This is how you can interpret the temperature grade of your car tires


We have given you various safety tips and performance parameters regarding tires. In this article, we’ll help you understand what temperature grade of the tire is?

Well, with a little explanation it is easy to interpret and understand what all of the letters and numbers mean on your vehicle’s tire sidewall. Those numbers indicate the size, type and performance of the tire. If the tire has a letter “P” at the beginning of the “Tire sizes”, it means that the tire is a P-Metric tire, which is made to certain standards within the United States. If a tire size has no letters at the beginning, this indicates a “Euro-metric tire”. Euro-Metric and P-Metric tires may have different load capacities.

In the United States, the National Highway Traffic Safety Administration (NHTSA) came up with a uniform Tire Quality Grading (UTQG). UTQG aims to provide a standardized grading system to consumers, helping them with useful information while purchasing tires based on their relative treadwear ratings, temperature ratings and traction ratings. These grades are assigned by the manufactures and are based on the results of their tests. Tests on tires were conducted by the independent testing company.

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Now, as for the temperature Grade, the UTQG Temperature Grade specifies the extent of heat being dissipated and generated by tire during the drive. Over time, excessive heat can damage rubber of your tire. Below mentioned, A, B and C are the temperature grades from highest to lowest.

These grades are established by measuring the ability of a loaded tire at various speeds without failure and by running an inflated test tire against a large diameter high-speed laboratory test wheel.

Temperature Rating     Speed (km/h)

A                                    185

B                                    160 – 185

C                                    135 – 160

However, all UTGQ rated tires must be able to operate safely at least 85 miles per hour. While the temperature rating can help you in choosing the best tire for extremely hot driving conditions, it does not necessarily give you sufficient information regarding the effects of heat resistance on treadwear and overall durability of your tires.

Right after treadwear of the tire, you can easily find the temperature grading at the sidewall of the tire. 

temp tire

It should also be very important to mention here that tires are kept in the controlled environment while they are being tested. The tester makes sure that not only the tire is properly inflated but also there is no load on the testing vehicle. Therefore, when you drive, your vehicle’s tire will generate heat if tires are under-inflated. Driving conditions, vehicle load, road surface and ambient temperature etc. are the other factors which can affect the tire.