Decoding tire markings: what do the numbers and letters on the sidewall of the tire mean?

Have you ever taken a close look at the sidewall of a car tire? At first glance, it looks like a chaos of numbers, letters and pictograms. But in fact, each tag carries critical information: from dimensions and load capacity to seasonality and production date. A mistake in choosing tires according to the markings can cost you not only a fine at a technical inspection, but also your safety on the road.

In this article we will look at all tire markings - from standard parameters like 205/55 R16 to little-known characters like M+S or 3PMSF. You will learn to distinguish winter tires from all-season tires by markings, understand what the speed index means H or V, and why a tire's production date is more important than you think. And at the end of the article - FAQ with answers to the most frequently asked questions and an interactive survey about your tire selection experience.

1. Basic tire parameters: size, design and diameter

The most noticeable part of the marking is a combination of numbers and letters like 195/65 R15. It describes the geometric parameters of the tire, which determine its compatibility with your car. Let's look at it in order:

• 📏 195 — tire profile width in millimeters. The higher this number, the wider the tire and the better the grip, but the higher the fuel consumption.
• 📉 65 — profile height as a percentage of the width. In this example, the sidewall height is 65% of 195 mm. Low profile tires (such as 40 or 45) improve handling, but have poorer shock absorption.
• ⭕ R - radial cord design (the most common type). Less common D (diagonal) or B (belted).
• 🔄 15 — rim diameter in inches. Must strictly match the diameter of your disks.

Example: if your car has tires 205/55 R16, then the tires 195/65 R16 physically will not fit - even if the rim diameter is the same, different widths and heights of the profile will distort the speedometer readings and worsen handling.

2. Load and speed indices: what do the numbers and letters mean?

After the tire size there are two key parameters - load index (digit) and speed index (letter). For example, 91T or 102H. These values ​​determine what maximum loads and speeds the tire can withstand.

Load Index is a conditional code that indicates the maximum weight per wheel. For example, index 91 means the tire can withstand 615 kg on the wheel. For a passenger car, indexes from 80 (450 kg) up to 100 (800 kg).

Speed index is indicated by a letter and shows the maximum speed at which the tire retains its properties. Common meanings:

Letter	Maximum speed (km/h)	Typical Application
T	190	City and family cars
H	210	Sports sedans, crossovers
V	240	Premium and sports cars
W	270	Supercars and high-speed cars
Y	300	Extreme Sports Cars

⚠️ Attention: If you install tires with a speed index lower than that recommended by the vehicle manufacturer, this may result in denial of insurance payment in case of an accident, since the tire is not designed for the declared characteristics of the car.

3. Date of manufacture: how to determine the age of a tire

The tire's manufacturing date can be found in an oval stamp on the sidewall - usually 4 digits in the format week/year. For example, 2523 means the tire was released in week 25 of 2023 (June 2023).

Why is this important? Rubber ages even if the tire is not used. Manufacturers recommend changing tires after 5–6 years from the date of production, regardless of mileage. After 10 years, rubber becomes dangerously brittle - the risk of rupture at high speed increases significantly.

Where to look for the date?

• 🔍 On the outer or inner side (sometimes covered by the rim of the disc).
• 📅 There may be an inscription nearby DOT (Department of Transportation) - a US standard by which all tires are labeled.
• ⚠️ On some tires the date consists of 3 digits (for example, 125) is an obsolete format for tires manufactured before 2000. These tires cannot be used.

What to do if the production date has been erased?

If the numbers are not readable, the tire is automatically considered potentially dangerous. According to the Russian Federation Traffic Regulations (Appendix 1 to the Traffic Regulations, clause 5.5), operating a vehicle with tires that “do not have wear indicators or other markings” is prohibited.

4. Seasonality of tires: how to distinguish winter from summer tires by markings

The seasonality of a tire is determined not only by the tread pattern, but also by special designations. Here are the main markings:

• ❄️ 3PMSF (Three Peak Mountain Snow Flake) - a symbol of a mountain with three peaks and a snowflake. Indicates that the tire has been tested on snow and meets winter standards. Mandatory for winter tires in Russia from 2021.
• 🌨️ M+S (Mud and Snow) - mud and snow. This marking does not guarantee winter properties! Tires with M+S, but without 3PMSF, are considered all-season and in some regions of Russia not allowed in winter.
• ☀️ Absence 3PMSF and M+S - summer tires. Using such a tire in winter may result in a fine. 2000 rubles (Part 1 of Article 12.5 of the Code of Administrative Offenses of the Russian Federation).
• 🍂 All Season or AS — all-season tires. They are allowed for use all year round, but are inferior in performance to specialized winter and summer tires.

⚠️ Attention: From June 1, 2026, new rules for the use of tires have been introduced in Russia:

It is prohibited to use studded tires in summer (June to August) and summer tires in winter (December to February). For violation - a fine of 2000 rubles. All-season tires (M+S without 3PMSF) are allowed, but in a number of regions (for example, Moscow, St. Petersburg) it is required in winter mandatory 3PMSF marking.

