Most of today's cars use aluminum alloy wheels, but many of the low configuration models below 100000 still use iron wheels, and the low configuration models of more expensive cars no longer use iron wheels.

　　Aluminum alloy wheel hub. The disadvantage is that the price is expensive. The edge is broken and cannot be repaired. There are many advantages. First of all, it has good appearance. It can be made into various styles with good visual effect. It's mainly about face. Aluminum alloy wheels are generally medium and high-end cars. When you see iron wheels, you must buy low-end cars. Secondly, it has real advantages. Because the density of aluminum is smaller than that of iron, and because of the shape, the weight of aluminum alloy hub is lighter than that of iron hub, about one or two kilograms. Because of its light weight, it brings the following benefits.

　　Today's cars are pursuing lightweight. The fact that the hub is lighter actually reduces the unsprung mass. The unsprung mass can be simply understood as the mass of the parts below the suspension that can jump with the wheels. As the saying goes, one kilogram under the spring and ten kilogram above the spring means that reducing one kilogram under the spring is equivalent to reducing ten kilogram on the spring. In fact, reducing the weight under the spring is not an easy thing. Replacing the iron wheel hub with the aluminum alloy wheel hub is the simplest way to save trouble.

　　Then, the fuel consumption of aluminum alloy wheel hub will also be reduced, or because it becomes lighter. Just as we run with 2 kg shoes and 1 kg shoes, the strength used must be different. Of course, the improvement of all kinds of performance may not be felt in normal driving, but the improvement of automobile performance is accumulated bit by bit. Even if the manufacturer improves the performance, it will be improved bit by bit, and it is impossible to suddenly improve a large level. Therefore, if the economic conditions permit, if the original car is an iron wheel hub, it can be replaced with an aluminum alloy wheel hub for a little money, and there are still many advantages.