If you notice on the sidewalls of car tires, in addition to parameters such as brand, product line, size, year of manufacture. There is another symbol that many of you may wonder about, for example, 91W, E. It is the tires load index vs load range, respectively. So what do each of these symbols mean?

Knowing these parameters, you will see a significant increase in the lifespan of the tires you use every day. And this is also a non-random detail that manufacturers want you to know.

Using suitable tires is very important, affecting the performance and safety of your vehicle. Choosing tires should match the conditions of use of cars. You should understand the standard tire size for your car so that you can choose the right tire.

The tires load index indicates the load capacity of the tire. The higher the value, the heavier load your tires can handle. Drivers should note, never replace the original tire with a maximum allowable load index lower than this parameter. Only using tires has the same or higher load. This will ensure that the tires can withstand the maximum load of cars when driving. For example, if a tire has a load rating of 92. It can support 1,389 pounds at maximum air pressure. Multiply that by four tires (4 x 1,389 = 5,556 pounds) to get the car’s maximum load capacity. You can find the load capacity of some tires in the chart below.

 Load index (LD) Load (lbs) LD (lbs) LD (lbs) 61 567 89 1279 117 2833 62 584 90 1323 118 2910 63 600 91 1356 119 2998 64 617 92 1389 120 3086 65 639 93 1433 121 3197 66 661 94 1477 122 3307 67 677 95 1521 123 3417 68 694 96 1565 124 3527 69 716 97 1609 125 3638 70 739 98 1653 126 3748 71 761 99 1709 127 3858 72 783 100 1764 128 3968 73 805 101 1819 129 4079 74 827 102 1874 130 4189 75 853 103 1929 131 4299 76 882 104 1984 132 4409 77 908 105 2039 134 4674 78 937 106 2094 135 4806 79 963 107 2149 138 5203 80 992 108 2205 142 5842 81 1019 109 2271 143 6008 82 1047 110 2337 144 6173 83 1074 111 2403 145 6393 84 1102 112 2469 146 6614 85 1135 113 2535 147 6779 86 1168 114 2601 148 6944 87 1201 115 2679 149 7165 88 1235 116 2756 150 7385

It will be clearly printed on genuine tires. Making it easier for drivers to choose and buy tires according to their actual needs. Drivers must pay attention to this indicator so that the car can operate at its best. Avoiding tire explosions when the vehicle is driving long distances.

>> Read more: Japanese Tire Brands: Are They Any Good?

If you are learning about tires or are interested in replacing tire sizes from one type of tire to another. It is important to understand the load range, what it means, and how to identify it. So that you install the correct tires for your car.

Tire load range which you can call “ply rating” includes different ply layers. The more layers, the better and stronger the tire is. So manufacturers will calculate the plies of a tire. And use this number to represent load-carrying capacity. Today, the ply rating still indicates a tire’s durability. But because fewer, stronger layers are used, the numbers have been replaced with letters for the load range. For example, Load Range E indicates that the tire is equivalent to a 10-layer construction tire. Tires are not actually made of ten layers, but two or four layers of equal strength. The load range mounted on the sidewall indicates how much load the tire is designed to carry (at a particular pressure). And gauges the amount of air the tire can hold.

Whether you’re owning a regular passenger car or a light truck. Each one gets specially built tires to hold the weight of your car. Each tire comes with its own load range. Light truck tires typically come in a load range B, C, D, E, or F -all with different class ratings. Respectively – 4 plies, 6 plies, 8 plies, 10 plies, or 12-ply, respectively.

Note: Letter “P” stands for “Passenger”, which is a tire for passenger vehicles. Including passenger cars, minivans, SUVs, and other pickup trucks. If you see the letter LT (Light Truck) or T (Temporary) it means a light truck tire or a spare tire, respectively.

Load range is denoted as the different letters from A – N with the absence of I and K to avoid confusion with the digit 1 and a Kilogram (Kilo) respectively.

 Load range Ply rating Maximum air pressure B 4 30 PSI C 6 50 PSI D 8 65 PSI E 10 80 PSI F 12 95 PSI G 14 H 16 J 18 L 20 M 20 N 24

Load ranges for the light truck have the letters B, C, D, E, and F. And they have increased maximum pressure. The lowest pressure is 35 psi for B and C – 50 psi. Pressure increases to 15 from 65 psi, 80 psi, and 95 psi for tires with load ranges D, E, and F.

## FAQs

### What is the tire speed rating?

Speed rating represents the maximum speed at which the tire can load a certain weight (determined by the load index) under the conditions specified by the manufacturer. The speed index is denoted by letters. Each letter corresponds to a specific speed and increases when going from A to Z. Respectively 5km / h to more than 300km / h.

For example, a tire with a tire speed rating: “S” will withstand speeds up to 112 mph. While a tire with an “R” rating will withstand speeds up to 106 mph. Note that this is not the recommended driving speed. You should follow the allowed maximum speed limit on the road.

Tires with a high-speed rating will improve car performance. The spare tire must have a speed rating equal to or higher than the current tire in order to maintain vehicle speed. You’ll find the speed rating on the sidewalls, at the end of the tire size numbers. The speed indicator is always a letter and is usually placed right next to a number. So you can easily find it.

### Load range D or E will be better for your tire?

Load rating indicates how much weight each tire can handle. D is rated for 8 plies with a maximum psi of 65 and an E of 10 plies with a maximum pressure of 80 psi. As mentioned above, E is better for towing as you can fill the tire with more air pressure.

### Do tires with a higher load rating help the car ride more smoothly on rough roads?

The answer is “Not necessary”. As you know, load Indicate relates to the pressure capacity of the tire. And thereby its load-carrying capacity. Smoother tires are the result of many factors. Among them, are the tread design, compound, sidewall flexibility as well as static and dynamic uniformity.