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2025
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Truck Encyclopedia (17) What secrets are hidden on the tires
As the "shoe" of the truck, the tire is inseparable from driving safety, but do you know what the English and numbers on it mean? In this issue, let's analyze the more common 295/80R22.5 tires on the market, and see what is written on its "clothes"?
轮胎型号部分
In fact, the more common tire models on the market can be roughly divided into two types: imperial units of measurement and metric units of measurement, for example, 295 of 295/80R22.5 tires is the metric unit of measurement expressed in mm (mm).
Another 12/R22.5 tire is an imperial unit of measurement, i.e. 12 equals 12 inches to convert to metric units of 305mm (mm).
1. Tire width
295 is the widest part of the tire section
The distance between the left and right tire walls is
295mm
The higher the number, the better
The larger the contact area of the tire with the ground
2. Aspect ratio
The second place 80 is the tire aspect ratio
Flat ratio
The ratio of tire width to rim-to-tread height
The aspect ratio is high
The tires have good shock absorption but poor handling
Low aspect ratio
Although the handling is good, the shock absorption is reduced
For example, the tire width is 295mm
Its aspect ratio is 80%
3. Radial tires
The full name of R in English is RADIAL
Chinese is radial tire
Radial tires are currently the mainstream configuration
Compared to bias tires
Radial tires are more wear-resistant and fuel-efficient
Better load and heat dissipation
Bias tires are generally indicated by a minus sign
7.00-16
is a good example
4. Rim diameter
22.5 corresponds to the specific value of the rim diameter in inches。
Tire numbers section
1. Tire load index
Comparison table of tire load index
152/149 is the tire load index
The corresponding "tire load mass table" can be obtained
295/80R22.5 tires
At 9 bar standard air pressure
When using a single tire
The maximum load on the tires is 3550 kg
When twins are used
The maximum load per tire is 3250 kg
2. Tire production date
4419 corresponds to the tire production date
The first two digits of 44 represent the number of weeks of tire production
The last two digits, 19, are tire production years
Finally, it is concluded that the tire production time is
Week 44 of 2019
Note: Tires also have a lifespan, card friends must pay attention to the tire production date when buying a car, and beware of buying old tires.
3. Tire level
18PR stands for tire tier
18 is the number of layers of tire cord
PR is the English abbreviation of hierarchy
The level can be understood as the tire skeleton
The higher the number, the higher the tire strength
4. Specific tire model
S100HFE is the "name" of the tire
If you want to buy the same tires later
Just in its brand
Look for that model
Tire English part
1. Tire speed level
The simpler letter M
Represents the maximum design speed of the tire
In the "Tire Grade Comparison Table"
M corresponds to 130 km/h
There is a corresponding comparison table for reference regarding the speed letter, and cardholders may wish to take a look at the maximum speed that their car tires can withstand.
2. Tire certification standards
DOT E13 is the certification standard on tires
DOT stands for passing
U.S. Department of Transportation certified
E13 represents adoption
EU regulatory certification
3. Tubeless tire logo
Tires with TUBELESS are tubeless
The letter identification TUBE is a regular tire
4. Adapt to working conditions and install axles accordingly
Two paragraphs in English
Tires are suitable for working conditions and axles
The EXPRESSWAY above is in Chinese
Meet high-speed working conditions
The following is expressed in English
This tire is suitable for steering shafts/load shafts
There are a lot of tire secrets, remember the key points throughout the article!
Seeing this, I believe that all card friends have basically understood the meaning of each number and letter on the tire, as long as you keep these points in mind when changing tires in daily use or later, you can avoid being deceived by some unscrupulous vendors.
And everyone should also abide by the tire usage conditions and installation position in daily use, so that it can achieve twice the result with half the effort, so that we can walk more safely in the north and south of the motherland.
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