Tire sizes: explanation. Tyre size designations on the sidewall

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2019-06-24 05:00:34

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Many car owners when purchasing rubber faced with the problem of deciphering the tire sizes and markings in General. On the side of tire indicates the various data, the value of which knows not every motorist.

Key labeling

Tires are marked the different elements, the main of which is considered to be the following:

  • Model name and brand;
  • Manufacturer;
  • Regular size tires;
  • Speed;
  • The index of the maximum load;
  • Protection level;
  • The purpose of a rubber;
  • Operating conditions and seasonality;
  • Additional information.

tyres sizes decoding

Manufacturer

The name of the manufacturer usually indicated on the side of the bus in large letters, to make it visible. The main purpose of these writings - promotional purpose. Many manufacturers put on tires own original logo, thanks to which their products are recognizable throughout.

Make and model

Many manufacturers produce tires for cars under various brands that include several model lines. Factory tire sizes within the same model line can vary, which facilitates the selection of suitable tires.

Sizes tires

One of the most important characteristics of any tire is its size. If we consider the specific size of the tires on the car brand (for example, 195/60R14), in this case 195 mm - profile width. The ratio of height to width of the profile is expressed as a percentage and is indicated by the number 60. Letter R - radial type tires, which is one of the most popular and common today. Decoding the sizes of tires the last number (14) means the diameter in inches, i.e. the diameter of the disc. After the diameter is often indicated by the letter C, which means that tires of this type can be installed on small trucks, minibuses or vans. The load index for these tyres is specified in the form of two numbers, one of which indicates the load on the single tyre, the second on a double.

dimensions table

The Percentage ratio between the height and width of the profile is indicated not on all the tires: on the tire it usually is standard and varies from 0.8 to 0.82. If this parameter is below 0.8 then it is celebrated on the rubber in increments of 0.05.

Table of sizes of tires produced in the U.S. are somewhat different from domestic and European, and contain other designations, for example, 35/12.5 R15 113Q. The outer diameter of the tyre is indicated by the number 35, nominal width - number of 12.5. Remaining parameters are identical to those used by domestic car owners. In fact, the only difference in decoding tire sizes of American manufacturing is the use of the unit of measurement is inches, not millimeters.

Load Index, the maximum allowed on the bus

This parameter displays the maximum mass that can be absorbed by the tyre. The numbers that show the total, hide under a not the mass, but only the code. Approx value is calculated by dividing the vehicle weight by four. In the table of tire sizes and tires load index is usually indicated immediately after the size.

the size of the tires on the car brand

When choosing tires for a car you must take into account the index of the maximum speed and loads. It is advisable to purchase rubber where the settings some more, but within reason: the greater the load the tyre can withstand, so it is bulkier and heavier, which negatively affects fuel consumption and vehicle dynamics.

Speed Index

Marked with the letters of the English alphabet. Decoding tire sizes on this parameter are presented in special tables, and contains the rate at which you can move at maximum load on the tire. You specify the index after the load index.

Maximum pressure on the tire

One of the main parameters contained in the marking rubber. Specified either in kPa or PSI unit of measure of the pressure prevailing in the United States. Often the tires you specify the values in both systems.

sizes of tires and wheels transcript

Marking M+S

European manufacturers of automotive tyres often use this label to refer to rubber which can be used in mud and snow. This information can be found in the labeling of the sizes of winter tires. The specificity of this characteristic is due to the fact that winters in European countries, less severethan in Russia, therefore car owners often face with mud on the roads, not ice and snow.

Marking tires depending on the season and type of coverage

Manufacturers to indicate the seasonality of the tire refer to various markings. Most often there are the following options:

  • AS bus for use throughout the year;
  • AGT - all-season tires;
  • R+W - tires for use in cold season;
  • Frost - winter tires;
  • AW - can be used in all weather conditions;
  • A/T - rubber for use on all race tracks;
  • M/T tires for driving in rough and dirty tracks.

sizes of winter tyres

It is worth noting that some manufacturers label their tires no inscriptions, and figures, indicating the climatic conditions in which it can be operated. For example, winter tyres are marked with images of mountain peaks or snowflakes.

