Because a tire is a beautifully engineered piece of machinery, a long list of terminology is inevitable.
We see it as a sign of an elegant manufacturing dedication to quality.
It's a great idea to get familiar with some of the technical jargon.
(1) Aspect Ratio
The concept of a tire series is the same as the aspect ratio. A tire's aspect ratio is the percentage that results from the section height divided by the section width multiplied by 100. The lower the figure, the greater a tire's section width.
This means the tire becomes wider and safety increases when driving. As the figure increases, the tire's section height increases, increasing the flexibility of the sidewalls and resulting in a smoother ride.
Accordingly, consumers seek the aspect ratio best suiting their needs but the current trend is for tires that have low aspect ratios for high-speed cars. Hankook Tire has developed the 25 series, a super wide series boasting the highest safety levels. Example: 60 series = (Section height / Section width) X 100 = 60.
A tire's durability is designated by the ply rating (PR). A higher PR number indicates a greater load range for the tire. A similar term is body ply layers. When cotton cord fabric was used, the actual number of body ply numbers was indicated. However, the number of body ply layers has dramatically decreased due to the appearance of cord fabric such as high strength rayon, nylon and polyester. Consumers, who were accustomed to using a tire that had so many body ply layers, understood that the number of layers had decreased due to the high strength cord fabric. However, they began to ask how many layers of the old cotton fabric would correspond to one layer of the new fabric. In answer to their question, the ply rating (PR) came to be used. So while a 6-PR does not mean a tire has in fact 6 layers of body ply layers, the rating does indicate that the tire retains the same strength of having 6 body ply layers.
(3) Ply rating
As an example, the ply rating (PR) can be indicated as 6-PR as well as the alphabet 'C' in load range.
Passenger Car Tire Marking
In the past, tire sizes were indicated using the metric, alphanumeric and numeric indicating methods but nowadays they have been replaced by the ISO (International Standards Organization) method.