Not only the size: what else can you read from the inscriptions on the tires?

Are you looking for what tire markings mean and what their designations mean? In the article you will learn what the numbers and letters of car tire markings mean and a complete explanation of the remaining symbols on car tires for 2022.

R13 means the diameter of the rim, 155 is the width of the tire in millimeters, 70, in turn, means the profile, that is, the height of the rubber. This is a percentage of the tire width, i.e. 155 mm * 70% = 108.5 mm.

Tire markings - interpretation for passenger cars

At the moment, metric tire markings are used, which we will consider using the example of the P 205/65R16 91H tire marking, the decoding will be as follows:

  • P - optional index indicating the purpose of the bus
  • 205 – width of the tire profile (i.e. the contour of the tire in the radial plane of the wheel), indicated in millimeters
  • 65 - the ratio of the height of the tire profile to its width, indicated as a percentage
  • R - letter index indicating the type of tire
  • 16 - tire mounting diameter corresponding to the diameter of the rim of the car, indicated in inches
  • 91 - load index
  • H - speed index

Country of Origin

Usually the largest inscription on the sidewall is the manufacturer's company brand. It allows you to distinguish the tire from its competitors.

Many companies have their own tire production plants in different countries. You can determine the place of production by the inscription “Made in...”. Please note that it may not be present on all slopes. In this case, you will need to refer to the DOT code designation. The place of production will be encrypted in the form of two letters. The list below provides a breakdown of the main countries producing tires.

Full explanation of tire markings

Become familiar with all the markings on car tires used by tire manufacturers. Find out how to find out the size and date of manufacture of tires, what are the load and speed ratings, and what is a tire with the M+S designation? See where you can find information about protective rims. We have dispelled all doubts related to the markings on the tire.

Correct reading of the markings ensures the best choice of tires and their subsequent trouble-free operation. In this article, we will clearly explain the meaning of the mysterious symbols you may find on tires.

Color markings

In addition, each manufacturer, for its own convenience or specific needs, can apply different marks of its own for each tire.

  • Yellow marks are placed on the lightest part of the tire as a place to install the nipple, simplifying the work of the tire fitter.
  • The red mark on the tire indicates the place of greatest heterogeneity or the heaviest part.
  • Colored stripes on the tread in a variety of colors are designed to simplify logistics and help distribute tires to warehouses.
  • A white circle with a number on the side is a sign corresponding to the Soviet Quality Control Department (technical control department), which means inspection at the warehouse by the supplier.

The most common markings on tires are:

  • Tire size
  • Speed ​​index
  • Load Index
  • 3PMSF
  • M+S
  • Protective Edge
  • Tire reinforced
  • Date and place of production
  • Asymmetrical tire
  • Directional bus

All tire markings (in alphabetical order): # B C D E FG N IJKLMNOPRSTUVWXYZ

Additional information related to tire markings:

  • Tire labels
  • How to distinguish winter tires from summer and all-season tires?
  • UTQG marking (TEMPERATURE, EQUIPMENT, TRACTION)

Tire sizes.

So, let's begin. We take the tire and carefully look at the sidewall, starting from the outer radius. The first thing you should pay attention to is the tire dimensions, they are printed in very large letters and numbers. You will see the inscription - 205/60 R16 92 H or other numbers in the same sequence. Americans have P 205/60 R16, and if P-Metric is used, then, for example, it could be like this - 31x10.5 R15 or 35x12.50 R 15 LT 113R. A mixed system may look like this - 6.15-13/155-13.

The first number 205 is the width of the tread (tire) in millimeters (or in inches from our example 10.5 or 12.50). This parameter affects the dynamics of the car and the safety of its operation.

