Wheels and tires. Device, purpose and marking

6.2.10 Tire marking

There are two concepts related to each tire model: standard size and indexes.

For example, the standard size is indicated as follows— 255/55 R16, where 255 – tire section width in millimeters;

55 – the ratio of the tire's section height (from the seat rim to the outer edge of the wheel) to the section width in percent;

R — radial cord structure, the composite cords in the carcass plies are radially arranged (directed from side to side);

16 — rim fit diameter in inches (1 inch = 2.54 cm).

The indices indicate the parameters of the maximum load per tire in kilograms and the speed rating - the maximum permissible speed in kilometers per hour, as well as additional indices that describe the properties of a particular tire.

Figure 6.25 Example of tire marking.

There are two types of markings: for tires of the domestic market and for foreign tires.