The dimensions are 120/70-14, meaning it has a width of 120mm, a profile of 70, and can be mounted on a 14" diameter rim. The profile of the tires, which is the height of the tire's sidewall, is always referred to as a plain number without a unit of measurement as it is a percentage of the width. For example, a 100/90 tire has a width of 100mm and a profile of 90, meaning it has a profile of 100 x 0.90 = 90mm.
The load index and the speed index are two other important characteristics of the tires. Specifically, the load index is the maximum load under which the tires are expected to function correctly and is described by an integer, which corresponds to kilograms, while the speed index is the maximum speed under which the tires are expected to function correctly and is described by a letter from the English alphabet, which corresponds to km/h. It should be noted that the maximum kilograms corresponding to the load index refer to each tire.
Note: The maximum weight increases proportionally with the number of the load index, meaning the larger the number, the greater the maximum operating weight of the tire. Similarly, the maximum speed increases as the letter of the speed index "increases," meaning the speed index "J" corresponds to a lower speed than that of the "S" index.
In this case, the tire is 55S, meaning the load index and the speed index are 55 and S, respectively.
Users who have purchased them distinguish them mainly because they reach the appropriate temperature quickly.