There are one-piece, two-piece and three-piece aluminum wheels. The two-piece aluminum hub is welded or nailed on by an inner part and an outer part. Be careful when welding, because welding two things does not necessarily guarantee roundness.

The three-piece aluminum hub is composed of a central part and two outer round parts, which are screwed together with aviation-grade screws. In order to reduce the quality, many three-piece aluminum wheels use forged parts. The three-piece structure provides manufacturers with greater flexibility for small-batch manufacturing.
Safety

For high-speed cars, it is not uncommon for high-temperature tire bursts and reduced braking efficiency due to wheel deformation and braking to occur. The thermal conductivity coefficient of aluminum alloy is three times larger than that of steel and iron, and the heat dissipation effect is naturally much better, thereby enhancing the braking efficiency, increasing the service life of tires and brake discs, and effectively ensuring the safe driving of the car.
Comfortable

Cars equipped with aluminum alloy wheels generally use radial tires. The cushioning and shock absorption performance of radial tires is better than that of ordinary tires. In this way, the comfort of the car will be greatly improved when driving on uneven roads or at high speeds.
Energy saving

Due to the light weight of aluminum alloy wheels (about 2kg difference from aluminum or steel wheels of the same specification) and high manufacturing accuracy, the deformation and inertial resistance are also small during high-speed rotation. This is conducive to improving the straight-line driving performance of the car and reducing the rolling resistance of the tires, thereby reducing fuel consumption.