger cars can be divided into three types:
- studded;
- Scandinavian type;
- frictional.
The Scandinavian type and spikes are specially made for frosty and snowy winters. The tread depth of new winter tires is 9-10 millimeters. The Scandinavian type of tires is characterized by an asymmetric sparse pattern. Rectangular cups push through snow and ice, which are discharged through small slots - lamellae.
Studs, in principle, do the same job - break up snow and ice, providing traction.
For driving on asphalt, such rubber, of course, is suitable, but it will make a lot of noise. In addition, you risk losing all the spikes when braking hard on bare pavement.
The friction type of winter tires is ideal for driving in warm winters with little snow, in slush and mud. The tread depth here is usually about 9-11 mm. Thanks to thin slots and lugs, the adhesion surface with wet asphalt increases, and all moisture is removed through the lamellas. As a rule, friction rubber has a symmetrical tread pattern.
good service life winter tires usually 4 seasons. That is, the protector is erased much more slowly than in summer.
Tread depth by size
It is also worth noting that the tread height largely depends on the size. Yes, for summer tires depth will be:
- 165/70 R13 - 7-7.5 mm;
- 175/70 R13 - 7-9 mm.
If we talk about universal or winter tires, then the picture is as follows:
- 175/70 R13 - 9-11 mm;
- 187/70 R14 - up to 12 mm;
- 195-205 for 14 - 11-15 mm.
In Russia, in particular, there is a specially approved methodology, which provides the recommended parameters. Domestic manufacturers adhere to them so that the products comply with GOST.
Truck and off-road tires
Truck tires are not divided into summer and winter. They initially come with a powerful deep tread designed for a specific type of coating.
For example, the depth of our popular drawings - rhombuses, goose foot - also depends on the size:
- 240/260-508 (ZIL, GAZ-3307) - 16.3-18.3 mm;
- 280/300/320-508 (LAZ, MAZ, KAMAZ, ZIL) - up to 23 mm.
Well, for special rubber, for example, for mining dump trucks, the requirements are special and the depth can significantly exceed the indicated values.
For crossovers and SUVs with a size of 205-255 and a radius of 15-18 inches, off-road, the tread depth ranges from 12 to 17 millimeters. In principle, there is no special need to measure this parameter - height, when buying at a dealer store, since the quality and condition can be seen with the naked eye.
Good afternoon, dear reader.
This article will talk about updating the requirements for the tread pattern of car tires.
Changes in regulatory documents will only take effect on January 1, 2015, but I recommend that you study them in advance.
So, today the following documents will be considered: "List of malfunctions and conditions under which the operation of vehicles is prohibited" (document text) and "Technical regulations on the safety of wheeled vehicles" (text).
Let's get started.
Fault List Changes
Let's start with the changes made to the list of malfunctions in which the operation of vehicles is prohibited:
5.1. Tires cars have a residual tread depth of less than 1.6 mm, trucks- 1 mm, buses - 2 mm, motorcycles and mopeds - 0.8 mm.
Note. For trailers, the norms of the residual height of the tire tread pattern are established, similar to the norms for tires of vehicles - tractors.
5.1. The remaining depth of the tire tread pattern (in the absence of wear indicators) is no more than:
for vehicles of categories N2, N3, O3, O4 - 1 mm;
Note. The category designation of the vehicle in this paragraph is established in accordance with Annex No. 1 to the technical regulation of the Customs Union "On the safety of wheeled vehicles", adopted by the decision of the Commission of the Customs Union of December 9, 2011 No. 877.
First of all, they catch the eye, which are earlier in the rules traffic weren't mentioned.
The changes affected trucks with license maximum weight up to 3.5 tons, i.e. category B trucks. Previously, rubber could be used on such vehicles until 1 mm of tread remained. From January 1, 2015, the requirements will be slightly more stringent - 1.6 mm. For example, these requirements will affect small trucks (Gazelle, Mitsubishi L200, Volkswagen Amarok, etc.).
