Kiến Thức Về Lốp Xe

When replacing car tires, users are usually only interested in tire sizes, manufacturers, and costs, but are less interested in the specifications that are suitable for their needs. Therefore, there have been many problems related to tires such as tire explosion when running at high speed, tires are too noisy, prone to "slash" ...

Here are the tire parameters that users need to pay attention to when buying.

Find service description characteristics

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Not all tires are available, and if so, this sign is usually before and after the size name, be it P, LT, ST, T or C.

P: Passenger vehicle

LT: light truck tire (Light Truck)
ST: Special tractor tires (Special Trailer)
T: Temporary replacement tire (Temporary)
C: Commercial truck tires, heavy trucks

Understand tire structure

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Most of this parameter is displayed in the letter R and right after the tire profile. R means radial structure, radial, an industry standard for cars, and the most popular tire. Other vehicles can be B, D or E.


Diameter of wheels (rim, la zang)

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Measured in inches (1 inch = 25.4 mm); For example, P225 / 45R 17 91V tires will be attached to wheels with a 17-inch diameter. Some common diameter wheels are 8, 10, 12, 13, 14, 15, 17, 18, 19, 20, 22, 23, 24, 26 and 28 (units are inches). These are all popular wheels for sedan, SUV, minivan, van and light truck.


Tire width and profile

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It is a series of alphanumeric characters immediately after the service characteristics and a slash in between. The first three numbers are tire width and in millimeters. The width can range from 155 to 315. The example in the image is 225 mm.

The next two numbers and behind the slash are the tire profile, which is the percentage between the height of the tire against the width of the tire and usually between 55 and 75% for most cars. The example in the picture is 65%.
Tire profile is calculated: 205 mm x 65% = 133.3 mm.

Find the maximum allowable load index

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This number is particularly important, indicating that the greater the load capacity of the tires and the larger the number, the higher the tire load. This sign is not always a number.

Never replace the original tire with a lower permissible maximum load, but only with the same tire, or higher. For example, use the type as shown in image 82, when replacing it must be the same type 82 or higher.

Find the maximum speed index allowed

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The index indicates that tires can load a certain amount of cargo and run at a certain speed. The letters indicate the speed limit of each tire as follows:

P: 150 km / h (as in the picture)

Q: 160 km / h

S: 180 km / h

T: 190 km / h

U: 200 km / h

H: 210 km / h
V: 240 km / h

Z: over 240 km / h

Heat resistance index

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Indicates the high-speed heat resistance on the inside of the tire. This index may be A, B or C with A showing the highest heat resistance and C being the lowest.


Tire pressure indicator

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Located on the lower rim of the tire, the maximum load index, the pressure indicator is suitable to maximize tire performance.


Safety edge - tire wear

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Need to change the tire when you see that the tread wears to the edge in the groove or the tire has many large cracks, irregular sides.

Everyone knows the use of worn-out tires is especially dangerous. When the tire layer wears to the edge in the groove, it is time to change the tire. Using bare tires is not only easy to explode but also increases the risk of traction when rain.

Tire expiry date

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Tires also have their own expired date, so you should pay attention to this section to avoid buying car tires and then store them in unused storage, although outside it looks like the tire has no problems, But in fact, when the expiry date is over, the tire will lose all its inherent features.

It is possible to check the tire's expiry index thanks to the last 4 digits printed on the tire wall, for example, if the tire has the last 4 digits of 1418, it means that the tire is manufactured in the 14th week of 2018.