The second number 60 is the ratio of the profile height to the tire width as a percentage. Here you should clearly understand that if, for example, the tires are wider, but this parameter is the same, then the profile height will not be the same, it will be larger. Let’s say, if we take our tire 205/60 R16 and, for example, 215/60 R16, then at first glance you might think that they are the same, including the profiles, because both have this value equal to 60, only the tread of the second is 10 wider mm. But we must not forget that 60 is a relative value - it is a ratio, the result of calculations. Let's do the back calculations and find out the real value in mm for these two tires - 205/60 R16 and 215/60 R16:

  1. 60:100x205=123mm;
  2. 60:100x215=129mm.

From our calculations it is clear that with equal values ​​of this percentage (60), the profile height of the second tire is greater than the first. This must be taken into account, because, in most cases, an increase (change) in this indicator relative to that recommended for your car is undesirable and even unacceptable.

Often the percentage ratio of the height of the tire profile to its width is simply called “profile”. In no case should we forget that this is a relative value, i.e. it is not always possible to judge the real height of the profile by this parameter.

Although, of course, this warning applies to cases when you order tires, and if you buy them yourself, then, basically, the difference in the profile height of two different tires can be noticed without calculations.

The letter R indicates the type of tire. In our case, it is radial; if there is no letter or there is a D, then we have a diagonal tire, but they are much less common on passenger cars, we talked about this in this article.

After the letter R there is a number, in our case 16 (and 15 in mixed markings after the hyphen 13). This is the bore diameter, or the diameter of the wheel rim in inches. Here, we hope, everything is clear. This diameter must match the diameter of the wheel rim of your car - there is no other way. The Americans stood out; the first number, in our case 31 or 35, is the outer diameter of the tire in inches.

The next number 92 (113) is the load index. A very important parameter that shows how much weight a tire can withstand depends on its design and what materials were used in the manufacture of the sidewall and frame. To determine the load index, take the total weight of your car, increase it by 30% and divide by 4. And then look at the table and select, based on the resulting mass in your calculations (in kg), the appropriate load index in the first column of the table:

Tire load rating index.

Load IndexLoad in poundsLoad in kgLoad IndexLoad in poundsLoad in kgLoad IndexLoad in poundsLoad in kg
656392908411025001031929875
666613008511355151041984900
676773078611685301052039925
686943158712015451062094950
697173258812355601072149975
7073933589127958010822051000
7176134590132360010922711030
7278335591135661511023371060
7380536592138963011124031090
7482737593143365011224691120
7585338794147767011325351150
7688240095152169011426011180
7790841296156571011526791215
7893742597160973011627561250
7996343798165375011728331285
8099245099170977511829101320
811019462100176480011929981360
821047475101181982512030861400
831074487102187485012131971450

And the last letter, in our case H, is the speed index. Indicates the speed limit at which the vehicle can be driven as safely and comfortably as possible, and the tire can maintain its round shape and effectively resist bursting. Here everything directly depends on what and how the breakers are made.

Permissible speed indices.

Speed ​​indexJKLMNPQRSTUHVVRWYZR
Add. Speed ​​– km/h 100110120130140150160170180190200210240>210270300>240

Let's continue further... You may ask, what do the letters P and LT stand for in American markings? Here they stood out again. This is the type of vehicle for which these tires are designed. As follows:

  • Passanger – tires installed on passenger cars, marked P;
  • Light Truck - tires designed for light trucks, vans and minibuses, marked LT;
  • Special Trailer – these are tires for trailers, trailers, ST marking;
  • Temporary – “temporary tanks”, “dokatki”, used as a spare tire, marked T;
  • Light Truck Personal - not entirely clear, but it translates as light trucks for personal use, LTP marking.

There, on the outer radius of the tire, next to the size indication, you can see the name of the manufacturer in English and the name of the tire model. For example, Bridgestone Potenza or Nokian Hakkapeliitta R.

If the information indicated above is present in one form or another in the marking of any tire, then it becomes more complicated. Different manufacturers post the same information in different places, but that's not the worst thing. Each manufacturer, in addition to inscriptions, comes up with its own pictograms with drawings, which are quite difficult to understand.

