UTQG ratings explained: treadwear, traction, and temperature grades on your tyre sidewall
What do the three UTQG numbers on a tyre mean?
UTQG (Uniform Tire Quality Grading) is a US NHTSA testing standard that grades tyres on three characteristics printed on the sidewall: treadwear (a number comparing expected wear life — 100 is the government reference tyre, 200 means twice the wear life, 50 means half), traction (a letter grade from AA to C measuring wet-pavement straight-line stopping distance — AA is best), and temperature (a letter grade from A to C measuring heat resistance at speed — A is best). UTQG ratings are determined by tyre manufacturers themselves using standardised testing procedures; they allow comparison between tyres from the same manufacturer more reliably than between different manufacturers.
- UTQG (Uniform Tire Quality Grading) is a US NHTSA testing standard that grades tyres on three characteristics printed on the sidewall: treadwear (a number comparing expected wear life — 100 is the government reference tyre, 200 means twice the wear life, 50 means half), traction (a letter grade from AA to C measuring wet-pavement straight-line stopping distance — AA is best), and temperature (a letter grade from A to C measuring heat resistance at speed — A is best).
- UTQG ratings are determined by tyre manufacturers themselves using standardised testing procedures; they allow comparison between tyres from the same manufacturer more reliably than between different manufacturers.
FAQ
- What do the three UTQG numbers on a tyre mean?
- UTQG (Uniform Tire Quality Grading) is a US NHTSA testing standard that grades tyres on three characteristics printed on the sidewall: treadwear (a number comparing expected wear life — 100 is the government reference tyre, 200 means twice the wear life, 50 means half), traction (a letter grade from AA to C measuring wet-pavement straight-line stopping distance — AA is best), and temperature (a letter grade from A to C measuring heat resistance at speed — A is best). UTQG ratings are determined by tyre manufacturers themselves using standardised testing procedures; they allow comparison between tyres from the same manufacturer more reliably than between different manufacturers.
- What should I verify before using this information?
- Use TireFitLab values as a sizing reference, then verify the vehicle handbook, tire placard, rim compatibility, load rating, and physical clearance before fitting.
What UTQG stands for and where it comes from
UTQG stands for Uniform Tire Quality Grading. It is a system mandated by the US National Highway Traffic Safety Administration (NHTSA) under Federal Motor Vehicle Safety Standard 139 (FMVSS 139). The system was introduced in 1979 and requires tyre manufacturers to grade their passenger car tyres on three characteristics: treadwear, traction, and temperature. The grades must be moulded into the tyre sidewall and included on the tyre label.
UTQG applies to most passenger car tyres sold in the US. Tyres sold in Europe and other markets often carry UTQG markings when the same tyre model is also sold in the US, but European markets use the EU Tyre Label system (fuel efficiency, wet grip, and rolling noise) as the primary consumer-information standard.
Treadwear: what the number means
The treadwear number is a relative index. The government uses a defined course in West Texas (the San Angelo course) over 11,520 km (7,200 miles) of driving and compares wear rates. A reference tyre is assigned a grade of 100. A tyre that wears twice as slowly as the reference tyre receives a grade of 200. A tyre that wears twice as fast receives 50.
| Treadwear range | Life vs reference | Typical tyre types | Grip level | Notes |
|---|---|---|---|---|
| 300 and above | Very long — 3× or more than reference | Grand touring, highway all-season, long-mileage touring tyres | Lower peak dry grip — compound is harder and less tacky | A 400 treadwear tyre has approximately 4× the expected tread life of the government reference tyre. High mileage warranties are typically found in this range. |
| 200–299 | Above average — 2–3× reference | Standard all-season passenger tyres | Good all-round grip | The most common range for standard passenger car tyres. Balances longevity and performance. |
| 100–199 | Average to below average — 1–2× reference | Performance summer tyres, sports tyres, some ultra-high-performance (UHP) | Better peak grip than higher treadwear ratings — softer compound | The reference tyre itself (used for comparison) scores 100. A 120 treadwear tyre lasts 20% longer than the reference. Many UHP summer tyres fall in the 140–180 range. |
| 60–99 | Short — less than the reference tyre | Max-performance summer tyres, track-day road tyres | High peak grip — very soft compound | Very short tread life in normal driving conditions. These tyres are optimised for maximum grip at the cost of longevity. |
| Below 60 | Very short — 1,000–10,000 km typical | Competition/track tyres (some are UTQG-exempt), extreme-performance street tyres | Maximum grip — compound is very soft and tacky | A treadwear of 40–60 is found on extreme-performance street-legal track tyres (R-compound). Below 40 is typical of true racing slicks, which are usually UTQG-exempt. |
Traction: what the letter grade means
The traction grade measures straight-line wet braking from 96 km/h on government test surfaces (both asphalt and concrete). It does not measure dry grip, wet cornering, or winter traction.
