Tire Temperature Rating Chart: A vs B vs C
What the UTQG temperature grade on your tire sidewall actually means — the heat-resistance levels, the real meaning of 500 A A and 340 A A, and when Temperature A is worth paying attention to.
Tire Temperature Rating Chart (UTQG — Quick Answer)
Speed tested: 115 mph and above
Max heat: Up to 249 °F (121 °C)
Best for: Performance tires, towing, hot climates, sustained highway driving
Speed tested: 100–115 mph
Max heat: Up to 230 °F (110 °C)
Best for: Most passenger cars and SUVs at legal US/EU highway speeds
Speed tested: 85–100 mph
Max heat: Up to 212 °F (100 °C)
Best for: Light-duty city/suburb driving; avoid for towing, heavy SUVs, or hot regions
Real Sidewall Decoder: What “500 A A” or “340 A A” Means
This means the tire has a UTQG treadwear grade of 500, a wet-braking traction grade of A, and the highest temperature resistance grade of A. In plain English: longer projected tread life than a 340-rated tire, strong wet traction, and the best heat resistance available under the UTQG scale.
Best fit: Daily drivers, highway commuters, hot climates, and buyers who want a balanced all-season tire with strong heat resistance.
This means the tire has a lower treadwear grade than 500, but still carries Traction A and Temperature A. In plain English: it will usually trade some tread life for more grip or sportier performance, while still offering the highest UTQG heat resistance grade.
Best fit: Performance-oriented all-season or summer tires where grip matters more than long tread life.
Quick takeaway: If your tire says TEMPERATURE A, it has the highest UTQG heat-resistance grade. That means it performed better in the standardized high-speed heat test than a Temperature B or C tire. It does not mean the tire is best at everything — tread life and grip still depend on the treadwear and traction grades beside it.
Speed ranges are standardized lab-test thresholds, not recommended driving speeds. Grades assume correct inflation and no overload.
A = Best heat resistance · C = Minimum legal standard
UTQG Temperature
A
Sustained Speed Capability
Sustained test speeds above 115 mph (185 km/h)
General Meaning
Grade A tires demonstrate the highest resistance to heat generation in laboratory testing. They can operate safely and dissipate heat effectively at sustained high speeds.
Commentary
Recommended for high-performance vehicles, aggressive driving, and hot climate regions. Grade A tires are common on all-season, ultra-high-performance, and touring tires. They provide the best margin of safety against heat-related blowouts.
Best For
Highway driving, performance cars, hot climates, sustained highway cruising
UTQG temperature grades are assigned from controlled laboratory tests and apply mainly to many passenger car tires sold in the US. Real-world performance also depends on load, inflation pressure, speed, ambient temperature, and tire age or condition. Not all tire types carry UTQG markings. Always check the sidewall and follow your vehicle and tire manufacturers' recommendations.
UTQG Temperature Grade Comparison — click to select
| Grade | Speed Range | Notes |
|---|---|---|
| A | > 115 mph / 185 km/h | Highest heat resistance; best for sustained high-speed use |
| B | 100–115 mph / 160–185 km/h | Intermediate; above minimum but not top tier |
| C | 85–100 mph / 137–160 km/h | Minimum US legal standard |
AI Insight
Powered by AIGet a plain-English explanation of your results — what they mean for your vehicle and driving experience.
How to Use This Tool
- 1Locate the UTQG block on your tire sidewall — it reads like “TREADWEAR [number] TRACTION [letter] TEMPERATURE [letter]” or simply “500 A A.”
- 2Use the interactive explainer to select Grade A, B, or C and compare the lab speed and heat thresholds.
- 3If your tire says “500 A A” or “340 A A,” focus on the last A — that final letter is the temperature grade.
- 4If you tow, drive in hot climates, use a heavy vehicle, or spend a lot of time on the highway, prioritize Temperature A.
Tire Temperature Rating A vs B — Full Comparison
Grade A and Grade B are the most commonly misunderstood comparison. Here is the practical difference across the dimensions real buyers care about.
| Dimension | Grade A | Grade B |
|---|---|---|
| Lab test speed threshold | Above 115 mph (185 km/h) | 100–115 mph (160–185 km/h) |
| Max heat in test (°F) | ≤ 249 °F (121 °C) | ≤ 230 °F (110 °C) |
| Typical vehicle type | Performance cars, trucks, tow vehicles | Standard passenger cars, crossovers |
| Towing suitability | Yes — preferred for trailer towing | Marginal — check load index first |
| Hot climate (desert, summer south) | Best choice | Adequate for moderate heat |
| Long sustained highway (>1 hr) | High safety margin | Adequate at legal speeds |
| Underinflation risk amplification | Lower — more heat headroom | Moderate — less buffer if pressure drops |
| Typical speed rating alignment | H (130 mph), V (149), W (168), Y (186) | S (112 mph), T (118), H (130) at lower end |
| Consumer Reports prevalence | Most all-season and UHP tires | Economy and budget passenger tires |
| Price premium | Moderate — not significantly more | Slightly less expensive at budget tier |
What Actually Causes Tire Heat
A temperature grade is assigned under controlled conditions. These are the real-world things that push any tire toward dangerous heat.
📉 Underinflation
A soft tire flexes more with every rotation — that flexing generates heat internally. At 20% below recommended pressure, internal temperature can rise significantly enough to override even a Grade A rating.