Therefore, an important piece of advice is that before purchasing the selected tire, to understand the markings, go to the manufacturer’s website, this is the only way to understand what the pictogram of a Chinese border guard with a dog means, marked as a mark on the tire.

But seriously, we’ll focus on the basic designations, but if you haven’t found below in our article, then welcome to the manufacturer’s website.

Explanation of tire marking designation

  1. Tire width in millimeters
  2. Profile height as a percentage of width
  3. Letter designating the tire design (R - radial, D - diagonal, B - belt
  4. Rim diameter in inches
  5. Load index (coefficient) that determines the maximum load on the tire at which it will not collapse
  6. Speed ​​index, which determines the maximum speed for which the tire is designed
  7. The presence of the word REINFORCED or the letter C indicates a reinforced tire carcass
  8. Manufacturer country
  9. Indication of the side for asymmetrical tires, OUTSIDE is the outer side of the tire, INSIDE is its inner side
  10. Adaptability of the tire to special operating conditions, M&S (M+S) - mud and snow, AS (All Season) - all-weather, AW (Any Weather) - any weather, Aquatred, Aquacontact or an umbrella pictogram - special rain tires, Pictogram in in the form of a snowflake - tires for winter, lack of any markings - tires for use only in the warm season
  11. Certification mark
  12. TUBELESS - tubeless tire, TUBE TYPE or no inscription - tire with a tube
  13. Tire design details
  14. Manufacturer's company name or logo
  15. Tire model
  16. Maximum load and pressure

Installation procedure.

There are unique asymmetric tires and a number of others that require certain installation conditions, then the marking indicates how and where exactly the tire should be installed. Main options:

  • the outer part of the asymmetric tire - the inscription Outside or Side Facing Out;
  • the inner part of the asymmetric tire – Inside or Side Facing Inwards;
  • direction of rotation of the directional tire – arrow and the inscription Rotation;
  • the tire is installed only on the left side - the inscription Left;
  • The tire is installed exclusively on the right side - the inscription Right.

What do the symbols on the bus mean?

195 — tire width in millimeters.

50 - the value expressed as a percentage means the ratio of the height of the side of the tire (the place where we found information about the tire size) to the width. In this case, the value "50" means 50 percent of 195 mm or 97.5 mm.

R - radial design, a type of tire construction.

15 - the diameter of the seat, which is also the diameter of the rim, given in inches. 82 T is a load index with a value of 82 and a T class speed index (you can read the indices below).

C - designation of the delivery tire.

Speed ​​index. The speed index is a sign that tells you the maximum speed you can drive on a given tire. You will find it on the side of the tire, at the end of the size sign. ATTENTION! For winter tires, you can use a lower speed than the manufacturer's recommended speed.

Manufacturer and production date.


So, it is mandatory to put “Made in” on the tire (produced in...), indicating the country in which the tire was made. For example, Made in Finland (made in Finland) or Made in France (made in France).

To find the production date, look for four numbers (may be in an oval). The first two digits are the week of production, the last two indicate the year. For example, 3813 (thirty-eighth week, that is, the second half of September 2013).

Load Index

The load index is another important mark on the tire. Indicates the maximum permissible load on one tire when driving at maximum speed. It is strictly forbidden to use tires with a lower load rating than recommended for a specific vehicle model. For example, a tire with a load index of 91 can be subjected to a maximum load of 615 kg. If you multiply this value by the number of tires on the car, you will get a result that is slightly higher than your vehicle's maximum fully loaded gross weight (you can read this in the F1 field on your registration certificate).

The most common load indicators:

Tire homologation.

In order to improve the performance characteristics of tires, manufacturers homologate them. In simple terms, they produce tires for cars of a certain manufacturer. Here is the homologation marking for the main manufacturers:

  • Mercedes-Benz - MO and variations for certain models, for example, MO1 for the SL65 AMG;
  • Porsche - N and a number, for example, N0, N1, N2, N, in some cases are also suitable for Volkswagen Touareg;
  • Audi – general marking AO, for the Quattro model range – RO;
  • BMW – homologation is hidden under the * icon, for the M-series * BMW;
  • Ferrari - tires for horses from the Italian stable are designated K1;
  • Jaguar - tires for English kittens are marked with the letter J.

