Whether you are buying a new set of tires or replacing your old ones, you need to know the different load ratings and what they mean.
One of these classifications is the D-rating that’s indicated on LT tires. But, what exactly are D-rated tires? Here’s all you need to know.
What Are D Rated Tires?
D-rated tires are classified under load range D. Built for light trucks, they have a maximum pressure of 65 PSI (450 kPa). They also have an 8 ply rating which enables them to be inflated and maintain their round shape. D-rated tires only provide more capacity if they are inflated to the higher-rated design pressure.
For more information about D-rated tires, what it means, how they function, how much weight they hold, keep on reading!
What Does D Rating Mean On A Tire?
Light truck (LT) tires have a letter rating used to designate the tire’s load capacity, with the most common load ranges being C, D, and E.
While these ratings represent varying elements in your tire, their differences can be confusing for some drivers.
Tires categorized under load range D are known as D-rated tires.
These ratings are also classified according to increasing maximum pressures. While the lowest pressure is for B tires, it has a 35 PSI, C rated ones have a pressure of 50 PSI, D rated are at 65 PSI, E at 80 PSI, and F at 95 PSI.
Work trucks are mostly under C, D, and E, whereas commercial trucks have load ranges from F through L.
Load range of a tire represents how much load the particular tire is allowed to carry at the maximum specific pressure according to industry standards.
Apart from the PSI, these tires are also differentiated according to ply rating. For instance, D-rated tires have a corresponding ply rating of 8.
When reading these numbers, keep in mind that the load range is determined based on the tire’s construction.
Therefore, the stronger the beads, liner and belts, and all the reinforcements, the greater the pressure that tire can hold.
How Much Weight Can D Rated Tires Hold?
When you read the numbers on the sidewall, the load index indicates the maximum weight the tire can hold when inflated to the recommended tire pressure.
If the numerical value is higher, it matches the tire’s ability to carry heavy loads.
These ratings on the tire load index chart start from 1, which represents 99 pounds and goes up to 150, representing 7,385 pounds.
For instance, an LT245/75R16 tire has a load capacity of 2,623 lbs. for load range D.
Therefore, the higher the load index, the better the tire performs. Tires with higher indices are used to haul cargo or on work trucks.
Even if a tire is strong, it’s advisable to avoid carrying much heavier weights than the tire weight rating. If you go above this, you’ll damage your tires and vehicle’s suspension.
How Long Do D Rated Tires Last?
When buying tires, you might be wondering how many miles do D-rated tires last like other drivers.
Just like other tires, the mileage will vary depending on the individual use, especially since these tires carry a specific load.
D-rated tires will wear out faster if you overload your vehicle and carry more weight than your tires can handle. Additionally, they’ll not last long if they are driven in off-road conditions or by a careless driver.
Furthermore, these ratings are based on tire pressure; hence, if you don’t inflate them properly, they’ll wear out faster than usual.
Therefore, these tires should be replaced as soon as they start wearing out and have them inspected once they get to six years.
Tire manufacturers also recommend that tires be replaced after ten years, even if the tread is still okay.
How Can You Know If Your Tires Are D Rated?
Most first-time car owners might not know how to read your tire; therefore, they might not know if the tires are D-rated.
When you buy your tires, you’ll see a DOT serial number that helps you determine your tires’ age. There are also details about the tire size, diameter, aspect ratio, and load capacity.
If your tire has LT215/65R15 85H indicated, the 85 load index means that your tire can carry up to 1,135 pounds.
To avoid overloading the tires, check the numbers and letters embedded on the sidewall, and if you are not sure, consult your mechanic for guidance.
This is crucial to avoid putting so much weight on the car, which will wear out your tires and suspension fast.
Are Load Range D Tires Good For Towing?
If you need tires for towing, D-rated tires may not be the most ideal because they have an 8 ply rating. To tow safely, you need to use tires that have a 10 ply rating.
D-rated tires will degrade much faster if you use them for towing due to weight issues, making them lose traction on the road.
Load Range D vs. Load Range E
Since most light truck tires use tires with load range D and E, drivers question which is the better option.
When comparing the two load ranges, the major difference is the weight capacity. While D-rated tires are built for 65 PSI maximum pressure, the E-rated ones are meant for 80 PSI.
Therefore, if you have a heavier load, the E-rated tires might be better if they align with the weight and industry standards. On the other hand, if your load is lighter, D-rated tires will be much better.
When using either of these tires, ensure that you inflate the tire to maximum pressure as indicated.
Otherwise, if they are underinflated or overinflated, you could experience tire problems on the road, such as punctures or a blowout.
D-rated tires represent how much load the particular tire is allowed to carry at the maximum specific pressure. These tires are designed for light trucks and have a maximum pressure of 65 PSI (450 kPa). In addition, they also have an 8 ply rating.
You can identify whether your tires are D-rated by reading the letters and numbers on the tire sidewall. This helps to determine how much load your tires can support at maximum pressure.
For your tire to last longer, you have to adhere to the load index and avoid overloading; otherwise, your tires won’t last for long, and you’ll be forced to replace them sooner. However, as soon you notice the tread has worn out, you should consider getting a new set of tires.