In addition, additional requirements are introduced for winter tires marked "M + S", "M & S", "M S". Such tires must have a residual tread depth of at least 4 mm. Moreover, this value does not depend on which category of vehicle the tires are installed on.
Technical regulation changes
Similar changes also affected Annex 7 to the technical regulation on the safety of wheeled vehicles:
5.2. The requirements of paragraphs 2.3.2 - 2.3.4 of Appendix No. 5 to this technical regulation apply.
5.2. The tire is considered unusable
5.2.1. When one wear indicator appears (a protrusion along the bottom of the treadmill groove, designed to visually determine the degree of wear, the depth of which corresponds to the minimum allowable tire tread depth).
5.2.2. With a residual depth of the tire tread pattern (in the absence of wear indicators) no more than:
- for vehicles of categories L - 0.8 mm;
- for vehicles of categories N2, N3, O3, O4 - 1 mm;
- for vehicles of categories M1, N1, O1, O2 - 1.6 mm;
- for vehicles of categories M2, M3 - 2 mm.
5.2.3. With a residual depth of the tread pattern of winter tires intended for operation on icy or snowy road surfaces, marked with a sign in the form of a mountain peak with three peaks and a snowflake inside it (see Figure 5.1), as well as marked with the signs "M+S", "M&S ", "M S", during operation on the specified coating - no more than 4 mm.
Figure 5.1. Winter tire marking
5.2.4. In the presence of local tire damage (punctures, through, blind and other cuts), which expose the cord, as well as delaminations in the carcass, breaker, bead (bloating), local delamination of the tread, sidewall and sealing layer.
For an objective comparison of the old and new version of the regulations, I will cite paragraphs 2.3.2 - 2.3.4 of Appendix 5, to which a link is given:
2.3.2. Tire tread height must be at least:
2.3.2.1. For vehicles of categories L - 0.8 mm;
2.3.2.2. For vehicles of category M1 - 1.6 mm;
2.3.2.3. For vehicles of categories N and O - 1.0 mm;
2.3.2.4. For vehicles of categories M2 and M3 - 2.0 mm;
2.3.2.5. For trailers (semi-trailers) - the same as for the tractors with which they work.
2.3.2.6. For winter tires, as well as tires marked with the sign "M + S" - 4.0 mm.
2.3.3. A tire is considered unusable when:
2.3.3.1. The presence of a section of the treadmill on which the height of the tread pattern along the entire length is less than that specified in paragraph 2.3.2. The size of the section is limited by a rectangle, the width of which is not more than half the width of the tread tread, and the length is equal to 1/6 of the circumference of the tire (corresponding to the length of the arc, the chord of which is equal to the radius of the tire), if the section is located in the middle of the tread tread. In case of uneven tire wear, several sections with different wear are taken into account, the total area of which has the same value;
2.3.3.2. The appearance of one wear indicator (a protrusion along the bottom of the groove of the treadmill, the height of which corresponds to the minimum allowable height of the tire tread pattern) with uniform wear or two indicators in each of the two sections with uneven wear of the treadmill;
2.3.3.3. Replacement of spools with plugs, plugs and other devices;
2.3.3.4. Local damage to tires (breakdowns, swelling, through and non-through cuts), which expose the cord, as well as local delamination of the tread.
2.3.4. Not allowed:
2.3.4.1. The absence of at least one bolt or nut for fastening discs and wheel rims;
2.3.4.2. The presence of cracks on the disks and wheel rims, traces of their elimination by welding;
2.3.4.3. Visible violations of the shape and size of the mounting holes in the wheel disks;
Just like in the list of malfunctions discussed at the beginning of the article, the technical regulations tighten the requirements for trucks of category B. Starting from January 1, 2015, they must have a residual tread depth of more than 1.6 mm.
In addition, the technical regulations provide for the marking of winter tires (a mountain peak with three peaks and a snowflake). If your tires have a similar emblem, then it is forbidden to operate them with a residual tread depth of less than 4 mm.
Well, one more thing. Previously, the requirements of paragraph 2.3.4 were imposed on the wheels of vehicles in operation. For example, the absence of wheel bolts, the presence of cracks in discs and rims, violation of the shape and size of the mounting holes, etc. No matter how strange it may sound, but from January 1, 2015, similar requirements for cars technical regulation will not present.
