Load range tells you the maximum weight a tire can safely carry at a given air pressure
Every tire has a letter printed on its sidewall — usually A, B, C, D, E, or F — that indicates its load range. This letter is your tire's weight capacity. A tire with load range C can carry less weight than one with load range E, even if both are the same size. The higher the letter, the stronger the tire's internal structure and the more weight it can support.
Load range matters because overloading a tire causes it to overheat, wear unevenly, and fail suddenly. Underestimating what your vehicle needs can lead you to buy tires that won't handle your actual load — especially if you tow, carry heavy cargo, or drive a truck or van. Understanding your vehicle's load requirements and matching them to the right load range is a straightforward way to keep your tires safe and your vehicle stable.
Key Takeaways
- Load range is shown as a single letter on the tire sidewall and indicates the maximum weight that tire can carry at its rated air pressure.
- Your vehicle's door jamb label or owner's manual lists the tire size and load range your vehicle was designed for — this is what you should match when buying replacement tires.
- Load range A and B are common on passenger cars; C, D, and E are typical for trucks, vans, and vehicles that tow; F is rare and used only for heavy-duty commercial work.
- A tire with a higher load range requires higher air pressure to reach its rated capacity, so you must inflate according to the vehicle manufacturer's recommendation, not the tire's maximum.
How load range connects to tire structure
Load range is determined by the number of layers of cord fabric — called plies — built into the tire. Each ply adds strength. A load range A tire might have 4 plies; a load range E might have 10. More plies mean a stiffer sidewall, which can support more weight without flexing excessively or generating dangerous heat.
The letter itself is a shorthand for ply rating. Load range A equals 2 plies, B equals 4 plies, C equals 6 plies, D equals 8 plies, E equals 10 plies, and F equals 12 plies. However, modern tire construction is more complex than just counting plies — the materials, cord angle, and rubber compound all affect strength. The load range letter is the standardized way manufacturers communicate a tire's weight capacity, regardless of how they achieve it.
Finding the load range your vehicle needs
Do not guess. Your vehicle manufacturer has already determined what load range you need, and that information is printed on a label inside your driver's side door jamb or in your owner's manual. The label shows your vehicle's tire size and load index — for example, "P225/65R17 102H". The last two characters (102H in this example) include the load index number and a speed rating letter. The load index number corresponds to a specific weight capacity.
To find the load range letter that matches your load index, you can check a load index chart, but the simplest approach is to look at the sidewall of a tire that came on your vehicle or to ask a tire retailer to cross-reference your load index to the load range. Once you know your vehicle's requirement — say, load range C — you should replace tires with the same load range. Using a lower load range is unsafe; using a higher load range is unnecessary but not harmful, as long as you follow the vehicle manufacturer's air pressure recommendation.
Load range differences across vehicle types
Passenger cars typically use load range A or B. These tires are designed for vehicles that carry only people and light cargo. The sidewalls are more flexible, which provides a smoother ride on paved roads.
Light trucks, SUVs, and vans usually need load range C, D, or E. These vehicles are heavier and often carry cargo or tow trailers. The stiffer sidewalls in these load ranges support the extra weight and reduce the risk of the tire rolling under the rim during hard cornering or braking.
Heavy-duty trucks and commercial vehicles may use load range E or F. Load range F is uncommon in consumer tire shopping and is reserved for vehicles designed to carry very heavy loads or operate in demanding conditions like construction sites.
The relationship between load range and air pressure
Load range and air pressure work together. A tire's load capacity is only valid when the tire is inflated to its rated pressure. A load range C tire inflated to 35 psi can carry less weight than the same tire inflated to 50 psi. The tire's sidewall lists the maximum air pressure the tire can handle; your vehicle's door jamb label lists the air pressure you should use.
This is a critical distinction: always inflate your tires to the pressure listed on your vehicle's door jamb, not the maximum pressure listed on the tire. The vehicle manufacturer has calculated the correct pressure for your specific vehicle's weight, suspension, and handling. Overinflating can make the ride harsh and cause uneven wear; underinflating can cause overheating and premature failure. Check your tire pressure monthly and before long trips, using a reliable gauge.
What happens when you use the wrong load range
Using a load range lower than your vehicle requires puts your tires at risk. The tire will flex more than it should, generating excess heat. This heat can cause the rubber to separate from the cord, leading to a blowout. The tire may also wear unevenly or fail suddenly without warning, especially under load or at highway speeds.
Using a load range higher than required is not dangerous — the tire is straightforward stronger than necessary. However, it may cost more and could feel slightly stiffer. The key is that you must still follow your vehicle's air pressure recommendation. Do not inflate a higher-load-range tire to its maximum pressure just because it can handle it; doing so will make the ride uncomfortable and can cause uneven wear.
Reading the load range on your tire sidewall
The load range letter appears on the tire sidewall, usually near the tire size. You may see something like "LT225/75R16 E" or "P225/65R17 C". The letter comes after the tire size and speed rating. If you are standing in front of your vehicle looking at the tire, the sidewall is the outer curved edge of the rubber. The load range is printed there in white or raised lettering, along with other information like the manufacturer name, tire size, and maximum pressure.
If you cannot find the load range on your tire, check the tire's documentation or ask a tire retailer. You can also look up your tire size online — most tire manufacturer websites have a search tool where you can enter the size and see the load range and other specifications.
Frequently Asked Questions
Can I put a higher load range tire on my vehicle if the original is a lower load range?
Yes, as long as the tire size matches and you follow your vehicle's air pressure recommendation. A higher load range is straightforward a stronger tire. However, there is no performance benefit to you, and it may cost more. Stick with the load range your vehicle was designed for unless you have a specific reason to upgrade — for example, if you start towing regularly.
What is the difference between load range and load index?
Load index is a number that corresponds to a specific weight capacity in pounds or kilograms. Load range is a letter that indicates the tire's internal structure and strength. They are related — your vehicle's load index determines which load range tire you need — but they are not the same thing. The load index appears on your vehicle's door jamb label; the load range appears on the tire sidewall.
Do I need a higher load range if I tow a trailer?
Possibly. If your vehicle was designed to tow, the manufacturer has already accounted for that in the load range recommendation on your door jamb label. If you are towing more than the vehicle was designed for, or if you upgrade to towing after purchase, you may need a higher load range. Consult your owner's manual or a tire retailer to confirm what your towing setup requires.
What happens if I inflate my tire to the maximum pressure listed on the sidewall?
The tire will be overinflated relative to your vehicle's needs. This can cause a harsh, uncomfortable ride, uneven wear in the center of the tire, and reduced traction. Always use the air pressure listed on your vehicle's door jamb label, not the maximum pressure on the tire. The door jamb pressure is calculated for your specific vehicle.
Is load range the same as ply rating?
Load range and ply rating are closely related but not identical. Ply rating refers to the actual number of cord layers in the tire; load range is a letter that represents the tire's strength and weight capacity. Modern tires do not always have the same number of physical plies as their ply rating suggests, because tire construction has evolved. The load range letter is the standardized way to communicate weight capacity.