Tyre Markings 2026: M+S vs 3PMSF, and the DOT Age Code
M+S is self-declared, 3PMSF is tested on snow, and DOT 2523 means week 25 of 2023. Decode 205/55 R16 91V and every other stamp on your sidewall.
M+S (Mud and Snow) Marking
The M+S marking (also written as M&S, M/S, or M-S) stands for Mud and Snow. You will find it on the sidewall of your tyre. This marking indicates that the tyre has a tread pattern designed to provide better performance in mud and light snow compared to a standard summer tyre.
What M+S means in practice:
- The tread pattern has larger gaps and deeper grooves for better grip on soft surfaces
- Performance in mud and light snow is improved over summer tyres
- The rubber compound is not necessarily optimized for cold temperatures
- M+S tyres may lose significant grip on ice and hard-packed snow
- Many all-season tyres carry the M+S marking
3PMSF (Three Peak Mountain Snowflake)
The 3PMSF symbol — a mountain outline with three peaks and a snowflake inside — is the gold standard for winter tyre certification. Unlike M+S, this marking requires the tyre to pass a standardized braking test on packed snow (as defined by UNECE Regulation 117).
What 3PMSF means in practice:
- Verified winter braking performance through standardized testing
- Rubber compound designed to remain flexible in cold temperatures (below 7°C)
- Superior grip on snow and ice compared to M+S-only tyres
- Increasingly required by European countries as the minimum standard for winter tyres
- All 3PMSF tyres also carry the M+S marking (but not vice versa)
M+S vs 3PMSF — Key Differences
| Feature | M+S | 3PMSF |
|---|---|---|
| Performance tested? | No | Yes |
| Self-declared? | Yes | No |
| Cold weather compound | Not guaranteed | Required |
| Snow braking | Variable | Certified |
| Ice performance | Variable | Superior |
| Legal in EU as winter tyre | Some countries (legacy) | All countries |
| Found on all-season tyres? | Very common | Some premium models |
| Recommended for winter? | Mild winters only | Yes — all winters |
Reading Your Tyre Sidewall
Your tyre sidewall contains a wealth of information. Here is how to decode a typical marking like 205/55 R16 91V:
Speed Ratings Explained
The speed rating letter on your tyre indicates the maximum speed the tyre is designed to sustain safely. You must always use tyres with a speed rating equal to or higher than your vehicle manufacturer's recommendation.
| Rating | Max Speed (km/h) | Max Speed (mph) | Typical Use |
|---|---|---|---|
| Q | 160 | 99 | Winter tyres, off-road |
| R | 170 | 106 | Heavy-duty light trucks |
| S | 180 | 112 | Family sedans, MPVs |
| T | 190 | 118 | Family sedans, minivans |
| H | 210 | 130 | Sport sedans, coupes |
| V | 240 | 149 | Sports cars |
| W | 270 | 168 | Performance sports cars |
| Y | 300 | 186 | Supercars |
Load Index Guide
The load index number indicates the maximum weight each tyre can safely support when properly inflated. Common load indices for passenger vehicles:
| Index | Max Load (kg) | Index | Max Load (kg) |
|---|---|---|---|
| 75 | 387 | 91 | 615 |
| 80 | 450 | 94 | 670 |
| 82 | 475 | 97 | 730 |
| 85 | 515 | 100 | 800 |
| 87 | 545 | 104 | 900 |
| 89 | 580 | 110 | 1060 |
DOT Date Code — How to Check Tyre Age
Every tyre has a DOT (Department of Transportation) code on its sidewall. The last four digits tell you when the tyre was manufactured:
Tyre age guidelines:
- 0-5 years: Normal use. Inspect regularly for wear and damage.
- 5-6 years: Have tyres professionally inspected annually.
- 6-10 years: Consider replacement even if tread depth appears adequate. Rubber degrades over time, reducing grip and increasing blowout risk.
- 10+ years: Replace immediately. Most tyre manufacturers and safety organizations recommend a maximum tyre age of 10 years.
EU Tyre Label System
Since 2012, all tyres sold in the European Union must carry a standardized label (updated in 2021). The label rates three key performance areas:
Fuel Efficiency (A to E): Rolling resistance affects fuel consumption. An A-rated tyre can save approximately 7.5% fuel compared to an E-rated tyre.
Wet Grip (A to E): Braking performance on wet roads. The difference between A and E ratings can be up to 18 metres of stopping distance at 80 km/h.
External Noise (dB): The noise level the tyre produces, measured in decibels. Lower is quieter. Class A (quiet) to Class C (loud).