The list goes on, if you find such a marking, then contact the manufacturer’s website.

All tire markings (in alphabetical order)

3PMSF is a symbol confirming winter tire properties found on winter tires and all-season tires.

3PMSF symbol on the bus. B Designation

BasePen - The tire is electrostatically grounded (a groove running through the center of the tread contains a silica mixture that dissipates electrical charges).

BLT - (Raised Black Letters) black and raised letters. Designation BSW - (black sidewall) inscriptions on the tire in black.

C - COLD marking - this is information that the pressure is measured on cold tires. You will find the tire's production date at the end of the DOT number.

D - DOT - (Department of Transportation) tire property designation meets all safety standards of the US Department of Transportation. The mark is adjacent to the 12-digit identification code or serial number of the tire. At the end of the DOT number is the date of manufacture of the tire. Tire release date—indicated at the end of the DOT number. The picture shows the Matador tire released in week 42 of 2008. Tire age information is also on the side. Look for a tire identification number that begins with the letters DOT. This is a string of 7 to 12 characters long, informing about the entire batch of tires produced at this plant. The last four digits of this code (most often located on the border) contain information about the tire production date. For example, 4208 - the first two digits are the week of production, the second two are the abbreviation of the year, that is, the tire was released in the 42nd week of 2008. Designation DSST - Dunlop RunFlat tire.

E - Designation ECE, e, E - abbreviation for Economic Commission for Europe means European approval. EMT (Extended Mobility Tire) tires allow you to drive even after the pressure drops to zero.

F - Designation FP - (Fringe Protector) or RFP (Rimb Fringe Protector) tire with rim protection. Dunlop uses the symbol MFS. The FR marking is a tire with a protrusion to protect the rim from mechanical damage. Most often found in tires with a profile of 55 and below. This depends on the specific manufacturer, as well as the type and size of the tires. Examples of sizes where ribbed tires are the most common are: 205/45R16, 195/50R15, 205/55R16 (there are exceptions). Less common for sizes: 145/65R15, 235/70R16 (in SUVs). FR markings do not appear on tire sidewalls.

and - Signs outside and inside - symbols used in asymmetrical tires, indicate which side of the tire should be installed inside, in the direction: towards the car, towards the hub with the rim. The inside side of this tire should not be visible from the outside of the vehicle.

J - Designation JLB - (Jointless Band) endless tape made of nylon.

L - Marking LI - (load index) indicator that determines the maximum load capacity of the tire.

LT - (Light Truck) marking indicating that the tire is intended for 4x4 vehicles and light trucks (used in the USA). This happens down to the tire size.

M - Marking MAX - maximum or maximum tire pressure.

The M+S (Mud and Snow) designation is mud and snow used as a designation for winter, all-season and SUV/SUV tires; often found even on tires from Europe; This designation is only a declaration of the manufacturer, it is not an official symbol confirming the winter properties of the tire.

The M+S marking is found not only on winter and all-season tires.

Marking MFS - (Maximum Flange Shield) - rim protection; Some winter tires have a protective edge on the rim, called a wheel tread. The purpose of the rim is to protect the edge of the rim from mechanical damage that may occur, for example, when approaching a curb or getting caught in an object. There are different names for rantings, depending on the tire manufacturer.

The most common non-MFS are: RFP (Rim Fringe Protector) marking, FP (Fringe Protector) marking - rim protection, FR (Felgen Ripen) marking - rim protector.

o - Designation OWL - (Circled in white letters) in white letters. EXTERNAL SYMBOL - used on asymmetrical tires, denotes the method of tire assembly. Outside means that the side of the tire with this mark must be visible from the outside of the vehicle after the wheel is installed on the rim.

