Load Range G tires are rated to carry a maximum of 3,640 pounds per tire when properly inflated

Load Range G is a tire classification that tells you the heaviest load a single tire can support at its maximum recommended air pressure. The letter G is the highest load range for passenger and light-truck tires — it means the tire has been engineered and tested to handle significantly more weight than lower load ranges like D, E, or F.

The weight capacity of 3,640 pounds applies when the tire is inflated to its maximum pressure, which is printed on the tire's sidewall. If you underinflate a Load Range G tire, its weight capacity drops. Conversely, you cannot exceed the maximum pressure printed on the tire itself, even if you own a heavy vehicle — the tire's physical limit is the limit.

Load Range G tires are most common on pickup trucks, SUVs, and commercial vehicles that regularly carry heavy payloads or tow trailers. Passenger cars almost never use them. If you are replacing tires on a truck or large SUV, the owner's manual or the tire placard on the driver's door jamb will tell you which load range your vehicle requires.

Key Takeaways

  • Load Range G tires can support up to 3,640 pounds per tire at maximum air pressure, making them suitable for heavy trucks and commercial use.
  • The weight capacity only applies when the tire is inflated to the maximum pressure listed on the tire's sidewall — underinflation reduces capacity.
  • Your vehicle's tire placard (usually on the driver's door jamb) specifies which load range your vehicle needs; you should not use a lower load range as a replacement.
  • Load Range G is the highest rating for standard passenger and light-truck tires; heavier commercial vehicles may require special tires rated differently.

How load range letters work

Tire load ranges are labeled with letters from A to G, with each letter representing a higher weight capacity. The progression is not random — each step up in load range means the tire's internal structure (the number and thickness of fabric layers called plies) is reinforced to handle more stress.

Load Range D, for example, supports 1,220 pounds per tire. Load Range E supports 1,406 pounds. Load Range F supports 1,587 pounds. Load Range G, at 3,640 pounds, is a significant jump because it is designed for vehicles that carry heavy cargo or tow substantial weight regularly. The higher the load range, the stiffer the tire sidewall and the more robust the internal construction.

The letter itself does not appear on every tire — some tires show the load index as a number instead (for example, "120" might correspond to a certain load range). Always check the tire's sidewall or the manufacturer's specification sheet to confirm the load range or load index of any tire you are considering.

Where to find your tire's load range

The load range letter appears on the tire's sidewall, printed as part of the tire size designation. A typical sidewall marking might read "LT245/75R16 Load Range G" or straightforward "LT245/75R16 G". The "LT" prefix stands for "light truck" and is common on tires rated Load Range F or G.

Your vehicle's required load range is listed on the tire placard, a label usually found on the driver's door jamb, inside the fuel door, or in the owner's manual. The placard shows the recommended tire size and load range for your specific vehicle. This is the authoritative source — follow it rather than guessing based on your vehicle's size or weight.

If you cannot locate the placard or are unsure which load range your vehicle needs, contact the vehicle manufacturer or a tire retailer with your vehicle's year, make, and model. They can tell you the correct specification in seconds.

Why load range matters when replacing tires

Using tires with a lower load range than your vehicle requires is unsafe. If your truck is rated for Load Range G but you install Load Range F tires, the tires may overheat, wear prematurely, or fail under the weight they are carrying. The vehicle's weight does not change — the tires still have to support it — but the tires are not built for that load.

Using a higher load range than required is generally safe and is sometimes done intentionally for durability, but it is not necessary. A Load Range G tire will not improve your truck's handling or performance if your vehicle only needs Load Range E. It will cost more and may ride slightly stiffer, but it will not damage anything.

When you replace tires, match the load range on your vehicle's placard exactly. If the placard specifies Load Range G, buy Load Range G. If it specifies Load Range E, do not substitute Load Range G thinking it is "better" — stick with what the manufacturer engineered the vehicle to use.

