【The owner's family car knowledge】No matter how powerful an engine it is, no matter how perfect a gearbox it matches, for a car, the key configuration to achieve its performance is the tires. Just as professional track and field athletes care about what kind of running shoes they use, suitable tires are essential to cars, speed is reflected by it, and stability is achieved by it. A large part of the off-road performance or cornering performance pursued by a sports car needs to be given by the tires.
However, it is difficult to detect whether the tire performance is excellent before buying a car. Manufacturers often do not use more perfect tires because of the need to control the cost of the entire vehicle. They will take the comfort, handling and economy of the vehicle into full consideration. Considering that the selected tires for loading, all aspects of performance are justifiable, but they are not the best. Shoes can be divided into dress shoes, casual shoes and sports shoes. In fact, the same is true for tires. Even tires of the same brand will have different characteristics due to different formulas, patterns and structures, and have different scope of application.
Tire basics
The size of the tire is indicated by a set of numbers and letters, which are printed on the side of the tire. The first n
【The owner's family car knowledge】No matter how powerful an engine it is, no matter how perfect a gearbox it matches, for a car, the key configuration to achieve its performance is the tires. Just as professional track and field athletes care about what kind of running shoes they use, suitable tires are essential to cars, speed is reflected by it, and stability is achieved by it. A large part of the off-road performance or cornering performance pursued by a sports car needs to be given by the tires.
However, it is difficult to detect whether the tire performance is excellent before buying a car. Manufacturers often do not use more perfect tires because of the need to control the cost of the entire vehicle. They will take the comfort, handling and economy of the vehicle into full consideration. Considering that the selected tires for loading, all aspects of performance are justifiable, but they are not the best. Shoes can be divided into dress shoes, casual shoes and sports shoes. In fact, the same is true for tires. Even tires of the same brand will have different characteristics due to different formulas, patterns and structures, and have different scope of application.
Tire basics
The size of the tire is indicated by a set of numbers and letters, which are printed on the side of the tire. The first number represents the cross-sectional width of the tire; the second number represents the aspect ratio; the third is a letter, which represents the tire structure, and the next number refers to the rim diameter; the last number and a letter represent the load factor and Speed level. For example: 175/65R15 86H, which means the tire width is 175 mm, the flatness ratio is 65, and the rim diameter is 15 inches. The letter or symbol in the middle of the flat ratio and the rim, the most common is "R", which is the same as "Z", which means radial tire; other, "X" is high-pressure tire; "one" is low-pressure tire; "B" Represents bias tires.
One of the important factors for comfort and stability: tire width
For the current common models, the tire section width continues from 165 mm to 225 mm. The wider the tire section, the better the stability and comfort of the car, but it also brings power consumption and fuel consumption increase. Therefore, the width of the standard tires of any car is determined according to factors such as the power, quality, dimensions and price of the car. It is not that the wide tires have an absolute advantage. The blind pursuit of wide tires not only increases the purchase cost, but also affects fuel consumption and acceleration performance. The gain is not worth the loss.
One of the important factors of handling: the aspect ratio of the tire
Aspect ratio refers to the ratio of tire section width (W) to tire section height (H). Common ratios are 65, 60, and 55. The larger the ratio, the higher the section height of the tire, which is commonly known as the thicker the tire, and vice versa. This value represents the handling performance of the tire. When the driving vehicle needs to turn, the steering action of the driver is transmitted to the rim of the front wheel through the steering wheel, and the rim drives the wheel to realize the steering. There is a hard connection between the steering wheel and the rim. Between the metal rim and the ground of the rubber tire, there is a soft and inflated rubber body. There is a time difference. The thicker the inflation layer of the tire, the greater the time difference.
Therefore, out of the demand for agile handling, the inflatable layer should be made as thin as possible, that is, the flatness ratio is very small, generally 45, 40, and 35. Tires with small flatness ratios are slightly less comfortable, but the handling effect is first-rate at high speeds. Comfortable cars generally use 60 and 65 tires. Sports car tires have a particularly small aspect ratio. Sports-themed cars often use low aspect ratio tires. For example, Audi A4L, one of which uses 40 tires.
Flattening ratio (%) = H/W x 100
Tires are also speed limited: speed class
The speed class refers to the highest speed that the tire can reach under the specified load and pressure standards. The common models on the market are mostly H and V, and some excellent performance cars use W and Y. However, as long as you are not on the track and approach or reach this speed, you are not only irresponsible to yourself, but also right. Threats to the safety of others. Seriously discouraged.
An indicator that most people don’t pay much attention to: tire load index
The load index refers to the maximum load capacity of a tire under specified conditions. For small passenger cars, this number is not very important in most cases, especially for sedan cars, there is not so much room for overloading.
