2. Hierarchy: Hierarchy refers to the nominal number of layers in the tire rubber layer, which is not completely consistent with the actual number of layers and is an important indicator of tire strength. Grades are marked in Chinese, such as 12; Mark in English, such as "14P". R ",namely 14 layer pole.
3. Cord material: Some tires are marked separately, such as "nylon", which is generally marked after the layer; Some tire factories use Chinese pinyin initials to mark specifications, such as 9.00-20N and 7.50-20G. N stands for nylon, G stands for steel wire, M stands for cotton thread, and R stands for rayon.
4. Rim specification: indicates the rim specification matched with the tire. Convenient for practical use, such as "standard rim 5.00F".
5. Speed class: indicates the maximum speed that the tire can bear the specified load under the specified conditions. The letters A to Z represent the certified speed grades of tires, ranging from 4.8km/h to 300 km/h. Common speed grades are: q:160 km/h; r: 170km/h； s: 180km/h； t: 190km/h； h:2 10km/h； v:240km/h； w:270km/h； y:300km/h； Z:ZR velocity is higher than 240 km/h; ZR: If ZR appears in the specifications of the tire in the instruction manual. For example, P275/40ZR 1793W, and the highest speed grade ("W" in "93W") is 270 km/h. ..
Tires:
Tire is a round elastic rubber product that is assembled on various vehicles or machinery and rolls on the ground. Usually installed on the metal rim, it can support the car body, buffer the external impact, achieve contact with the road surface and ensure the driving performance of the vehicle. Tires are often used in complex and harsh conditions. They are subjected to various deformations, loads, forces and high and low temperatures during driving, so they must have high bearing performance, traction performance and cushioning performance. At the same time, it also requires high wear resistance and bending flexibility, as well as low rolling resistance and heat generation. Half of the world's rubber consumption is used for tire production, which shows the ability of tire to consume rubber.
Automobile tires can be divided into pneumatic tires and solid tires according to different carcass structures. Most modern cars use pneumatic tires. According to the air pressure in the tire, pneumatic tires can be divided into three types: high pressure tires, low pressure tires and ultra-low pressure tires. Low-pressure tires are widely used in various automobiles. Pneumatic tires are divided into tubeless tires and tubeless tires according to different structures. Tubeless tires are widely used in automobiles. According to the different arrangement of inner ply and buffer layer, tires can be divided into radial tires and bias tires. Radial tires are widely used in automobiles. There are marks on the side of the tire.