Load range versus load index

Some tires use a load index — a two- or three-digit number — instead of a letter. Load index 120, for example, corresponds to a weight capacity of 1,543 pounds per tire. Load index numbers go higher than 120 for heavy-duty tires, and the relationship between the number and weight capacity is not linear — each step up does not add the same amount of capacity.

Load index and load range are two different ways of communicating the same information. A tire might be labeled "Load Range G" or "Load Index 120" depending on the manufacturer's preference and the tire's intended use. Check your vehicle's placard to see which system it uses, then match that specification when you shop for replacement tires.

If you see a tire labeled with both a load range letter and a load index number, both are correct — they are just two ways of describing the same tire's capacity. Use whichever one your vehicle's placard specifies.

Common mistakes when choosing load range tires

The most common error is assuming that a bigger truck needs a bigger load range letter. Load range is not about the vehicle's size — it is about the weight the tires must support. A large SUV might use Load Range E, while a smaller pickup truck with a heavy payload capacity might use Load Range G. Always check the placard, not the vehicle's appearance.

Another mistake is confusing load range with tire size. A tire marked "LT265/70R17 Load Range G" is not automatically better than "LT245/75R16 Load Range G" just because the first number is larger. The first number is the tire's width in millimeters. Load range and tire size are independent specifications — you need both to match your vehicle's requirements.

A third mistake is buying used tires without verifying their load range. A used tire might be the right size but the wrong load range, and there is no way to know without reading the sidewall carefully. Always inspect the sidewall of any tire before installation.

Inflation pressure and load range

The weight capacity of a Load Range G tire assumes the tire is inflated to its maximum recommended pressure. This maximum pressure is printed on the tire's sidewall and is different from the pressure recommended for your vehicle. Your vehicle's recommended pressure (found on the placard) is usually lower than the tire's maximum pressure, because the vehicle is designed to operate at that lower pressure for comfort and efficiency.

If you underinflate a Load Range G tire — for example, running it at 60 psi when the maximum is 80 psi — the tire's weight capacity decreases. The tire cannot support its full 3,640-pound rating at a lower pressure. Underinflated tires also wear faster and generate more heat, which can lead to failure.

Always inflate your tires to the pressure listed on your vehicle's placard, not the maximum pressure on the tire. The placard pressure is what the vehicle manufacturer determined is safe and appropriate for your specific vehicle. Check tire pressure monthly and before long trips, because pressure changes with temperature and normal use.

Frequently Asked Questions

Can I use Load Range G tires on a vehicle that only needs Load Range E?

Yes, it is safe to use a higher load range than required. Load Range G tires will support your vehicle's weight without any problem. However, they will cost more and may ride slightly stiffer. There is no performance benefit to oversizing the load range, so most people stick with what the manufacturer specifies.

What happens if I use Load Range E tires on a truck that requires Load Range G?

The tires may overheat, fail prematurely, or rupture under the weight they are carrying. Your truck's weight does not change — the tires still have to support it — but Load Range E tires are not built for that load. Always match the load range on your vehicle's placard.

Is Load Range G the highest rating available?

Load Range G is the highest for standard passenger and light-truck tires. Heavy-duty commercial vehicles and trailers use different tire classifications and may be rated higher. For most pickup trucks and SUVs, Load Range G is the maximum you will encounter.

How do I know if my tires are Load Range G?

Read the sidewall of the tire. The load range letter (or load index number) is printed there as part of the tire size designation. If you cannot see it clearly, use a flashlight or take a photo and zoom in. The tire placard on your vehicle will also tell you what load range your vehicle requires.

Does Load Range G mean the tire is heavier or more durable?

Load Range G tires have a reinforced internal structure to handle more weight, so they are slightly heavier than lower load ranges. They are not necessarily more durable in terms of tread life — durability depends on the tire's tread compound and design, not the load range. A Load Range G tire will last as long or as short as any other tire depending on its quality and how you maintain it.