⚡ Speed
Heat generation is proportional to the square of speed. Doubling your speed roughly quadruples heat generation rate. Even a Grade A tire has a physical limit — the UTQG test only grades it, it does not remove the limit.
⚖️ Overloading
Exceeding a tire's load index forces the sidewall to flex further with each rotation. Like underinflation, this excess flexing converts mechanical energy to heat inside the tire carcass.
☀️ Ambient temperature
On a 95 °F (35 °C) summer day, your tire already starts 27 °F above a 68 °F baseline. Adding highway speed and load compresses the margin between operating temperature and the Grade C ceiling (212 °F) significantly.
🔧 Low aspect ratio / run-flat construction
Ultra-low-profile tires (35 series and below) have less sidewall to dissipate heat. Run-flat tires carry a reinforced sidewall that generates more heat under normal use. Both types especially benefit from Grade A.
When Do You Need Temperature Grade A?
Match your driving situation to the right temperature-grade target.
| Your Situation | Why Heat Matters Here | Verdict |
|---|---|---|
| Towing a trailer | Added weight increases sidewall flex and heat. A higher temperature grade gives you more margin during long loaded highway runs. | Grade A required |
| Performance / sports car | Track days, mountain roads, and aggressive driving sustain high speeds that approach and exceed Grade B's lab threshold. | Grade A required |
| Heavy SUV or pickup | A large SUV or truck already puts high load on tires at highway speed, especially when loaded with passengers and cargo. | Grade A strongly recommended |
| Desert summer highway driving | Starting ambient temperature of 100 °F+ compresses the thermal margin between normal operating temperature and Grade B or C limits. | Grade A strongly recommended |
| Daily highway commuter (50–75 mph, temperate climate) | Grade B is generally adequate. Typical legal-speed highway use stays well within the Grade B lab speed threshold. | Grade B adequate |
| City / suburban low-speed driving | Heat rarely becomes an issue at stop-and-go speeds. Grade B or C can be functionally adequate here if inflation and load are correct. | Grade B or C fine |
| Winter / snow tires | Most dedicated winter tires are UTQG-exempt. Temperature grade often does not appear — check the speed rating instead. | Not applicable (UTQG exempt) |
How to Read the Temperature Rating on Your Tire Sidewall
Example sidewall UTQG block #1:
This means the tire has a treadwear grade of 500, Traction Grade A, and Temperature Grade A. The last letter is the temperature grade, so this tire has the highest UTQG heat-resistance level.
Example sidewall UTQG block #2:
This means the tire still has Traction A and Temperature A, but a lower treadwear grade than 500. In real-world terms, a 340 A A tire is often more performance-focused, with stronger grip potential but shorter projected tread life than a 500 A A tire.
How to read any UTQG string: first number = treadwear, middle letter = traction, last letter = temperature. So in both 500 A A and 340 A A, the final A is the tire temperature rating.
Temperature Rating vs Speed Rating
These are related, but they are not the same thing. A smart buyer checks both.
| Aspect | Temperature Rating (A/B/C) | Speed Rating |
|---|---|---|
| What it measures | How well the tire resists and dissipates heat in a lab drum test | Maximum speed the tire structure can sustain over time |
| Grading scale | A (best), B, C (minimum allowed) | Letters such as S, T, H, V, W, Y, Z |
| Where found on sidewall | UTQG block: TEMPERATURE A/B/C | Service description suffix, e.g. 225/55R17 97V — the V |
| Applies to all tires? | No — many winter, LT, spare, and trailer tires are exempt | Yes — tires still carry a speed category or service limitation |
| Higher = safer? | Generally more heat margin, especially in hot or loaded use | Higher structural speed capability, but not a substitute for the right temperature grade |
| Key takeaway | Tells you heat resistance | Tells you structural speed capability |
Tire Types Exempt from UTQG Temperature Grading
If you cannot find a UTQG block on your tire, it likely falls into one of these categories.
| Tire Type | Why Exempt |
|---|---|
| Dedicated winter / snow tires (3PMSF marked) | Different testing priorities — cold traction matters more than high-speed heat grading. |
| Light truck (LT) tires with deep tread | These are evaluated more by load range and intended service than passenger-car UTQG labels. |
| Temporary spare tires | They are short-distance emergency tires with a separate limited-use standard. |
| Trailer tires (ST prefix) | Trailer tires use different rating systems focused on load and service conditions. |
| Motorcycle, ATV, and off-road specialty tires | These fall under different regulatory frameworks and use cases. |
How UTQG Temperature Grades Are Assigned
The UTQG temperature grade is based on a controlled high-speed drum test. The tire is run under standardized load and inflation conditions and must survive increasing speed stages without heat-related structural failure.
A tire that survives the most demanding heat and speed stages earns Grade A. One that passes lower stages but not the top stages may earn Grade B. Grade C is the minimum allowed level for passenger tires that fall under UTQG rules.
Frequently Asked Questions
Temperature grades and thresholds on this page are educational summaries of the UTQG system. Real-world tire temperatures depend on inflation pressure, load, speed, ambient temperature, and road conditions. Always follow your vehicle manufacturer’s tire specifications and consult a qualified tire professional for safety-critical fitment decisions.