| Grade | Wet stopping distance | Test method | Common tyre types | Notes |
|---|---|---|---|---|
| AA | Best — shortest wet straight-line stopping distance | 96 km/h (60 mph) on skid pad — government test surface (asphalt and concrete) | Found on high-performance summer tyres, some all-season UHP tyres | AA is the top grade. Added as a category in 1997 because the A grade population became too large. Not all premium tyres achieve AA — compound and tread design both affect wet braking. |
| A | Good — below AA, above B | 96 km/h (60 mph) on same government skid pad surfaces | Most all-season and touring tyres fall in this grade | The most common traction grade. Many competent all-season tyres that perform well in the real world are rated A, not AA. |
| B | Adequate — longer than A | Same conditions | Some older or budget designs; less common today | B grade indicates adequate wet traction but is noticeably worse than A in the government test. Less common in modern tyre lines. |
| C | Minimum acceptable — longest of the graded types | Same conditions | Very rare — mostly legacy designs | C is the legal minimum for a UTQG-graded tyre sold in the US market. Virtually no modern tyres receive C — it is considered a fail-grade in practice. |
Temperature: what the letter grade means
The temperature grade measures the tyre's ability to dissipate heat at sustained speed. It is tested on a laboratory drum at progressively higher speeds. Heat build-up in a tyre is one of the primary causes of tyre failure at sustained high speeds.
| Grade | Heat resistance level | What it means | Common tyre types | Notes |
|---|---|---|---|---|
| A | Sustained speed above 185 km/h (115 mph) in government test | Best heat dissipation — tyre can sustain high-speed driving without internal heat build-up causing structural damage | Required for tyres sold with a speed rating of V (240 km/h), W, or Y. Most modern performance tyres. | The temperature grade measures heat generation and dissipation, not the tyre's speed rating directly. A tyre with a W speed rating must achieve temperature grade A by the test requirements. |
| B | Sustained speed 160–185 km/h (100–115 mph) in government test | Good heat resistance for normal highway driving | Touring and standard all-season tyres with H or V speed ratings often achieve B. | Adequate for most real-world driving. The test condition (sustained speed on a drum) is more demanding than typical road use — a B-rated tyre has significant thermal margin in normal driving. |
| C | Sustained speed 130–160 km/h (85–100 mph) in government test | Minimum acceptable heat resistance | Lower-speed-rated tyres (S, T, H) | C is the legal minimum. A tyre rated C is safe in normal driving but may be more vulnerable to heat failure during sustained high-speed driving (e.g., long motorway driving in hot conditions when underinflated). |
Which tyres are exempt from UTQG
| Tyre type | Reason for exemption | What to use instead |
|---|---|---|
| Winter / snow tyres | UTQG testing is performed at temperatures and conditions that disadvantage winter compounds. Winter tyres are optimised for temperatures below 7 °C — UTQG treadwear and traction grades at warm test temperatures would be misleading. | Look for the 3PMSF (Three-Peak Mountain Snowflake) symbol and M+S designation instead. |
| T-type spare tyres (space-saver) | T-type spares are temporary use only and are not designed for normal sustained driving. UTQG grading would be irrelevant. | T-type spares have their own speed limitation (max 80 km/h) and are not part of the UTQG programme. |
| Competition / racing tyres | Pure racing tyres (slicks, rain tyres) are not designed for public road use and do not need to meet the consumer-information purpose of UTQG. | Street-legal R-compound tyres (track day / autocross tyres) typically do carry UTQG markings (very low treadwear, high traction). DOT-legal racing tyres must comply even if they have very low ratings. |
| Deep tread off-road tyres (some) | Some light-truck and off-road tyres designed exclusively for off-highway use are exempt. | Most light-truck tyres sold for mixed on/off-road use do carry UTQG markings. |