P - Designation P - (Passanger) symbol is placed in front of the tire size. This means that the tire is designed for passenger cars (used in the USA). The PAX marking is a zero-pressure Michelin tire with a stable inner ring. Designation PSP-Beta - the tire has a design that is characterized by overlaps to reduce noise levels.

R - Marking R - (radial) radial tire.

RBL markings are (recessed black letters) concave black letters.

RETREAD marking - retreaded tire.

The RF designation is an abbreviation for reinforced English; describes a reinforced tire with increased load-bearing capacity (load-bearing capacity). It has the same meaning as for tires with the XL symbol. Other designations for reinforced tires are, for example, EXL, RFD, REF, REINF. RFT - Run Flat Tires, Run Flat tire, used in Bridgestone, Firestone, Pirelli. RIM PROTECTOR marking - the tire has solutions to protect the rim from damage. The rim protector prevents damage to the rim due to impacts or abrasions, such as on a curb.

ROF is a "Run On Flat" symbol used by Goodyear and Dunlop to mark tires that allow tires to continue driving after tire failure without air pressure inside. ROTATION marking - always with an arrow, indicates the rolling direction of the tire used in directional tires. The ROTATION indicator informs you about the correct way to install the directional bus.

RSC Marking - Abbreviation for Run Flat System Component. This occurs on tires compatible with the run flat system used in BMW vehicles. Designation RWL - (Raised White Lettering) raised white letters.

S - Designation SST - (Self Supporting Technology = RunOnFlat) a tire that allows you to continue driving even after a breakdown, when the pressure inside is zero. SI - (Speed ​​Index) designation indicating the upper limit of the permissible speed of use. T Designation TL - (tubeless tire) tubeless tire. Designation TT - (tube tire type) dętkowa tires. The TWI designation is an abbreviation for the English Treadwear Indicator. The TWI marking is found in six places around the tire circumference (in the form of ridges in the tread grooves) and indicates the permissible wear limit of the tread pattern. When the tread wears to the TWI level, it means the tire has reached the legal depth of 1.6mm. Then you should consider replacing the tire.

U - Designation ULW - the tire has a construction that uses aramid cords.

B - Designation VR or ZR - speed indicators are woven into the tire size. The VR and ZR markings indicate that the tire can be used with full load capacity up to the specified speeds: VR - up to 210 km/h, ZR - up to 240 km/h. For example: 225/45 ZR17 91 W means that the tire can be used with full load up to 240 km/h, and the maximum speed for this tire is 270 km/h.

X - Mark XL - (Extra Load = RF) tire with reinforced structure and increased load capacity. Reinforced tires have a special design that allows them to be used with greater loads.

c - Designation ZP - Zero Pressure, Michelin tire for descent.

Additional information related to tire markings

Tire label From November 1, 2012, on every tire manufactured after June 30, 2012, a label must be found informing about the main characteristics of the tire. It has 3 parameters: rolling resistance, which affects fuel combustion and CO2 emissions, wet grip, which gives an idea of ​​the overall level of safety provided by the tire, external noise level, which affects the overall road noise level.

The labels give a general idea of ​​the tire's characteristics, but do not contain many important parameters, such as the basic characteristics of winter tires. Don't completely trust the label when making a tire purchasing decision.

Example analysis


Next, we will look at an example and decipher it.
The name of the company and tire model (GoodYear UltraGrip) are written on the outside. Next are the numbers 205*55*R17. This is how the European marking is applied. The first number indicates the width of the profile, the second indicates the height relative to the width, and the third indicates the mounting diameter. The letter R indicates that we are talking about radial tires. The American version of the designation may not differ from the European one - only letters corresponding to the car class will be added (P - passenger, LT - Lignht Track, T - Track). Or there may be another format, where all values ​​are indicated in inches. For example, the indicator 30*11*R17 means that we have a tire with an outer radius of 30 inches, a tread width of 11 and an inner radius of 17 inches.