Good luck on the roads!
Dmitry-35
This is what happens? Clause 2.3.4.4. One axle vehicle tire different sizes, designs (radial, diagonal, chamber, tubeless), models with different tread patterns, frost-resistant and non-frost-resistant, new and restored, new and with a deep tread pattern. Does it also stop working?
This is deleted from the Technical Regulations, but remains in the annex to the traffic rules (clause 5.5 of the List of malfunctions)
The changes affected trucks with a maximum permitted weight of up to 3.5 tons, i.e. category B trucks. Previously, rubber could be used on such vehicles until 1 mm of tread remained. From January 1, 2013, the requirements will be slightly more stringent - 1.6 mm. For example, these requirements will affect small trucks (Gazelle, Mitsubishi L200, Volkswagen Amarok, etc.).
Error in the text: From January 1, 2013 .... Still, I think it means "From January 1, 2015"
GrammarNazi, Thank you! Changes have been made to the article.
If you notice something like this, be sure to write.
Good luck on the roads!
Vladimir-29
Summer tires can be used winter period if the road surface is not icy or snowy? In Crimea, in winter, the temperature is mostly above zero and without snow.
Can. Though in the Crimea, even in Vorkuta. The main thing is to complete the item:
5.5. Tires are installed on one axle of the vehicle various sizes, designs (radial, diagonal, chamber, tubeless), models with different tread patterns, frost-resistant and non-frost-resistant, new and restored, new and with deep tread pattern. On vehicle studded and non-studded tires installed.
Comments
How to understand (no more)?
5.2.3. With a residual depth of the tread pattern of winter tires intended for operation on icy or snowy road surfaces, marked with a sign in the form of a mountain peak with three peaks and a snowflake inside it (see Figure 5.1), as well as marked with the signs "M+S", "M&S ", "M S", during operation on the specified coating - no more than 4 mm .....
It turns out that with a tread depth of 3mm, operation is possible?
5.2. The tire is considered unusable:
In the table in decoding: "L - mopeds, motorcycles, ATVs, etc.", the error is not
ATVs, and ATVs!!! So?????
5.2. The tire is considered unusable:With a residual tread depth of winter tires ... - ... no more than 4 mm.
Is 3mm bigger than 4mm? No more, equals less!
"No more" is "less than or equal to", not just "less than". From the point of view of mathematics. Although in reality the boundaries and their belonging cannot be precisely established.
lego, thanks for the info. You are right, the article will be corrected.
Good luck on the roads!
Vyacheslav-5
Hello.
2.3.4.4. Installation on one axle of a vehicle of tires of different sizes, designs (radial, diagonal, chamber, tubeless), models with different tread patterns, frost-resistant and non-frost-resistant, new and retreaded, new and with deep tread pattern.
Vyacheslav, Hello.
There are no spares exceptions. If they stop, they will fine you. Therefore, if your spare tire is different from the rest of the wheels, then use it as little as possible (immediately head to the nearest tire shop).
Good luck on the roads!
Hello.
2.3.4.4. Installation on one axle of a vehicle of tires of different sizes, designs (radial, diagonal, chamber, tubeless), models with different tread patterns, frost-resistant and non-frost-resistant, new and retreaded, new and with deep tread pattern.
And about the spare wheel, is there an exception anywhere?
5.5. Tires of various sizes, designs (radial, diagonal, chamber, tubeless), models, with different tread patterns, frost-resistant and non-frost-resistant, new and retreaded, new and with a deep tread pattern are installed on one axle of the vehicle. The vehicle is equipped with studded and non-studded tires.
Within one day they will not be fined.
Many imported cars have a "dock", which is similar to a bicycle wheel. And the "stowaway" and any "reserve" can be used to follow to the place of repair. According to the annex to the SDA "LIST OF FAULTS AND CONDITIONS UNDER WHICH OPERATION OF VEHICLES IS PROHIBITED" the operation of the vehicle is prohibited. And even after stopping the IDPS on this issue, you have a day to fix this problem.
