Open Country MT Toyo tires are rugged off-road tires built for trucks and SUVs that spend time on unpaved terrain

Open Country MT is Toyo's line of mud-terrain tires designed for vehicles that regularly leave paved roads. The "MT" stands for mud-terrain, which means the tread pattern is aggressive — with large, widely-spaced blocks — to bite into soft ground, sand, and rocks rather than roll smoothly on asphalt. These tires are heavier and noisier on highways than all-terrain or street tires, but they grip where other tires slip.

Toyo makes several versions of the Open Country line for different purposes. The Open Country MT is the most aggressive off-road option. The Open Country A/T (all-terrain) is a middle ground between street and mud tires. The Open Country H/T (highway-terrain) is closer to a standard truck tire. This guide covers the MT version specifically, since that is what you asked about.

Whether these tires are right for your vehicle depends on how much time you spend off-road, what terrain you encounter, and how much highway driving you do. A person who tows on paved roads most of the time but camps in the desert twice a year faces a different trade-off than someone who works construction on job sites with no roads.

Key Takeaways

  • Open Country MT tires have aggressive tread designed for mud, sand, and rocks, but they are louder and wear faster on highways than all-terrain tires.
  • These tires come in sizes for trucks and SUVs, and you must match the tire size to your vehicle's door jamb label, not to what you think looks right.
  • The sidewall of an Open Country MT tire is reinforced to resist punctures from rocks and branches, which makes them heavier than street tires.
  • Toyo rates Open Country MT tires with a treadwear warranty that varies by size and load rating, typically between 30,000 and 50,000 miles.
  • You can buy Open Country MT tires from tire shops, truck accessory stores, and online retailers, and prices vary based on size and where you purchase.

How the tread pattern affects grip and wear

The Open Country MT tread has large blocks separated by deep grooves. Those blocks dig into soft surfaces — mud, sand, loose gravel — where a street tire's smaller, closer-together blocks would just spin. The deep grooves also channel mud and water away from the contact patch so the tire can grip again on the next rotation.

On pavement, this same aggressive pattern works against you. The large blocks flex more as they roll, which creates heat and wears the rubber faster. The noise comes from those blocks slapping the road as they enter and leave the contact patch. Highway driving in Open Country MT tires typically costs you 20 to 30 percent of tire life compared to an all-terrain tire, and noticeably more compared to a street tire.

If you drive mostly on highways and only occasionally venture onto dirt, an all-terrain tire (like Toyo's Open Country A/T) will last longer and cost less over time. If you spend half your time or more on unpaved terrain, the Open Country MT's off-road grip makes up for the shorter lifespan.

Sidewall construction and puncture resistance

Open Country MT tires have thicker, reinforced sidewalls than standard truck tires. The sidewall is the part of the tire between the tread and the rim, and it flexes as the tire rolls. A reinforced sidewall resists cuts from sharp rocks, branches, and debris you encounter off-road, and it also resists the pinch that happens when you hit a rock at an angle.

This reinforcement adds weight to the tire, which means slightly lower fuel economy and a bit more strain on your suspension. It also means the tire costs more than a comparable all-terrain tire. The trade-off is that you are less likely to suffer a sidewall puncture that forces you to change a tire miles from help.

Sidewall thickness is not listed on the tire label the way tread depth is, so you cannot compare it by looking at a spec sheet. If puncture resistance matters to you — because you work on rough terrain or travel far from repair shops — ask the tire shop whether the Open Country MT is known for durability in those conditions, or read owner reviews from people who use the tires the way you plan to.

Reading the tire size and matching it to your vehicle

Tire sizes look like this: 285/75R16. The numbers mean: 285 is the width in millimeters, 75 is the sidewall height as a percentage of width, R means radial construction, and 16 is the wheel diameter in inches. Changing any of these numbers changes how the tire fits and how your speedometer reads.

Your vehicle's correct tire size is printed on a label inside the driver's door jamb, not on the tire currently on your vehicle. The tire on your vehicle might be the wrong size if the previous owner changed it. Check the door jamb label first. If you want a different size — larger for clearance or a different look, for example — you need to know that changing size affects your speedometer accuracy and may void your warranty.

When you order Open Country MT tires, the shop will ask for your vehicle's year, make, and model, and they will cross-reference that to find the correct size. If you already know your size, you can search for that size directly. Do not guess or order based on what looks right on another truck.