On the outside there is the number 89H. These are load and speed indicators. According to the terms of its marking, the wheel can carry a load of up to 580 kg and a maximum speed of 200 km/h. There is also the inscription Reinforced here. This means that the kit is reinforced and has an increased number of breaker layers. This increases its carrying capacity by three units.

The arrow with the inscription Rotation and Outside indicates the direction of rotation, and also informs about the outer side of the sidewall (only for tires with an asymmetric pattern). The Tubeless indication indicates that there is no tube inside the wheel, and the RF (RunFlat) marking indicates reinforced rigid cords, which allow you to reach a car service center at a distance of 80 km after a puncture and loss of pressure. Even after such use, the tire will remain operational. The inner circle gives information about when the tire was manufactured. Four digits 2012 indicate that the product left the assembly line in the 20th week of 2012. There is also information about the maximum pressure in kilopascals and an inscription about the country of origin.

How to distinguish a winter tire from a summer tire?

Winter tires have M+S (Mud+Snow, Mud+Snow) on the side of the tire and a three peaks symbol with a snowflake inside. Sometimes there is no M + S sign on the tire, but there is a symbol with a snowflake - this also means. that the tire is intended for the winter season.

It is a little more difficult to distinguish a winter tire from a year-round tire. Tires of this type, found in Europe, are usually identified by a snowflake with an M+S symbol. The differences are visible in the tread. In the case of an all-season tire, it has fewer cuts and grooves than a typical winter tire, but more than a summer tire. Some models have an asymmetrical tread pattern: half is responsible for summer performance (summer tread with fewer bars), and the other for winter performance.

All-season tire model names often include phrases that indicate good performance throughout the year, such as "All Season", "Quatrac", "Quadraxer", "4 Seasons", "All Weather", etc. Some manufacturers also have your own year-round tires - these are usually symbols that allow you to easily identify the type of tire you're dealing with.

Watch out for tires that have the M+S designation without the snowflake. These may be products imported from the US, where most tires carry the M+S designation, but have nothing to do with all-season or winter products.

In European realities, all-season tires are similar to winter tires, so they most often have the symbol of a mountain with a snowflake. The M+S marking may also appear on 4x4/SUV tires regardless of their season. In conclusion, the mountain symbol with a snowflake means that the tire will perform well in typical winter conditions. UTQG marking The UTQG marking (Uniform Tire Quality Grading) applies mainly to passenger tires from the US market, but they can also be found in Europe (this model may fall into both markets). They are not officially used on our continent, so manufacturers and sellers do not report their meaning and cost for these models. This type of marking can be found on the sidewall of the tire in the form of subtitles with specific meanings: TREADWEAR - abrasion resistance of the tread, TRACTION - tire grip on wet roads, TEMPERATURE - tire resistance to overheating. tread wear.

To explain this concept well, the definition of a comparison bus should be mentioned first. This is a standardized model whose parameters correspond to the TREADWEAR 100 index. TREADWEAR values ​​can appear on tires for sale in multiples of 20 (60 - 80 - 100 - 120 - ... 200 ... 800).

How are they distributed? The test is conducted under controlled conditions on a designated route of 6,400 miles or approximately 10,300 kilometers around Goodfellow Air Force Base, San Angelo, Texas.

The tested tires are installed on a specially prepared car together with tires with an index of 100, and then the consumption is compared. Its level is measured every 800 miles (1,287 km). Based on the measurement results, tires are given an index, such as 60, 100, 200 or 400. If a tire receives an index of 60, its theoretical durability is 60% of the comparison tire (index 100).

As a result, a tire with an index of 60 will wear out almost 2 times faster than a tire with an index of 100. In turn, a tire that receives an index of 200 will wear out 2 times slower than a comparison tire, and 2 times faster than a tire with an index of 200. index 400. A model with an index of 400 will be 4 times more durable than a comparative product (with an index of 100).