Dmitry-74
The Government of the Russian Federation decides:
1. Approve the attached changes that are made to the acts of the Government of the Russian Federation.
5.2.3. With a residual tread depth of winter tires intended for use on icy or snowy road surfaces, marked with a sign in the form of a mountain peak with three peaks and a snowflake inside it (see Figure 5.1), as well as marked with signs "M S", "M HE MORE THAN 4 mm
and in court I can appeal if they fine me that I have 3 mm, but the law clearly states no more than 4 ??
Dmitry, you took the phrase out of context. You can't do that in court.
This List establishes malfunctions of cars, buses, road trains, trailers, motorcycles, mopeds, tractors, other self-propelled machines and conditions, under which their use is prohibited..
Residual tread depth of winter tires intended for use on icy or snowy road surfaces, marked with a sign in the form of a mountain peak with three peaks and a snowflake inside it, as well as marked with signs "M + S", "M & S", "M S" ( in the absence of wear indicators), during operation on the specified coating is no more than 4 mm.
This point is difficult to understand, especially if you do not read the entire document.
In Ukraine, most motorists are used to assessing the condition of rubber by eye. Like, the tread is still normal - enough for the season
Of course, everyone has the right to decide for himself whether to ride on "bald" tires. But on the other hand, those who want to save money on buying new wheels risk not only their lives.
In Ukraine, the permissible height of the tread pattern is regulated by the document - Order No. 33 of 01.03.2010 "On the approval of the Perelika of technical standards, which are victorious in the subdivisions of the State Inspectorate of the Ministry of Internal Affairs for identifying and fixing violations of the rules of the road traffic."
According to this document, passenger car and truck tires with a maximum permitted weight of up to 3.5 tons must have a residual tread height of at least 1.6 mm. Although we note that in fact the traffic police do not have a certified measuring device that they could use to check residual depth tire tread.
About hydroplaning and slashplaning
If in human language, hydroplaning is the emergence of wheels and, as a result, a complete loss of traction. The more worn the tread, the higher the risk of hydroplaning. It also increases the stopping distance. Nokian tests testify to this.
AutoPortal has already said that during the visit, not a test site in Finland, we studied and monitored the movement. In addition, we were able to personally test tires of varying degrees of wear and feel the difference in the behavior of the car when driving on wet roads.
According to data obtained by Nokian during tests, on worn tires with a tread of 1.6 mm, the risk of hydroplaning on a road with a water level of about 5 mm occurs at a speed of 76 kilometers per hour. New tires - at 96 km / h.
There is also such a term as "slashplaning". It's almost the same as hydroplaning. But in this case, we are talking about the loss of grip not when driving on water, but when moving through sludge - a sour "porridge" that forms during a thaw. That is, it is sliding on slush.
If the tread is worn or the speed is too high, the tread stops pushing out water. This is explained simply - the area of \u200b\u200bthe contact patch of the tire and the road is greatly reduced. This picture shows the size of the contact area of a tire with different tread thicknesses at 3 mm water and a speed of 75 km/h. The contact patch of an old tire with a tread of 1.6 mm is only 16% compared to a stationary car.
How much does the braking distance increase with a residual tread depth of 4 millimeters, and what is the feeling of driving through a puddle when the tread depth is 8 millimeters - watch our video:
Conclusion
If you value your car and the health of your loved ones, change your tires on time. Yes, this pleasure is not cheap, but a collision with a car in front or a departure into a ditch is even more expensive. It is especially important not to "wear out" the wheels until they become "bald". Even 4 mm of residual tread depth affects the braking distance and the behavior of the car on slippery road. What can we say about the 1.6 mm residue ...
Winter car tires differ in material- softer, because of which the car does not slip, good adhesion of the wheels to the surface is ensured. Hydroplaning must not be allowed, they must ensure driving safety, high-quality braking. For the same purpose, they are made studded.
Another feature is a greater number of lamellas, that is, transverse slots in the bulges. They increase the stability of the car. Characteristic difference tires - deep tread.
