Choosing the Best Tires Using UTQG and Tread Depth

The Problem with Tire Shopping

When it was time to replace my tires, I ran into an immediate problem: there are dozens of options in any given size, and the pricing makes no sense at first glance. A tire that costs more than another might have a lower warranty mileage. A tire with an impressive warranty might wear out faster than one without one. After spending hours comparing specs across brands, I found a method that actually cuts through the noise.

Why Warranty Mileage Misleads

Most tire manufacturers advertise a mileage warranty — 65,000 miles, 85,000 miles — but the fine print creates real problems:

• You must rotate your tires on the manufacturer's recommended schedule, typically every 5,000–7,500 miles, with receipts to prove it.
• If the tire wears out early and qualifies for a prorated replacement, it must be replaced with the exact same brand and model. That model may have been discontinued, or a new production run may perform differently than what you bought.
• Even if the tire lasts the rated mileage, a higher-mileage warranty does not mean the tire is a better value. It says nothing about how much rubber you actually get to use.

Price per warranty mile is a flawed comparison. You need a metric grounded in the physical tire itself.

UTQG Treadwear Rating

The U.S. government requires all passenger tires to carry a UTQG (Uniform Tire Quality Grading) stamp. The treadwear component is a relative rating against a government reference tire scored at 100. A tire rated 400 theoretically lasts four times longer than the reference tire. A tire rated 800 lasts eight times longer. This gives you a consistent, cross-brand way to compare how fast a tire wears down.

Tread Depth: The Missing Variable

UTQG alone is not the whole picture. Tires also start with different amounts of rubber, measured in 32nds of an inch. A tire at 12/32″ has more rubber to work through than one at 9/32″, even if both carry the same UTQG rating.

Tires must be replaced when tread depth reaches 2/32″, which is where the wear indicator bars molded into the tread sit flush with the surface. That bottom 2/32″ is never usable. So the rubber you actually get is:

The Formula

Multiplying usable tread by the UTQG rating gives a composite durability score that accounts for both how deep the tire starts and how quickly it wears:

Dividing the price by the composite gives a single cost-per-durability metric. Lower is better.

A Worked Example

Here are two hypothetical tires. Hypothetical 2 costs more and has a higher UTQG rating. Which one is the better deal?

Hypothetical 1 looks like the obvious choice at $100. But Hypothetical 2 has double the UTQG treadwear rating. Despite costing 20% more, it has 40% better value per dollar. The $20 premium buys significantly more rubber life.

Comparison for 205/55R16

Once I narrowed to my actual size and found current pricing, I ran the same calculation. Two tires — the Pirelli P4 A/S Plus Persist and the Goodyear Assurance MaxLife — share the same UTQG rating of 820. The Pirelli is both cheaper and has 1/32″ more tread depth. It wins on both counts.

I bought the Pirelli P4 A/S Plus Persist — 205/55R16 91H.

Compare Tires Yourself

Enter the tires you are considering below. Find the UTQG rating and tread depth on the manufacturer's spec page or on Tire Rack. The $/Composite column is your comparison number — lower is better. Green is the best value, red is the worst.

+ Add Tire Sort by Value