5. Additional designations: from cord type to country of origin

In addition to the basic parameters, you can find a lot of other useful information on the bus. Here are the most important notations:

• 🔧 Tubeless — tubeless tire (most modern tires). If this inscription is not present, the tire requires a tube.
• 🛡️ Reinforced or XL — reinforced tire with increased load capacity. Often used for minibuses and crossovers.
• 🇷🇺 E4 (or another number with a letter) is a sign of compliance with European standards. For example, E4 023456 means that the tire is certified in the Netherlands (code E4).
• 🔊 DB (decibel) - tire noise level. The lower the number, the quieter the tire. For example, 72 dB - This is a very quiet tire.
• 🌡️ Temperature A/B/C - resistance to heat (marking according to standard UTQG). A - the best indicator.

The bus may also indicate:

• 🏭 Made in... - country of origin (for example, Made in Russia or Made in Germany).
• 🔄 Rotation and arrow - direction of rotation (important for asymmetrical and directional tires).
• 🔢 TWI (Tread Wear Indicator) - tread wear indicators. When the tread wears down to these marks, the tire needs to be changed urgently.

Make sure that the size matches the one recommended for your car|Check the production date (not older than 3–5 years)|Presence of 3PMSF marking for winter tires|Coincidence of load and speed indices|No external defects (cracks, swelling)

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6. Studded tires: marking features

If the tire is studded, this must be indicated in the marking. Typically you will see one of the following notations:

• ❄️⚡ Studded or Studdable - studded tire.
• 🔨 Metal Studs - metal spikes.
• 🚫 Non-Studded — studless winter tires (Velcro).

In Russia, starting from 2021, there are rules governing the use of studded tires:

• 📅 Approved for use with October to April (times may vary in some regions).
• 🚗 Tires must be on the same axle same type (either all studded or all Velcro).
• 🔧 The number of studs on a tire is standardized by GOST R 58398-2019: no more 60 studs per linear meter tread.

⚠️ Attention: Europe has stricter rules. For example, in Germany studded tires prohibited (only Velcro with markings are allowed 3PMSF), and in Finland the presence of thorns is mandatory in winter. Check local requirements before traveling abroad!

7. Marking of American and Japanese tires: what is the difference?

Tires produced for the American or Japanese markets may have additional markings that are not found on European tires. Here's what they mean:

• 🇺🇸 DOT - Mandatory marking for tires sold in the USA. After it comes the plant code and production date.
• 📊 UTQG (Uniform Tire Quality Grading) is a system for assessing tire quality based on three parameters:
  • Treadwear (wear resistance, e.g. 400 - the higher, the longer it will last).
  • Traction (clutch: A, B or C).
  • Temperature (heat resistance: A, B or C).
• 🇯🇵 JATMA - Japanese labeling standard, similar to European E. May contain information about maximum load at different pressures.
• 🔋 LT (Light Truck) - a tire for light trucks or SUVs. Has a reinforced design.

If you are buying tires used from USA or Japan, please note:

• 📅 Production date (American tires are often “stale”).
• 📏 Size in inches (e.g. 31x10.5 R15 instead of the usual metric notations).
• 🚛 Load index - American tires can be designed to carry more weight.

FAQ: Answers to frequently asked questions about tire markings

🔍 How to decipher the inscription 91T on a tire?

91 — load index (615 kg per wheel), T — speed index (up to 190 km/h). These parameters must comply with the recommendations of your vehicle manufacturer (indicated in the operating instructions or on a sign in the doorway).

❄️ Is it possible to drive in winter on tires marked M+S, but without 3PMSF?

Formally, yes, but in a number of regions of Russia (for example, Moscow, St. Petersburg) mandatory labeling is required from 2021 3PMSF for winter tires. Tires only with M+S are considered all-season and may not provide sufficient traction on snow and ice. The risk of a fine is 2000 rubles.

📅 What to do if the tire has a production date of 3 digits (for example, 125)?

These are tires manufactured before 2000. These tires strictly prohibited use - rubber becomes brittle after 20+ years and can break on the move. According to traffic regulations, the use of tires with erased or illegible markings is prohibited.

🔄 What do the words Rotation and the arrow on the tire mean?

This indicates the direction of rotation for directional tires. The arrow shows which direction the wheel should rotate when moving forward. If you place the tire against the arrow, drainage and grip will deteriorate and wear will accelerate. There is no such marking for non-directional tires.

🇷🇺 Do I need to register a tire change with the traffic police?

No, from 2021 registration of seasonal tire changes has been cancelled. However, you obliged use tires that correspond to the season (winter - from December to February, summer - from June to August). For violation - a fine of 2000 rubles under Part 1 of Art. 12.5 Code of Administrative Offenses of the Russian Federation.