The service description for a tire is a standardized number that is stamped on the tire right next to the size. That single 4-digit code tells us two things. The first part, 102, is the load index, while the H is the speed rating. A tire's service description consists of a two- or three-digit number followed by a letter.
It is found immediately after the description of the tire size on the sidewall of a tire. The two or three digits that appear after the diameter of the wheel or tire, together with a letter next to it, are known as service descriptions. The service descriptions show the load index of a tire, which defines the maximum load capacity of a tire, together with the speed rating, which determines the maximum speed allowed for the tire. Whether you're changing your tires for a different appearance or for others that perform better, a good starting point for looking for that new tread is the sidewall of one of your current tires.
The numbers and letters on that sidewall represent everything from the type and width of the tire to the aspect ratio, construction type, diameter, load index and speed index. Here's how to read the sidewall of your tires. Without physically inspecting the tires, it's difficult to determine why the tires wore out prematurely. To find out how much weight a tire can support, you'll need a tire load index chart, such as which is shown below.
Tire speed ratings were established to match the speed capacity of tires with the maximum speed of the vehicles to which they are applied. In addition, tires are also identified as light load (LL), standard load (SL) or extra load (XL) tires, which can also be found in tire brands. In addition, the total weight that a set of tires can support is based on a multiple of the load capacity of each tire. You should familiarize yourself with the speed rating that correlates the speed index with the alphabetical character of the tire and stick to it, since you won't find the actual speed rating printed anywhere.
of the tire. This is because if you install tires with a lower load index, you are more likely to overload them. Like the load index, the speed index of a tire is another abbreviated form of referring to how fast a tire can go under ideal conditions. Finally, the last two digits of the tire size refer to the diameter of the wheel or rim to which the tire should be adjusted.
A tire size calculator is a quick way to make sure a new set of tires fits your car, SUV, sports car, light truck or crossover. If you're still not sure about tire service descriptions or need help choosing a set of tires that can handle the task at hand, give us a call. When replacing tires, always choose tires with a load index equal to or greater than original equipment (OE) tires. These types of tires are designed to be used temporarily until a flat tire can be repaired or replaced.