Purpose rubber

Before the size of tires listed letter indicating their purpose, that is, the class of vehicles for which they can be installed. The transcript sizes of tires and wheels for this parameter are:

  • P - for passenger vehicles;
  • LT - for vans and light trucks;
  • ST is for trailers;
  • LRO - for mounting on trailers with a low platform;
  • T - for temporary use, for example, as a spare wheel.

Production Year

Learn about the year and month of production of tyres from their markings. On the side of the tire manufacturer usually specifies four digits, the first two of which denote the ordinal number of the week, the remaining two - year of production.

Indices labeling

For American-made tires are usually listed as three main index:

  • Temperature. Displays the resistance of the rubber to high temperatures and its ability to maintain its properties under these conditions. Tires with high temperature resistance, marked with index A.
  • The Index of inhibition. The reliability of the adhesion of rubber with a slippery and wet surface. The best indicator similarly is the index of A.
  • Estimated mileage. The base value is 100, which corresponds to 48 thousand kilometers. The greater this parameter, the better the rubber and the higher its wear resistance.

Design Information

The Manufacturer on some models, and other all-season tires often indicates the number of layers of which is made of rubber. For example, such a marking may be indicated that the coating is made of polyester two-layer, two-layer single-layer steel cord and nylon cord.

regular tire size

Wear Indicator

Displays the level of wear of the tires and informs the owner about the need to replace them. Often located at the bottom of the tread grooves and is indicated by the special arrow.

Studding

Winter tires equipped with studs, the manufacturer often specifies the following:

  • AD - spikes of aluminum;
  • SD spikes, have a carbide core;
  • DD - the spikes are equipped with a rectangular core and having a diamond-cutting;
  • OD - oval core studs;
  • MD - spikes made of plastic and have a carbide core.

Color labels

Many manufacturers are marking their tires use color tags. Most often used triangles or circles of yellow, red or white. The toughest area in the sidewall of the tyre is marked with a red triangle or a point. If such a rubber is mounted on steel disc, the mark combines with the letter L on the disk. The most flexible place sidewall is marked with a white triangle or point. This mark when you install tires on alloy wheels should be opposite the mark L. With the valve disk combined plot, marked with a yellow triangle.

factory tire size

The tread rubber can also be color lines, which is a factory marked and easy for the warehouse staff sorting and storage of rubber with the same characteristics in one place. In addition, the presence of such bands allows the car owner to make sure that the purchased tires are really new and not previously exploited. To determine the size of the tires on the car brand can be the labeling given on their side: in it the encrypted data, such as disc diameter, section width, wear resistance, date of manufacture, maximum speed, load and many other information.


Article in other languages:

AR: https://tostpost.com/ar/cars/18009-tire-sizes-explanation-tyre-size-designations-on-the-sidewall.html

BE: https://tostpost.com/be/a-tamab-l/34557-pamery-shyn-rasshyfro-ka-mark-ro-ka-shyn-abaznachennya-na-bakav-ne-shy.html

DE: https://tostpost.com/de/autos/34246-reifengr-en-die-entschl-sselung-kennzeichnung-von-reifen-die-bezeichnu.html

ES: https://tostpost.com/es/coches/34115-las-dimensiones-de-los-neum-ticos-descifrar-el-etiquetado-de-los-neum-.html

HI: https://tostpost.com/hi/cars/19658-sidewall.html

JA: https://tostpost.com/ja/cars/17664-tire-sizes-explanation-tyre-size-designations-on-the-sidewall.html

KK: https://tostpost.com/kk/avtomobil-der/34866-m-lsher-shinalar-ma-ynasyn-ashu-shinalar-belg-leuler-bokovine-shinalar.html

PL: https://tostpost.com/pl/samochody/35919-wymiary-opon-zapiski-oznakowanie-opon-oznaczenia-na-boku-opony.html

PT: https://tostpost.com/pt/carros/35718-dimens-es-do-pneu-decodifica-o-marca-o-de-pneus-indicar-no-flanco-do-p.html

TR: https://tostpost.com/tr/arabalar/31292-lastik-boyutlar-zme-lastik-etiketi-belirtmek-yanak-lastik.html

UK: https://tostpost.com/uk/avtomob-l/35097-rozm-ri-shin-rozshifrovka-markuvannya-shin-poznachennya-na-bokovin-shi.html

ZH: https://tostpost.com/zh/cars/4370-tire-sizes-explanation-tyre-size-designations-on-the-sidewall.html






Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."

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