Limitations of UTQG: what it does not measure
| Limitation | Detail | What to do instead |
|---|---|---|
| Cross-manufacturer comparison is unreliable | Each manufacturer uses their own reference tyre for treadwear grading. A treadwear 300 from manufacturer A is not guaranteed to last as long as a treadwear 300 from manufacturer B — each 300 is relative to that manufacturer's own 100-rated reference tyre, which itself varies. | Use treadwear ratings reliably for within-brand comparisons. When comparing across brands, real-world tyre tests and owner reviews are more informative. |
| Traction grade is wet straight-line braking only | The traction test measures straight-line braking on wet asphalt and concrete at 96 km/h. It does not measure cornering grip, dry grip, hydroplaning resistance, or winter traction. | A tyre with a traction grade of A may perform worse in wet cornering than a competitor with the same grade, because the test does not capture lateral forces. |
| Temperature grade does not directly indicate speed rating | The temperature grade measures heat resistance, which is related to but not the same as speed rating. A tyre with a temperature grade A can sustain above 185 km/h in the test, but the specific maximum speed rating (V/W/Y) depends on the full speed-rating test. | Check the speed rating symbol separately. Temperature grade A is required for V, W, and Y rated tyres. |
| Treadwear does not correlate with wet or dry grip | Higher treadwear number = harder compound = generally longer wear life but lower peak grip. However, modern compound technology means this relationship is not perfectly linear — a 240 treadwear tyre can have better wet grip than a 200 treadwear tyre from an older design generation. | Do not choose a tyre for grip based on treadwear rating alone. Use purpose (daily/performance/track) and independent test results. |
Where to find the UTQG markings on a tyre
UTQG markings are moulded into the tyre sidewall, typically on the upper sidewall area near the tread shoulder. They appear in the format:
TREADWEAR 320 TRACTION A TEMPERATURE A
The three characteristics appear sequentially. They may be spaced over one or two lines on the sidewall depending on tyre width and design. The markings are always in English regardless of the market the tyre is sold in — UTQG is a US-origin standard.
On the EU Tyre Label (which covers tyres sold in Europe), the three categories are different: fuel efficiency (rolling resistance — A through G), wet grip (A through G, with F and G not in use for passenger tyres), and external rolling noise (dB level and star rating). EU wet grip and UTQG traction are both wet braking measures but use different test protocols and are not directly equivalent.
Using UTQG when buying tyres: a practical approach
For a daily driver prioritising longevity: look for treadwear 300+ with traction A or AA and temperature A. You will sacrifice peak grip slightly but gain significantly more km per tyre.
For a performance-oriented driver who values grip and accepts faster wear: look for treadwear 100–200, traction AA, temperature A. These tyres will need replacing more frequently but offer better wet braking and typically better dry response from the softer compound.
For track day use: very low treadwear (60 and below) R-compound tyres. Accept that these will wear significantly faster on road use and are not appropriate as daily tyres. Some track day enthusiasts mount R-compound tyres for events and swap back to road tyres afterward.
More tools
- Tire speed rating chart
- Tyre compound guide
- EU tyre label guide
- Tire tread depth guide
- Tyre wear indicators guide
- Tire & wheel reference guides
Seasonal check
Planning a long summer drive?
Use the budget and running-cost tools before a trip, especially if the current tyres are worn or the replacement size changes diameter.
What changed
- Reviewed deterministic geometry, load/speed references, sitemap inclusion and localized page shell.