To understand the rim, let's first understand the manufacturing process of the rim. The wheels we see now can be divided into iron wheels and aluminum alloy wheels. Since iron rims are already dying products, we will focus on aluminum alloy rims. The common manufacturing methods of aluminum alloy wheels can be divided into six categories: forging, molten soup forging, low pressure casting, molten soup casting, inclined casting and gravity casting. Forging is the strongest and lightest. Forging means that the whole aluminum ingot is extruded by a die with a weight exceeding1000t (the manufacturing pressure can reach 1.6× 1.07N/cm2, while the density of the casting is only 2.2 kg/cm3), which will make the overall density of the rim average, improve the material strength and reduce the weight. Take 15 inch aluminum alloy rim as an example. The weight of products produced by professional rim manufacturers can be controlled at 3.6~3.8 kg, which is more than half lighter than other manufacturing methods, but the manufacturing cost is 4~5 times higher than that of casting, and the price is amazing. As for low-pressure casting, it is a compromise. The manufacturing process is to melt aluminum and other metal alloys into liquid state at high temperature, and then inject them into the mold for molding. This can not only achieve the purpose of high strength and light weight, but also control the manufacturing cost. It is the mainstream manufacturing process of most modified rims at present.

When choosing the aluminum alloy rim to be replaced, we should not only choose the style we like, but also pay attention to the relationship between the shape of the aluminum ring and the heat dissipation efficiency. The shape of the rim determines the heat dissipation efficiency of the braking system, so it is very important to choose a reasonable rim shape. Here we help you analyze the relationship between some common rim types and heat dissipation in the market.

1. The traditional multi-claw type adopts the traditional thin five-claw or six-claw design, which is a classic eye-catching style. This design is very helpful for the heat dissipation efficiency of the brake system. As for some three-claw or four-claw rims, although they can help to dissipate heat, their torsional and impact resistance and strength are worrying because of too few supporting spokes and poor domestic road conditions.

2. The radial line type adopts multi-spoke or even tree-like design, which feels very moving, and its balanced and symmetrical hollowing interval is very helpful for heat dissipation.

3. Covering a number of large-area spokes, it has a luxurious and high-grade feeling, but it has no effect on the heat dissipation function, and some will have a heat gathering effect because of the shape.

After replacing the aluminum ring, everything is abnormal and needs to be checked before it can be used safely. First of all, it must be checked whether the wheel carrier will grind the parts of brake cylinder, vibration reduction or suspension system. In addition, it is necessary to increase the size of the rim, and the beads should not protrude from the front fender to avoid the friction between the tire and the fender when driving or turning, damage the tire, and even cause dangerous accidents such as puncture. Secondly, after a period of exercise, it is necessary to regularly check whether the balance lead block and nut are loose or fall off. In addition, whether the tire wall has abnormal expansion is usually caused by the violent impact here and the fracture of the tire wall steel wire. Of course, the roundness of the rim at this position will also be affected. This is a direct method to check whether the rim is deformed. If there is a crack in the rim, even if it is repaired, the strength will be greatly reduced. As long as it collides again, it will break again at any time, so it is better to replace it for driving safety.