There are more than 10 kinds of marks on the car tires. Many netizens only understand the simple marks such as brand and tire size values. The other marks must not be printed because of their beauty. It is very important to correctly identify these marks for the selection, use, and maintenance of the tires. It is of great significance for ensuring the safety of driving and prolonging the service life of tires. Let's take a look at the meaning of these numbers and letters. .
The following figure shows the position and function of all indicators on the tire:
Tire specification mark analysis
The most common signs on tires are the tire brands first, followed by the tire specifications, followed by the load index and speed indicator. A simple example is 205/55R1691V. The first value 205 represents the tire width in millimeters (mm), 55 represents the flatness ratio (percentage of the sidewall thickness and the width of the tire), R16 represents the hub diameter, and 91 represents The load factor, V represents the speed factor, and the load factor and speed factor have special tables that can be used to find out the corresponding maximum load and maximum safety speed.
Speed ​​grade is the maximum speed limit given by many factors considerations and tests in tire design and production. Once the speed exceeds this value, it will bring a variety of safety hazards. In general, all-terrain tires (AT) consider non-paving The driving performance of the road surface makes the speed level lower than road type tires.
There are more than 10 kinds of marks on the car tires. Many netizens only understand the simple marks such as brand and tire size values. The other marks must not be printed because of their beauty. It is very important to correctly identify these marks for the selection, use, and maintenance of the tires. It is of great significance for ensuring the safety of driving and prolonging the service life of tires. Let's take a look at the meaning of these numbers and letters. .
The following figure shows the position and function of all indicators on the tire:
Tire specification mark analysis
The most common signs on tires are the tire brands first, followed by the tire specifications, followed by the load index and speed indicator. A simple example is 205/55R1691V. The first value 205 represents the tire width in millimeters (mm), 55 represents the flatness ratio (percentage of the sidewall thickness and the width of the tire), R16 represents the hub diameter, and 91 represents The load factor, V represents the speed factor, and the load factor and speed factor have special tables that can be used to find out the corresponding maximum load and maximum safety speed.
Speed ​​grade is the maximum speed limit given by many factors considerations and tests in tire design and production. Once the speed exceeds this value, it will bring a variety of safety hazards. In general, all-terrain tires (AT) consider non-paving The driving performance of the road surface makes the speed level lower than road type tires.
Unknown three "T" index
The so-called three "T" is that we often see the Treadwear (Traction Performance) Temperature (Temperature Index) of these three types of logo. These three kinds of signs are civil tires. In addition to the conventional parameters such as size, speed grade, load level, etc., we can also choose the tire's three “T†index. This is also the three major indexes that are not well known to the consumers.
These three indices are from the National Highway Safety Administration NHTSA's Uniform Tire Quality Rating Standard (UTQG). All indices are based on standardized tests, although these indices may not be referenced for practical applications. Value, but because the standard is unified, it can be used when horizontally comparing tires, which is also a good helper when choosing tyres.
Traction (traction performance) This parameter is actually a more straightforward understanding of the level of grip, marked by AA/A/B/C, AA represents excellent, C is the worst, but it should be noted that the consideration of this parameter has limitation. Since this rating tests the skid resistance of a tire on a slippery road, it seems to be more of a pattern of drainage design and tread formulation. It does not explain the lateral grip of this wide tire in a curve. As you can imagine, hot-melt tires with the strongest dry grip under such test conditions will never be able to get the highest AA rating. It is also worth noting that the "AA" rating was added after 1997, which replaced "A" as the highest rating. You cannot find the "AA" logo in any case before this.
The temperature index is also expressed in terms of A/B/C, which is the tire's resistance to high temperatures. We all know that the tire temperature rises when the vehicle is driving at high speeds or during intense driving. At this time, the tire pressure and the rubber properties of the tire are increased. It will also change with it. Selecting tires with index A is naturally the best policy
The wear resistance index of Treadwear is represented by numbers. The level of the number represents the mileage of the tire under the same use environment. The larger the number, the better the wearability of the tire. This value is achieved under uniform test conditions. According to the function of the tire wear, the mileage of the tire can be estimated based on the function ---- so this is not the actual mileage measured by the tire wear to the tire change block.
An index of 100 means that the tire can be used for 29,808 miles, or about 48,000 kilometers, in the test, and if the value is 200, it is equal to twice the 100, ie 59,616 miles, about 96,000 kilometers, and so on. This involves a problem that can not be shared by both fish and bear's paw. Usually, the tire wear index with excellent grip performance is relatively low, which is why the wear index of high-performance tires is usually below 200, and is generally above 300. Although the tires are wear-resistant, the grip performance may not be ideal. Of course, with the continuous advancement of technology, some tires can have good abrasion resistance (200 or even 300 or more) while having good grip performance.
Edit summary:
Tyres are one of the most important parts of all vehicle components. Tyres are concerned with driving safety, comfortable driving, and whether to save fuel and many other factors. Therefore, we must be familiar with the parameters represented by each mark on the tire, so that we can better select a good tire that is suitable for ourselves and at the same time avoid accidents due to tires.
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