EPS format, Bridgestone, Bridgestone, tire brand, logo, vector logo.

1, ISO mark:

ISO symbol is the abbreviation of International Organization for Standardization. There are ISO9000, ISO9002 and so on. According to the ISO mark, the specifications of tires must be expressed in the following way. For example, the significance of data set 2 15/80R 16 82H:

2 15: indicates the tire width (215 mm); );

80: stands for flatness ratio (the ratio of tire sidewall height to tire width, expressed as a percentage, omitting%). That is, 80 means 80%);

R: indicates that the tire has a radial structure (R indicates a radial structure);

16: indicates that the nominal inner diameter (or hub diameter) of the tire is 16 inch;

82: Indicates the load level, that is, the maximum load index that can be sustained. Generally, according to the tire manufacturers' own regulations, different manufacturers have different regulations. The following appendices give approximate load levels and corresponding load tables;

H: indicates the speed level (corresponding to the safe maximum speed, where H indicates that the maximum speed is 2 10km/h/h ... See below for the speed indicated by other symbols).

2, the American mark, also known as P system:

The methods of expression are small and different. Example:1:p215/80r1682h, which is different from the ISO logo in that a letter P is added, which stands for bus abbreviation, and the others are the same as the ISO logo. Example 2: P2 15/80 H R 16, the symbols and numbers have the same meaning. But observing the difference from the first example, it is found that H is put together with R, which represents the meridian structure, and the load level is missing. In fact, this load level will be marked elsewhere in the tire. You can look for it. Example 1 and example 2 represent a tire of one specification (if both are 82 load levels).

3. European symbol:

The European symbol refers to the domestic and mutual trade standards of Britain, France, Germany, Italy, Switzerland, Romania, Poland, Spain, Portugal, Denmark, Belgium, Ireland, the Netherlands and the Czech Republic. This standard is represented by e, that is, if there is no "e" sign between them, their products are not allowed to be sold. The specifications of the tire are shown in the following example.

Example1:185/r1490s. The difference with ISO mark is that there is no flattening rate, and everything else is the same (for example, 185 indicates tire width; R stands for meridian structure; 14 represents the nominal inner diameter of the tire; 90 denotes the load level; S stands for speed level).

Example 2: 185/70R 14. The difference from the ISO logo is that there is no load level and speed level, and everything else is the same.

Example 3: 165/R 13 86S. The difference from ISO mark is that there is no flatness ratio, and everything else is the same.

It is worth noting that there is no flatness in Example 1 and Example 3. In fact, the flat rate in this tire size label is 80, which is just omitted. Therefore, the tires of 185/R 14 and 185/80R 14 are completely interchangeable, which can bring a lot of convenience.

Appendix 1:

Correspondence table between speed level and maximum speed:

Code: speed grade symbol: M N P Q R S T U H V W Y

Maximum speed (km/h):? ? 130 140 150 160 170 180 190 200 2 10 240 270 300

Appendix II: Table of Load Level and Load Correspondence:

Code: load level: 75 76 77 78 79 808182 83 84 85 86 87 88 89 90?

Load (kg):? ? 387400 4 124254374504624754875005 15530545560580600?

Load level: 9192 93 94 95 96 97 98 99100.

Load (kg): 615630 650 670 690 710 730 750 775 800

The upgrade of tires is also very knowledgeable. A good upgrade scheme will greatly improve the driving performance of vehicles, and a wrong upgrade will even affect driving safety. ? Benefits of tire upgrading: When upgrading tires, generally choose tires with better quality, higher speed, wider tread and larger diameter.

So what are the benefits of tire upgrading?

(1) improves the high-speed performance of vehicles. Many people take improving the speed level of tires as the purpose of tire upgrading. High-speed tires have good high-speed performance. When driving at high speed, the tread temperature rises slowly, which makes the tire pressure change little and reduces the possibility of tire puncture.

(2) The safety performance has been improved. When upgrading tires, using wide tires is also an option. Appropriately increasing the tread width will increase the adhesion between the tire and the ground, and the vehicle will not slip easily when starting and braking. Moreover, the tire with wider tread has better directional stability when braking, and the braking distance will be slightly shortened.

(3) The combination of more fashionable flat tires and avant-garde rims will make the appearance of the vehicle more fashionable.

Classification of tire upgrading

At present, there is confusion in some tire modification markets. Car owners blindly pursue fashion, and modified shops blindly pursue profits. In addition, many employees do not have the knowledge of tire modification, and it is inevitable that there will be irregular modification.

Tire upgrade can be divided into two types, quality upgrade and specification upgrade.

(1) The quality upgrade uses the same tires as the original matching tyre size, but uses higher-grade tires, such as tires with higher speed grades or tires with higher ply grades. By improving the quality, more beautiful tread patterns, better drainage performance, less rolling noise or better driving stability can be obtained.

(2) Specification upgrade: within the scope permitted by the chassis structure, upgrade the tyre size, that is, increase the tire diameter or widen the tire tread. The purpose of doing this is not only to improve the driving stability of tires, but also to make the appearance of vehicles after replacing tires more fashionable, and tires are usually upgraded in quality as well as specifications. The upgrade of tire size is usually accompanied by the upgrade of rim, and the cost is often high.

Matters needing attention in tire upgrading

Many people have a wrong understanding of tire upgrading, thinking that tire upgrading is to replace the original tire with a tire with a larger diameter and a wider tread. Actually, it's not. Tire upgrading is also very knowledgeable. A good upgrade scheme will greatly improve the driving performance of vehicles, and a wrong upgrade will even affect driving safety.

(1) First of all, it is necessary to clarify the purpose of tire upgrading, whether it is to improve the quality of tires or to enhance the fashion of appearance, which is the decisive factor in choosing the tire upgrading method.

(2) To consider the main purpose of the vehicle, that is, the purpose of the tire. If the vehicle is used every day, the wear resistance of tires may be the most important consideration. Sports wide tires have good ground adhesion, but wear quickly. At the same time, in order to pursue speed, the tread pattern will be reduced as much as possible, so the performance of tires on wetlands will not be ideal. If vehicles are often used in rainy and humid areas, then a set of wetland tires with good adhesion to wetlands should be a good choice.

(3) Recognize the possible problems caused by tire upgrading. Tires with large tread width can certainly improve the driving stability of vehicles, but the wider the tires, the better. The friction between wide tires and the ground is greater, which is followed by the problem of rising fuel consumption, and after the tread is widened, the heavy feeling when turning will also increase. When the height-width ratio of the tire decreases, the sidewall of the tire will become thinner and the comfort will be lost to a certain extent. Moreover, this kind of tire is difficult to manufacture and the price will go up. Therefore, the appropriate tire upgrade should be to improve the performance while minimizing some negative effects brought by tire upgrade.