The number on the tire can be described as numerous, in addition to the tire size we frequently mentioned, we also learn much about it. For example, the maximum inflation pressure, the upper limit load, and even how much the tire wear is replaced can be included in these labels. turn up. Below we use the following figure to understand what other labels mean:
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From the above map, we can intuitively understand the brand of the tire, wear resistance, wetland grip, cooling capacity, origin, tire type, wear bottom line indicators, production date, maximum inflation pressure, maximum load, specifications Size, upper limit speed, etc.
DOT
DOT means that the tire meets the Department of Transportation tire safety standards and is approved for highway use. The first two letters after the DOT indicate the tire manufacturer and factory code, the third and fourth characters indicate the tire size, the fifth, sixth, seventh, and eighth (optional) characters indicate the tire's brand and other Significant characteristics. The ninth and tenth characters indicate the number of weeks of tire production. The last digit indicates the year of production of the tire. The new ETRTO standard tire has been changed to a four-digit DOT code, and the last two codes represent the year. For example: DOT M5H3 459X 2800 is a tire produced in the 28th week of 2000 AD.
ECE
The European Economic Commission of ECE (Economic Commission for Europe) requires that all vehicles and dual-use vehicles produced in member countries from October 1, 1977 must use "qualified tires" (ECE cannot be confused with "Common Market" or EEC, ECE Including all EEC countries plus other countries, qualified tires indicate compliance with a number of standards concerning many components that affect safety, including tires. Each tire and design has its own unique number. The prefix is added by E plus A figure that indicates the country in which the design was registered (eg E1 for Germany, E2 for France, E11 for UK, etc.). For example, for the 165/80R13 MXT 80, the number for this group is (E2) 0288529, which is designed in France and can be identified from the tire approval number as 165/80R13 MXT 80. Not all tires have been approved by the ECE. In order to comply with the ECE standards, the tires must be approved by the laboratory, meet the validation test requirements, and their manufacturers have passed inspections.
UTQG
UTQG (Uniform Tire Quality Grade) means "consistent tire quality grade", which is regulated by the United States Government Department of Transportation (DOT) National Highway Traffic Safety Administration (NHTSA), but some countries such as Canada also follow the same standards. It consists of three levels and is tested under the conditions prescribed by U.S. government regulations. The three levels are:
Wear index
This is a number that represents the difference in tread life versus standard class 100 tires. Tread wear levels typically range from 60 to 500, with 20 points increments. However, the actual life of any tire is determined by the quality of the road surface, driving habits, inflation pressure, vehicle condition, and the condition of tire storage and experience.
In order to understand the wear resistance of the tread pattern, the tire can be tested under the control conditions of the specified test process, and it is not necessary to simulate the actual application of the tire to be used. Therefore, after testing these test parameters, it is still impossible to express the actually worn mileage as the tread wear index.
In the United States, the tread wear level is determined by a 400-mile legal test road, which includes the general road section near San Angelo, Texas. Each time no more than four test vehicles are grouped under the escort, they pass the prescribed road, so all the tires go through the same conditions. Tire tread depth is measured every 800 miles. Each control factor or road test tire follows the same procedure. After the 7200-mile test is completed, the test results are compared and the manufacturer specifies the tread wear level. Tested tires.
Tracking level
The tracking level is to measure the ability of a given tire to stop a straight ahead vehicle on a wet test road, but does not measure linear acceleration. The tracking level test will only slide straight ahead on concrete or asphalt roads with a certain degree of slip (simulating most of the road in a rainy day), and the grades obtained from these tests do not represent dry trackability, corner tracking. Or drainage. The tracking levels are classified into A, B, and C levels. A is the highest level.
The tracking level test is conducted on a government-maintained wet road surface. The standard tire is measured on asphalt and concrete roads twenty times and an average value is obtained. The value is used as a benchmark to compare the results of the tire under test. After the comparison of the results was completed, the test tires were awarded with the tracking grade against the government-specified comparison coefficient.
Temperature rating
Temperature rating is also divided into three levels, A is the highest level. The temperature rating represents the ability of the tire to maintain proper heat dissipation under controlled indoor test conditions. The temperature rating test is to run the tires at high speeds under specified conditions and run continuously for 30 minutes at a distance of 5 miles from 75 miles until the tire ruptures. If the tire meets the minimum performance required by the DOT, it is classified as "C" grade, and the "B" and "A" grades represent a higher performance level than the DOT's minimum requirement.
