Tread Depth 11/32 vs 13/32: Truck Tire Choice

What tread depth means for a truck tire

Tread depth is the distance from the top of the tread blocks to the bottom of the deepest grooves. On a new tire, this number tells you how much rubber is available to bite into the surface before the tire reaches its legal wear limit. For trucks and SUVs, new tire tread depth commonly ranges from about 10/32 inch to 13/32 inch for highway and all-season tires, depending on the tire's intended use.

The 13/32 figure is at the deeper end of the range for light truck and SUV tires. A deeper tread provides more void space between the blocks, which helps the tire grip loose surfaces like gravel, dirt, and snow. It also provides more rubber to wear through, which often translates to a longer usable life before the tire approaches the wear indicators.

The 11/32 figure is still a full, new-tire depth, but it leans toward on-road priorities. A slightly shallower tread reduces block flex and rolling resistance, which can improve steering response and fuel economy. It also tends to be quieter on the highway because there is less air movement through the grooves. Federal regulations define a tread wear indicator as a projection within the principal grooves that gives a visual indication of the degree of wear of the tread, and that indicator is set at 2/32 inch, which is the legal minimum for passenger and light truck tires in the United States.

Comparing 11/32 and 13/32

The practical difference between 11/32 and 13/32 is 2/32 inch of tread depth. That is two of the 32nds that your tread depth gauge reads. It may sound small, but on a tire that starts at 13/32 and wears to 2/32, a 2/32 difference at the start represents about 18 percent less usable tread rubber.

Where you feel the difference is in three areas: traction on loose surfaces, tread life, and on-road behavior. The 13/32 tire has deeper voids, so it performs better in mud, soft dirt, and fresh snow. The 11/32 tire has shallower voids, so it offers a more planted feel on dry pavement, with less tread squirm during cornering and braking.

Both depths can be found on tires that carry the same load range and speed rating. A tire's load rating, defined by Federal Motor Vehicle Safety Standard No. 139 as the maximum load a tire is rated to carry for a given inflation pressure, is separate from its tread depth. You can find a 13/32 light truck tire with a Load Range E for heavy towing, and you can find an 11/32 tire with the same load range. The tread depth does not change the load carrying capability.

The depth also does not affect the tire's compliance with federal safety standards. Standard No. 139 applies to new pneumatic radial tires for light vehicles and includes requirements for strength, endurance, and high speed performance. A tire with 11/32 tread depth must meet the same endurance and strength tests as one with 13/32, assuming the same size, load range, and construction type. The choice between them is about suitability for your driving, not about one being safer by regulation.

Tire type matters more than the number

When you shop for a tire that measures 11/32 or 13/32, you are usually looking at two different categories of tire. The 13/32 depth commonly appears on all-terrain tires, which are designed for a mix of highway and off-road use. The 11/32 depth commonly appears on highway all-season tires, which prioritize pavement ride comfort, tread life, and low noise.

This matters because the tread depth is not the only variable. An all-terrain tire at 13/32 will have larger tread blocks, wider voids, and a more aggressive pattern than a highway tire at 11/32. The 13/32 depth gives the all-terrain tire the bite it needs on trails, while the 11/32 depth gives the highway tire a stable footprint on asphalt.

If you are comparing a 13/32 all-terrain tire against an 11/32 highway tire, the decision is about your driving environment first. If you spend 90 percent of your time on pavement and only occasionally drive on a gravel driveway, the 11/32 highway tire will likely serve you better with lower noise and better fuel economy. If you regularly drive on unmaintained roads, farm access lanes, or hunting trails, the 13/32 all-terrain tire is the safer choice.

If you are comparing two tires within the same category, such as two all-terrain tires where one is 13/32 and the other is 12/32, the difference is marginal. Look at the tread pattern, void ratio, and compound to decide. You can read more about tire tread pattern types and how they affect performance.

Tread life, wear indicators, and replacement

All new tires sold in the United States must have tread wear indicators molded into the principal grooves. These small rubber bars sit at 2/32 inch. When the tread surface is level with the indicators, the tire is legally worn out in most states. Both a tire that starts at 11/32 and one that starts at 13/32 will reach the 2/32 indicators eventually; the 13/32 tire simply has more rubber to start with.

A 13/32 tire may last longer in terms of miles before reaching the wear bars, but that is only true if the tread wear rate is the same between the two tires. In practice, an aggressive all-terrain tread wears faster on pavement than a highway tread, so the 13/32 all-terrain tire may not outlast an 11/32 highway tire. The relationship between tread depth and tread life depends more on tread compound and pattern than on the starting depth alone.

To get the most from either depth, rotate the tires on schedule and keep them properly inflated. Under-inflated tires wear faster on the shoulders and generate more heat. Over-inflated tires wear faster in the center. You can check the tread depth yourself using a gauge; learn how in how to check tread depth. The same gauge works for both 11/32 and 13/32 readings.

When the tread reaches 4/32 inch, consider replacing tires that will see winter conditions. At 2/32, replace them regardless of season. The difference between 11/32 and 13/32 at the new-tire stage is not as important as the difference between a worn tire and a fresh one.

Which depth should you pick?

Start with the tire category that matches your primary driving. If your truck or SUV stays on pavement, look for highway or touring tires that list 11/32 or 12/32 depth. These give you predictable handling, a quiet ride, and balanced wear. They are also a good match for daily commuting and highway towing.

If your truck or SUV sees unpaved roads, construction sites, or seasonal snow, lean toward all-terrain tires that list 12/32 to 13/32 depth. The extra depth helps the tire clean itself in mud and grip on loose gravel. You can compare specific all-terrain options in the best all terrain tires guide.

For a light truck that spends equal time on highway and off-road, a depth around 12/32 to 13/32 in an all-terrain pattern is the balanced compromise. The best light truck tires guide lists options across this range. For an SUV that only occasionally leaves the pavement, an 11/32 highway all-season tire offers the best fuel economy and lowest noise, as seen in the best car and suv tires guide.

Remember that tread depth is just one specification. Pair the depth with the right load range for your truck, as described in tire load range rating, and with the correct inflation pressure. A well-matched tire with 11/32 depth will outperform a mismatched tire with 13/32 depth.

What to pick for your use

Questions

Is 11/32 tread depth too shallow for a new truck tire?

No. 11/32 is a common new-tire depth for highway and all-season tires. Federal regulations do not specify a minimum new-tire depth, only that tires have tread wear indicators set at 2/32 inch. The legal minimum for a used tire in most states is 2/32 inch.

Does 13/32 tread depth give better traction than 11/32?

On loose surfaces like gravel, dirt, and fresh snow, deeper tread generally provides better grip because the longer blocks can dig into the surface. On dry pavement, a shallower tread like 11/32 can offer better steering response, though the difference is small.

Does deeper tread last longer?

Not necessarily. A 13/32 tire has more rubber to start, so it can last longer if the tread wear rate is the same. But aggressive tread patterns wear faster on pavement, so an 11/32 highway tire may outlast a 13/32 all-terrain tire in highway driving.

Can I replace a 13/32 tire with an 11/32 tire on my AWD vehicle?

You should keep the same tread depth on all four tires on an AWD vehicle to avoid driveline strain. Most manufacturers recommend replacing all four at once, or at least keeping the tread depth difference within a small tolerance. Check your owner's manual for the exact specification.

How do I measure tread depth to confirm the tire is 11/32 or 13/32?

Use a tread depth gauge, which reads in 32nds of an inch. Place the plunger in the deepest groove of the center tread area and press down until the base sits on the surrounding blocks. The measurement is your tread depth. See how to check tread depth.