Question 1

What do tire temperature ratings A, B, and C mean?

Accepted Answer

Temperature ratings indicate a tire's resistance to heat buildup. Grade A tires can withstand speeds over 115 mph without excessive heat buildup. Grade B tires are rated for 100-115 mph. Grade C tires meet the minimum federal safety standard at 85-100 mph. Most passenger tires are Grade A or B.

Question 2

Does temperature rating affect tire safety?

Accepted Answer

Yes, significantly. Heat is a tire's worst enemy — it degrades rubber compounds, weakens internal structure, and can cause blowouts. Higher temperature ratings mean the tire dissipates heat better, making it safer for sustained highway driving, heavy loads, and hot climates.

Question 3

Are all tires required to have a temperature rating?

Accepted Answer

Most passenger car tires sold in the US must display UTQG ratings including temperature grade. However, winter/snow tires, temporary spare tires, trailer tires, and some specialty tires are exempt from UTQG requirements.

Question 4

Can I use a lower temperature rated tire on my car?

Accepted Answer

You should never downgrade below your vehicle manufacturer's recommended temperature rating. If your car came with Grade A tires, replacing them with Grade C could be unsafe for your typical driving conditions, especially highway driving in hot weather.

Question 5

How is tire temperature rating tested?

Accepted Answer

NHTSA tests temperature rating by running tires on a large test drum at progressively higher speeds. The tire must complete a set distance at each speed without failing. Grade A tires survive the highest speed test, while Grade C tires pass only the minimum required speed.

Question 6

What is tire temperature rating A?

Accepted Answer

Temperature rating A is the highest heat resistance grade under the UTQG system. A Grade A tire can withstand sustained speeds above 115 mph on a test drum without failing due to heat buildup. Most performance, UHP (ultra-high performance), and premium touring tires carry Grade A. If you drive regularly on highways or in hot climates, Grade A is the preferred choice.

Question 7

What is tire temperature rating B?

Accepted Answer

Temperature rating B indicates moderate heat resistance — the tire can withstand speeds of 100–115 mph in testing. Grade B covers the majority of standard all-season and everyday tires. It is perfectly safe for typical highway driving at legal speeds. Only consider upgrading if you regularly exceed 100 mph (track use, autobahn) or live in extreme desert climates.

Question 8

Which tire temperature grade should I choose?

Accepted Answer

Choose Grade A for any highway driving, especially in hot climates — it is the most heat-resistant and safest. Grade B is adequate for most daily drivers if you stay within legal speed limits. Avoid Grade C for highway-capable vehicles; it only meets the minimum federal safety requirement and is typically found on budget or specialty tires. Your vehicle's original equipment tier is a good baseline — never downgrade from the OEM temperature grade.

Feature	Grade A	Grade B	Grade C
Heat Resistance	Highest	Moderate	Minimum
Speed Capability	Over 115 mph	100-115 mph	85-100 mph
Best For	Highway, hot climates, performance	Daily driving, mixed use	Light duty, low speed
Typical Tire Types	Performance, UHP, touring	All-season, standard	Budget, off-road
Hot Climate Safety	Excellent	Good	Adequate
Approximate % of Tires	~45%	~50%	~5%

Tire Temperature Rating A vs B vs C — Safety Guide