UTQG Ratings Explained: Treadwear, Traction, Temperature

Where UTQG lives, and how to read "500 AA A"

Look on the sidewall of most passenger car tires and you'll find a short line like TREADWEAR 500 TRACTION AA TEMPERATURE A. That's the Uniform Tire Quality Grading standard, UTQG for short. It's a federal consumer-information rule, 49 CFR 575.104, and it requires the grades to be molded into the sidewall.

Three grades, three different questions:

Enter any grade string, or pick one, and the explainer breaks it down in words.

Treadwear: a comparison, not a mileage promise

The treadwear grade is the one people over-read.

The federal definition is comparative. A tire's grade reflects its wear rate on a specified government test course against a control tire graded 100. The regulation's own example: a tire graded 150 wore one and a half times as well on that course as a tire graded 100. So a 500 wore five times as well as the control, on that course.

What it isn't:

• It isn't miles. There's no conversion from 500 to any number of miles, and you shouldn't trust one if you see it.
• It isn't your commute. NHTSA's consumer guide says real-world performance "may depart significantly from the norm due to variations in driving habits, service practices and differences in road characteristics and climate."

If you want to know how long tires really last, a mileage warranty or long-term testing tells you more than a treadwear grade. Our guide on how long tires last goes there.

Who assigns the grades?

This is the detail that changes how you use UTQG. The tire manufacturer assigns the grades, based on tests it runs or hires an independent lab to run under the government's procedures. NHTSA doesn't grade tires itself. It can audit the grades manufacturers put on their tires.

The practical upshot: treadwear grades are most useful for comparing tires within one manufacturer's lineup. Tire Rack cautions against comparing treadwear grades across brands, since each maker is grading its own tires. A 500 from one brand and a 500 from another don't necessarily mean the same thing.

Traction: wet, straight-line braking only

The traction grade tells you how the tire stopped on wet pavement in controlled tests on government asphalt and concrete surfaces. From highest to lowest: AA, A, B, C.

Just as important is what it leaves out. Per the federal standard, the traction grade is based on straight-ahead braking and does not include acceleration, cornering, hydroplaning or peak traction characteristics.

For South Florida, that's a real limit. An AA grade tells you something useful about wet braking. It tells you nothing about how a tire handles standing water in the outside lane of I-95 during an afternoon storm. Tread depth and tread design matter there, which is why our tread depth chart and hydroplaning guide exist.

Temperature: heat resistance at speed

The temperature grade shows how well the tire resisted generating heat when run at speed on an indoor laboratory test wheel. Grades are A (highest), B and C.

Cooper Tire gives the speed bands behind each grade:

Per the federal standard, grade C is the minimum level all passenger car tires must meet. So a C isn't a failing grade. It's the baseline every legal passenger tire clears.

Heat is worth caring about in Miami in August, but the temperature grade is a lab measurement under set load and pressure. Correct inflation matters just as much in real life. Keep pressure at the placard number, checked cold. Our guide to Florida heat and tires covers the rest of the heat picture.

Two made-up grade lines, read side by side

Say one manufacturer offers two models in your size, graded like this (these are examples, not real tires):

What you can fairly say: on the government course, Model 1 wore about one and a half times as well as Model 2 (600 against 400). Model 2 scored higher in the wet straight-line braking test, and higher in the lab heat test.

What you can't say: that Model 1 will last 60,000 miles, or that Model 2 won't hydroplane. The grades don't measure either. Still, if wet braking matters more to you than wear, and in a rainy climate it might, the grades at least show which way each model leans.

Tires with no UTQG grades

Don't panic if a tire has no grades. The regulation doesn't apply to:

• deep-tread, winter-type snow tires
• space-saver or temporary-use spare tires
• tires with nominal rim diameters of 12 inches or less
• limited-production tires, as the rule defines them

Using UTQG when you shop

A quick way to put the grades to work:

1. Lock in the non-negotiables first. Size, load index and speed rating come from your vehicle placard. Our tire size guide shows where to find them.
2. Compare treadwear inside a brand. Use it to rank models from the same manufacturer, not to settle a contest between two brands.
3. Read traction as a wet-braking signal. Useful in a rainy climate, but it isn't a hydroplaning score.
4. Treat temperature as a floor check. Every passenger tire meets C; A and B show more heat margin in the lab test.
5. Don't let one grade decide. UTQG is three narrow tests. Tread design, size and how you drive fill in the rest.

When you're ready, browse tires, then line up two to four models on the compare page, where each tire's full spec sheet sits in the same columns. Questions about a specific tire? Call (954) 773-1896 and ask.