The importance of car tires to vehicles is self-evident. The tire is the foot of the car and the only place where the entire car touches the ground. The quality of the tire directly determines the possibility of safe driving.

Most people think that the tire is just the black rubber part. In fact, it is an integral part of the aluminum alloy wheel. Without the support of the aluminum alloy wheel, the best rubber product is useless. Therefore, it is not allowed to change the aluminum alloy in the modified car The wheels are big and small, today I will share with you the knowledge of aluminum alloy wheels:

Aluminum alloy wheels: also called rims, steel rims, wheels, and tire bells. Aluminum alloy wheels are the rotating part of the wheel core connected by the inner wheel steel of the tire through the column, that is, the metal component that supports the center of the tire and is mounted on the shaft.

There are many types of aluminum alloy wheels according to the diameter, width, forming method, and material. At present, it has developed to the third generation:

The first generation is composed of double row angular contact bearings.
The second generation has a flange for fixing the bearing on the outer raceway, and the bearing can be simply sleeved on the axle and fixed with a nut.
The third-generation aluminum alloy wheel hub bearing unit uses the bearing unit to cooperate with the anti-lock brake system.

The meaning of the main parameters of aluminum alloy wheels

Aluminum alloy wheel size: In fact, it is the diameter of the aluminum alloy wheel. The 15-inch aluminum alloy wheel and 16-inch aluminum alloy wheel that people often say are the size (diameter) of the aluminum alloy wheel.

Generally on a car, the aluminum alloy wheel has a large size and a high tire aspect ratio, which can have a good visual tension effect, and the stability of the vehicle handling will also increase, but the fuel consumption will also increase with the size. Increase and increase.

Aluminum alloy wheel width: Also commonly known as the J value, the width of the aluminum alloy wheel directly affects the choice of tires. For tires of the same size, with different J values, the selected tire aspect ratio and width are also different.

PCD and hole position: The professional name of PCD is pitch circle diameter, which refers to the diameter between the fixing bolts in the center of the aluminum alloy wheel hub. Generally, the large hole position of the aluminum alloy wheel hub is 5 bolts and 4 bolts, but the distance between the bolts is also Each is different

We can often hear the names 4X103, 5X114.3, and 5X112. Taking 5X114.3 as an example, it means that the PCD of this aluminum alloy wheel is 114.3mm, and the holes are 5 bolts.

When choosing aluminum alloy wheels, PCD is one of the most important parameters. For safety and stability considerations, it is best to choose aluminum alloy wheels with PCD consistent with the original car for upgrading.

Offset (Offset or ET): It is the distance between the mounting surface and the center line of the aluminum alloy wheel. This parameter can usually be found on the back of the aluminum alloy wheel; in layman's terms, the aluminum alloy wheel is retracted inward or outward after modification Protruding, the ET value is positive for ordinary cars and negative for a few vehicles and some jeeps.

Center hole: It is the part used for fixed connection with the vehicle, which is the position where the center of the aluminum alloy wheel is concentric with the aluminum alloy wheel. The diameter size here affects whether we can install the aluminum alloy wheel to ensure that the geometric center of the rim can be matched with the aluminum alloy wheel. The geometric center coincides (although the aluminum alloy wheel positioner can change the hole distance, but this kind of modification is risky, netizens should use it with caution).

There are three manufacturing methods for aluminum alloy wheels: gravity casting, forging, and low pressure precision casting.

Gravity casting method: It uses gravity to pour the aluminum alloy solution into the mold, and after cooling and forming, it can be polished by a lathe; this manufacturing process is simple, low cost, high production efficiency and does not require precision casting technology, but it is easy to produce bubbles (Bladder), uneven density, insufficient surface smoothness, etc.
Forging method: The whole aluminum ingot is directly extruded on the mold by a thousand-ton press. The advantages are uniform density, smooth and detailed surface, thin aluminum alloy wheel wall, light weight, high material strength, etc., but due to the need for more sophisticated production Equipment, and the yield rate is only 50 to 60%, and the manufacturing cost is relatively high.
Low-pressure precision casting method: precision casting at a low pressure of 0.1Mpa. This casting method has good formability, clear outline, uniform density, and smooth surface. It can achieve high strength, light weight, and cost control, and the yield is low. More than 90% is the mainstream manufacturing method for high-quality aluminum alloy wheels.

Precautions for daily use:

1. When the car is driving the aluminum alloy wheel for a long time at a high temperature, it should be cleaned after it has cooled, otherwise the aluminum alloy wheel will be damaged, and the brake disc will be deformed seriously and affect the braking effect. It will also cause a chemical reaction on the surface of the aluminum alloy wheel, which will lose its luster and affect the appearance.

2. When the aluminum alloy wheel is stained with oil that is difficult to remove, I recommend a product (iron powder remover) that is more effective in removing the stain.

3. When the vehicle is parked in a humid place for a long time, the aluminum alloy wheels should be cleaned frequently to avoid corrosion of the aluminum surface by salt.

4. After cleaning if necessary, the aluminum alloy wheels can be waxed and maintained to keep their luster forever.

5. When driving by the side of the road, try to pay attention to the curbs to avoid permanent scratches on the aluminum alloy wheels. Normally, the aluminum alloy wheels of our family cars are often injured like this.