TRACTION Adhesion under UTQG marking is expressed by letters. The highest rating is AA, followed by A and B, and the lowest is C. This rating gives the driver information about the tire's ability to stop the car on wet roads.

The TRACTION parameter is determined on an asphalt or concrete path under strictly defined conditions. The test car accelerates to a speed of 65 km/h, then brakes. During the test, the vehicle's ABS system is disabled. In Europe, the lowest allowed TRACTION value is A. If someone prefers a dynamic and aggressive driving style, it is worth looking for tires with the AA index. Indices B and C are acceptable only in American conditions, and in Europe it is better not to buy such tires.

It should also be noted that the TRACTION marking does not indicate dry adhesion, flexure or hydroplaning resistance.

TEMPERATURE

The last of the UTQG designations is TEMPERATURE, which determines the tire's resistance to overheating, that is, the temperature created while driving. When driving at high speeds, the tire becomes very hot, which can shorten its life. Laboratory tests are carried out to isolate the index (possibly A, B and C, where A is the best value). Resistance to overheating is very strongly related to the speed index. Therefore, for the A mark, a 30-minute test at 115 mph (185 km/h) must be completed to obtain the B mark, at a 30-minute test speed of 100 mph (160 km/h) for both the tire and index C The tire must pass the test at 85 mph.

TRACTION (adhesion) and TEMPERATURE (overheating) markings in Europe must be at least A. TREADWEAR (wear resistance) will help you choose tires with a longer service life. If you want to take these signs into account, remember that the difference between tires with an index of 200 and 400 will be significant. However, UTQG markings should be considered as an overview only. There is no need to use them in Europe and the values ​​are determined based on North American conditions.

Tire markings must be applied to the following tire manufacturers:

Amtel, Belshina, Barum, Bridgestone, Continental, Cooper, Cordiant, Dayton, Debica, Goodyear, Dunlop, Falken, Firestone, Fulda, General, Gislaved, Hankook, Kama, Kelly, Kleber, Kormoran, Kumho, Marshal, Matador, Maxxis, Michelin, Nitto, Nokian, Pirelli, Sava, Semperit, Tigar, Triangle, Toyo, Uniroyal, Yokohama. This tire marking is valid from 2022.

Wear indicators

The locations of critical tread wear marks on Continental tires are indicated by the letters TWI. On summer models they are supplemented with indicators with cross and drop marks. They signal that the tires have not yet reached the minimum tread height, but it is no longer enough to feel confident in the rain.

There are also VAI indicators on the tread. They are applied symmetrically in the left and right shoulder areas. If the wheels are installed correctly, they change exactly the same as the tires wear out. Discrepancies are a reason to visit the wheel alignment stand. So far, the technology is used only on truck tires.

Symbols for correct rubber installation

In addition to deciphering the inscriptions on tires, the second most important are special symbols that allow you to correctly mount the tire.

Rotation

This symbol can be present in the form of an inscription or an arrow. It shows the direction of rotation of the tire. If you put the arrow in the other direction, the rubber will experience increased wear and will quickly fail.

Outside

An important indicator for tubeless tires. Translated from English, the word means “external”. This means the side of the rubber that should be on the outside. Otherwise, such a tire will not hold pressure.

Seasons and their changes

Tire markings vary depending on the season and surface.

Symbols for seasonal characteristics:

  • AS, AW, AGT – the tire and tire are suitable for use in any season;
  • R+W, Frost – tires for the cold season;
  • A/T – tires suitable for any type of terrain;
  • M/T – the tire is suitable for driving on muddy terrain;
  • Rain, Water, Aqua - rain tires.

Manufacturers often replace letter symbols with corresponding pictures to reflect the use of tires in certain weather conditions.

Tires for any season have 3 symbols: sun, snowflake and drop.

An image of mountains or a “snowflake” symbol will tell the driver that the tires are suitable for winter and icy conditions. If the corresponding pictogram is missing, the tires are only suitable for summer weather.

The “umbrella” symbol indicates that the tire is used when there is a lot of water on the road.

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