Minimum new tire height- 8.5-9.5 mm. It will provide good car stability in the cold season if the road is open. In more difficult conditions, it is advisable to use a tread of 9.5-11 mm. For off-road, an indicator of 12 mm is better. There are also tires with a tread of 15 mm.
New winter tires must have a depth of at least 8.5 mm.
Drawing choose based on the conditions in which the car is operated more often. Options: directed(tracks with V-shaped icons, but the lines of the depressions do not converge at the top point, suitable for surfaces with areas of wet snow, dry and wet asphalt), symmetric(the grooves are also located in a wedge, but converge at one point at the tops, provide grip on wet roads, as well as on dry pavement), asymmetric(combine the advantages of the two previous types of pattern, used for heavy snowy roads, if you have to go to ice).
It is presented by different manufacturers in the following forms:
- Off-road. The pattern is often directed and V-shaped, and the depth of the depressions reaches 11-12 mm. It is better to use such rubber where there is a lot of snow, there is ice.
- high-speed. It usually has a directional pattern and a shallow tread, designed for driving on an open road, use in the city, not afraid of light snow, wet surfaces.
- Classical. It comes in directional and non-directional patterns. The tread is deep enough for use on snowy, but not completely impassable roads. It is better to apply in the city, at a moderate speed.
- Asymmetric. The outer half of the track of these tires is responsible for tight contact with a clean surface, the inner half helps to overcome snowdrifts and slush. But fast driving with such tires is undesirable.
When tires are abraded to the mark located in the recess, or the disappearance of the snowflake icon, they need to be changed. In the absence of an indicator the remaining tread of winter tires is no more than 4 mm.
Read more in our article about the types of winter tire treads, pattern options, wear and other features.
Read in this article
Winter tire tread features
Automobile tires designed for the cold season differ from summer tires in terms of material and many other indicators. Winter tires are softer, because they have to contact with snowy, icy roads or frozen asphalt. Thanks to this, they do not allow the car to slide, ensuring good grip of the wheels with the surface.
Hydroplaning, that is, partial contact with the road, must not be allowed. Winter tires should ensure driving safety, high-quality braking. For the same purpose, they are made studded, although this is not necessary.
Another feature of winter tires is a greater number of sipes, that is, transverse slots in the bulges. They increase the stability of the car. A characteristic difference between tires is a deep tread.
Height
Winter tires look thicker, more powerful. Actually, these qualities make the period of its use longer than that of the summer one. The tread height of winter tires can vary depending on the type and size of the tire. After all, the diameter of this part of the car is not the same for all vehicles.
The minimum value of the indicator, if we are talking about new tires, should be 8.5-9.5 mm. It will provide good car stability in the cold season if the road is open. In more difficult conditions, it is advisable to "shoe" it in tires with a tread of 9.5-11 mm. Such tires are more popular in Russia. For off-road, an indicator of 12 mm is better. There are also tires with a tread of 15 mm.
Depth
outer part automotive rubber has the form of rows of depressions and bulges. Therefore, there is the concept of “winter tire tread depth”. The term is used in regulations containing requirements for the state of the vehicle. But in fact, this is the height of the tread. After all, the size of the convex part of the tire is equal to the size of the recess adjacent to it. This is not about slots on the blocks, but the maximum high and low points of the surface. New winter tires must have a depth of at least 8.5 mm.
Drawing
Another feature that characterizes winter tires is the tread pattern. In the cold season, there can be ice, snow, wet “porridge”, and hardened open asphalt or soil on the road. The drawing is chosen based on the conditions in which the car is operated more often.
It is important that the rubber, when driving, fits as tightly as possible to the surface, removes fluid from under the wheels, and prevents slipping at speed and slow braking. It is impossible to combine all the qualities in one type of drawing, so there are several of them:
- Directed. These are tracks with V-shaped icons, but at the top point, the lines of the indentations do not converge. Such tires behave well on the surface with areas of wet snow, if it lies in a thin layer, dry and wet asphalt. But don't go too fast.