Additionally, the updated 2021 label includes:
- Snow grip icon (3PMSF) — if applicable
- Ice grip icon — for tyres tested on ice (Nordic use)
- QR code linking to the EPREL product database for full specifications
Summer vs Winter vs All-Season Tyres
Summer Tyres
Designed for temperatures above 7°C. Summer tyres use a harder rubber compound that provides excellent grip on dry and wet roads in warm conditions but becomes dangerously rigid in cold weather. They have shallower tread patterns optimized for water evacuation and road contact.
Winter Tyres
Engineered for temperatures below 7°C. Winter tyres use a softer rubber compound with higher silica content that maintains flexibility in freezing temperatures. The tread features thousands of tiny slits (sipes) that create additional gripping edges on snow and ice. They carry M+S and/or 3PMSF markings.
All-Season Tyres
A compromise between summer and winter performance, suitable for mild climates with moderate winters. They use a medium-hardness compound and feature moderate siping. Quality all-season tyres may carry both M+S and 3PMSF markings. They are best for regions where temperatures rarely drop below -10°C and heavy snowfall is uncommon.
Legal Requirements by Country
Winter tyre regulations vary significantly between countries. Here is a quick overview for popular driving destinations:
| Country | Winter Tyres | Studded Tyres | Min Tread |
|---|---|---|---|
| Situational | Prohibited | 1.6 mm | |
| Situational | Restricted | 1.6 mm | |
| Situational | Restricted | 4 mm | |
| Not Required | Restricted | 1.6 mm | |
| Situational | Restricted | 1.6 mm | |
| Not Required | Prohibited | 1.6 mm | |
| Situational | Allowed | 3 mm | |
| Mandatory | Restricted | 3 mm | |
| Situational | Allowed | 3 mm | |
| Not Required | Prohibited | 1.6 mm | |
| Not Required | Allowed | 1.6 mm | |
| Not Required | Prohibited | 1.6 mm | |
| Situational | Prohibited | 1.6 mm | |
| Situational | Restricted | 1.6 mm | |
| Situational | Restricted | 1.6 mm | |
| Situational | Restricted | 1.6 mm | |
| Not Required | Prohibited | 1.5 mm |
For complete tyre law details for any country, visit our Tyre Laws by Country section.
When to Replace Your Tyres
Replace your tyres when any of these conditions apply:
- Tread depth at 3 mm — Do not wait for the legal minimum of 1.6 mm. At 3 mm, wet-weather performance is already significantly reduced.
- Age over 6 years — Even with adequate tread, rubber compounds degrade. Check the DOT code.
- Visible damage — Cuts, cracks, bulges, or exposed cords on the sidewall mean immediate replacement.
- Uneven wear — This indicates alignment or suspension issues. Fix the root cause and replace the tyre.
- Vibration — Persistent vibration may indicate internal tyre damage (belt separation).
- Failed repair — Puncture repairs in the sidewall or near the tyre edge are not safe. Replace the tyre.
The two winter marks on a sidewall do not mean the same thing: M+S is a manufacturer’s own declaration with no test behind it, while 3PMSF is awarded only after a standardised snow-braking test — which is why Germany has required 3PMSF on newly produced winter tyres since 2024. The size code reads in order, so 205/55 R16 91V is a 205 mm tread width, a 55% aspect ratio, a radial casing on a 16-inch rim, load index 91 and a V speed rating. Age hides in the DOT stamp: its last four digits are week and year, so 2523 was built in week 25 of 2023, and rubber older than 6 to 10 years is due for replacement whatever the tread depth says. The diagram labels every one of these marks.
Tyre Markings Guide
Decode every marking on your tyre sidewall with this interactive visual guide. Understand size codes, load and speed ratings, manufacturing dates, and winter compliance symbols.
What This Tool Does
Point to any part of the tyre diagram and the guide explains what that marking means. From the size code (e.g., 205/55 R16 91V) to the DOT date stamp, load index table, speed rating chart, and winter symbols (M+S and 3PMSF) — every piece of information on your tyre is covered.
How to Use It
- View the interactive tyre sidewall diagram.
- Click or hover over any marking to see a detailed explanation.
- Use the lookup tables to decode your specific load index and speed rating.
- Check the DOT date code section to determine your tyre’s age.
Why Understanding Tyre Markings Matters
Fitting the wrong tyre size can affect handling and void your insurance. An incorrect speed rating means the tyre may not be rated for motorway speeds. Old tyres (over 6 years) degrade regardless of tread depth. The DOT date code is the only way to verify tyre age — the four-digit code shows the week and year of manufacture.
Data Sources
Marking standards follow ETRTO (European Tyre and Rim Technical Organisation) and USTMA (U.S. Tire Manufacturers Association) specifications. Load index and speed rating tables are based on ISO 4000-1 international standards.