Load rating and speed rating explained

Every tire has a load index (a number) and a speed rating (a letter). The load index tells you the maximum weight that tire can safely carry. The speed rating tells you the maximum speed the tire is rated for. For a truck or SUV, you will typically see load indices between 110 and 130, and speed ratings of Q, R, S, or T (which correspond to 99, 106, 112, and 118 mph respectively).

Your vehicle's door jamb label lists the load and speed rating you need. You must meet or exceed the load rating — you cannot go lower. You can exceed the speed rating, but there is no practical reason to pay more for a higher rating if your vehicle will never approach that speed. Open Country MT tires come in multiple load and speed combinations, so the price you see online might not be the price for the exact rating your vehicle needs.

Load rating matters because it affects the tire's internal structure and how much air pressure it needs. A tire rated for a heavier load has stiffer sidewalls and requires higher pressure. If you install a tire with a lower load rating than specified, you risk overloading it and causing a blowout.

Treadwear warranty and what it covers

Toyo backs Open Country MT tires with a treadwear warranty that typically ranges from 30,000 to 50,000 miles, depending on the size and load rating. This warranty means Toyo will replace the tire at no charge if the tread wears down to 2/32 of an inch before that mileage is reached. If you reach the mileage limit and the tread is still thicker than 2/32 inch, the warranty has expired and Toyo owes you nothing.

The warranty does not cover damage from punctures, impacts, or misuse — such as driving on a flat tire or overloading the vehicle. It also does not cover wear from misalignment, underinflation, or overinflation. To keep the warranty valid, you must maintain proper tire pressure and have the vehicle's alignment checked if you notice uneven wear.

Warranty coverage varies by retailer. Some tire shops offer additional coverage for puncture repair or road hazard damage, which you can purchase at the time of sale. This coverage is separate from Toyo's warranty and is worth considering if you spend a lot of time on rough terrain.

Where to purchase and what to expect for price

You can buy Open Country MT tires from tire specialty shops (like Discount Tire or Tire Rack), truck accessory retailers (like 4 Wheel Parts), big-box stores (like Costco or Sam's Club if you are a member), and online retailers. Prices vary based on tire size, load rating, and retailer. A single tire in a common size might range from $150 to $300, but larger sizes or specialty load ratings can cost more.

When you compare prices, factor in installation and balancing costs, which typically run $15 to $25 per tire at most shops. Some retailers include installation in their advertised price; others do not. Online retailers often have lower prices but charge for shipping, and you may need to arrange installation at a local shop, which adds another step.

Buying four tires at once usually qualifies you for a discount. If you need to replace only one or two tires because of damage, ask the shop whether they can match the tread depth of your existing tires, since mismatched tread depth can affect traction and wear patterns.

Frequently Asked Questions

Can I use Open Country MT tires in snow and ice?

Open Country MT tires are not designed for snow and ice. The aggressive tread pattern works well in mud and sand, but it does not provide the biting edges that winter tires have. If you live in an area with winter weather, you should switch to winter tires during cold months or use all-terrain tires year-round as a compromise.

Do Open Country MT tires need a specific wheel size?

The tire size determines the wheel diameter it fits, but the wheel itself can vary in width and offset. Your vehicle's door jamb label specifies the tire size, which includes the wheel diameter. The tire shop will help you match the tire to a compatible wheel if you are changing wheels at the same time.

How often should I rotate Open Country MT tires?

Rotate your tires every 5,000 to 7,000 miles, or follow the interval in your vehicle's owner manual. Rotation helps even out wear because the front and rear tires wear at different rates. Uneven wear can shorten tire life and affect handling.

What air pressure should I use for Open Country MT tires?

The correct pressure is printed on your vehicle's door jamb label, not on the tire itself. The tire label shows the maximum pressure, which is higher than the recommended pressure. Use the door jamb pressure for normal driving. Some people run slightly lower pressure off-road to improve grip, but this reduces load capacity and increases heat buildup, so do this cautiously.

Are Open Country MT tires good for towing?

Open Country MT tires can handle towing if they have the correct load rating for your vehicle's towing capacity. Check your vehicle's door jamb label to confirm the load rating you need, then verify that the Open Country MT size you are considering meets or exceeds that rating. Heavier loads put more stress on tires, so proper inflation and regular inspection are important.