- Symmetric. The recesses are located in a wedge, as in the previous case. But at the tops they converge at one point. This tire pattern provides good grip on wet roads, as well as on dry pavement. They are designed for a carefully cleaned winter track, they provide an opportunity to develop speed.
- Asymmetric. Combine the advantages of the two previous types of drawing. Therefore, tires are used for heavy snowy roads, if you have to drive in ice. But don't move too fast.
Classic and European tire pattern Types of winter tires
Winter tire tread by different manufacturers is presented in the following forms:
- off road. The pattern is often directed and V-shaped, and the depth of the depressions reaches 11-12 mm. It is better to use such rubber where there is a lot of snow, there is ice. Indeed, on open asphalt, it makes a lot of noise due to excessive friction, which also increases fuel consumption. With off-road tires, you will not be able to quickly accelerate and brake.
- high-speed. This type of rubber usually has a directional pattern and a shallow tread. It is intended for driving on an open road, that is, rather for a temperate climate, use within the city. But it is also not afraid of light snow, wet surfaces. High-speed tires have a short braking distance, you can go fast. The noise level is low.
- Classical. It comes in directional and non-directional patterns. The tread of these tires is deep enough for use on snowy, but not completely impassable roads. It is best to "wear" them in the city, driving at a moderate speed.
- Asymmetric. The outer half of the track of these tires is responsible for tight contact with a clean surface, the inner half helps to overcome snowdrifts and slush. But fast driving with such tires is undesirable. A car “shod” in them under any conditions slows down rather slowly, it can skid.
Expert opinion
Nadezhda Smirnova
Automotive Law Expert
Most of the cars in the northern latitudes are used with classic tires, some with off-road tires. The recently appeared asymmetric ones are also in fashion. But they are not cheap, and their effectiveness in Russian conditions is doubtful.
Permissible tread in winter
Wear on thick winter tires is inevitable anyway. And it is important to change them to new ones in time to avoid loss of control over the car, an accident. The allowable tread of winter tires can be determined by:
- according to the wear indicator applied to the rubber;
- in accordance with traffic rules.
In the first case, everything is simple. If the tires are worn to the mark located in the recess, or the snowflake icon disappears, they need to be changed. But one should take into account road conditions in which technology is used. If you have to constantly drive on poorly cleared snow, ice, it is better not to wait until the rubber is completely worn out.
How to choose winter tires, see this video:
Minimal and residual wear of winter tires
In the absence of an indicator, the remaining tread of winter tires must not exceed a certain value. The term itself establishes a value, less than which the recess cannot be. The information is contained in paragraph 5.1 of the "List of malfunctions and conditions under which the operation of the vehicle is prohibited":
The remaining tread depth of winter tires intended for operation on icy or snowy road surfaces, marked with a sign in the form of a mountain peak with three peaks and a snowflake inside it, as well as marked with signs "M+S", "M&S", "M S" (if absence of wear indicators), during operation on the specified coating is no more than 4 mm.
And yet, the minimum tread of winter tires permitted by law is not yet a guarantee of safety. It is better to renew the rubber before it reaches the wear limit. For example, for off-road tires, a decrease in depth to 4 mm is unimaginable, it is difficult to drive a car with such changes. After all, this means that the tread is worn out by more than 50%.
How to detect wear
The critical level of rubber abrasion without an indicator is difficult to determine until it affects the ride characteristics. Tread wear winter tires more accurately measured with a caliper. It is placed in recesses at several points located far from each other. It is important to consider how much the thickness has decreased, in which places, if the numbers differ:
- a large degree of wear in the middle of the tires means that the wheel is overinflated;
- the same, but along the edges indicates a lack of air in them;
- irregularities on the wheel around the entire circumference give out an amateur to brake sharply and gas;
- fraying one of the edges of the tire means that the suspension needs to be checked.
Choose the right one winter tires, it is especially important to control her condition. Otherwise, the ride threatens to become extreme, including for other road users. You should not discount the fact that there is a fine for "bald" tires.
Useful video
For information on how to determine the wear of a winter tire, see this video:
