Tires are an important part of cars. There are more than 10 kinds of markings on car tires. Correct identification of these marks is very important for tire selection, use and maintenance. It is also important for ensuring driving safety and extending tire service life. of great significance.

Tire specifications: Specifications are symbolic data of tire geometric parameters and physical properties. There are three ways to express tire specifications: A. Metric (m); B. Mixed metric and imperial; C. Imperial; Imperial tire specifications are often represented by a set of numbers. The first number represents the tire cross-section width, and the latter number represents the rim diameter, both in The unit is inches. The letters or symbols in the middle have special meanings:

Tire structure: "R" represents radial tires, "D" and "一" represent bias tires.

Others: "XL" means partially reinforced tires, "TG" means engineering tractor and grade machine tires (off-road use), "NHS" means off-highway tires.

Layer

Layer: Layer refers to the nominal number of ply layers in the rubber layer of the tire, which is not completely consistent with the actual number of ply layers. It is an important indicator of tire strength. Levels are marked in Chinese, such as level 12; levels are marked in English, such as "14P.R" which means level 14.

Cord material

Cord material: Some tires are marked separately, such as "nylon" (NYLON), which is usually marked after the layer; some tire manufacturers mark it after the specifications. , represented by the first letter of Chinese Pinyin, such as 9.00-20N, 7.50-20G, etc., N represents nylon, G represents steel wire, M represents cotton thread, and R represents rayon.

Load and air pressure

Load and air pressure: Generally, the maximum load and corresponding air pressure are marked. The load is in "kg", and the air pressure is the tire pressure in "kilopascals".

Rim specifications

Rim specifications: Indicates the rim specifications used to match the tire. Convenient for practical use, such as "Standard Rim 5.00F".

Balance mark

Balance mark: Made of colored rubber in the shape of a mark, printed on the sidewall, indicating that the tire is the lightest here. When assembling, it should be facing the valve to ensure that the entire Tire balance.

Rolling direction

Rolling direction: The pattern on the tire is particularly critical for water drainage and anti-skid during driving, so off-road vehicle tires with asymmetrical patterns are often equipped with arrows to mark the rolling direction to ensure the design Adhesion, anti-slip and other properties. If installed incorrectly, it will be counterproductive.

Wear limit mark

Wear limit mark: Rubber strips and blocks are used on one side of the tire to mark the wear limit of the tire. Once the tire wear reaches this mark position, it should be replaced in time, otherwise it will cause damage. Not strong enough for a tire puncture midway.

Production batch number

Production batch number: A set of numbers and letters indicating the year, month and quantity of the tire. For example, "98N08B5820" means the 5820th tire produced by Group B in August 1998. The production batch number is used to identify the tire's condition and storage time.

Trademark

Trademark: A trademark is the logo of a tire manufacturer, including trademark text and patterns, which are generally prominent and eye-catching and easy to identify. Most of them are marked in conjunction with the name of the manufacturer.

Other marks

Other marks: such as product grade, production license number and other ancillary marks. It can be used as reference and information when choosing.

Tire markings are generally relatively standardized. Once they are clearly identified, you can purchase and use them with confidence.

The following is a common way to express tire specifications:

Example: 185/70R14c 86H

185: Tread width (mm)

70: Aspect ratio (tire height ÷ tire width) (70 refers to 70)

R: Radial structure

14: Steel rim diameter (inches)

c: Indicates a weighted tire

86: Load index (indicates the corresponding maximum load is 530 kg)

H: Speed ??code (indicates the maximum safe speed is 210 km/h)

Speed ??code maximum speed (km/h)

C: 60 D: 65 E: 70 F: 80 G: 90 J: 100 K: 110 L: 120 M: 130 N: 140 P: 150 Q: 160 R: 170 S: 180 T: 190 U: 200 H: 210 V: 240 W: 270 Y: 300

Load code limit

80: 450kg 81: 462kg 82: 475kg 83: 487kg 84: 500kg 85: 515kg 86: 530kg 87: 545kg 88: 560kg 89: 580kg 90: 600kg

Extended information:

Tires are ring-shaped elastic rubber products that roll on the ground and are assembled on various vehicles or machinery. Usually installed on a metal rim, it can support the body, buffer external impacts, achieve contact with the road and ensure the driving performance of the vehicle. Tires are often used under complex and harsh conditions. They are subject to various deformations, loads, forces, and high and low temperature effects when driving. Therefore, they must have high load-bearing performance, traction performance, and cushioning performance. At the same time, high wear resistance and flex resistance, as well as low rolling resistance and heat generation are also required. Half of the world's rubber consumption is used in tire production, which shows the tire's ability to consume rubber

Reference: Baidu Encyclopedia - Tires