Chariot Forged Wheels For Lotus

Analysis and comparison between the forged aluminum wheel and steel wheel :

steel wheel Forged aluminum rim Steel wheel rim Competitive results
1. Weight 24 kg 49kg Aluminum rim half-light
2. Materials 6061 high strength alloy aluminum steel plate The aluminum wheel rim has high comprehensive mechanical strength.
3. Manufacturing style It is formed by integral forging and spinning The spokes and rims are divided into stamping, rolling, and welding The welding point of the steel ring is the weak link
4. True roundness CNC lathe processing completed Steel plate curling and welding Poor rims
5. Dynamic equilibrium Density average Poor roundness, welding The aluminum wheel rim is stable at high speed
6. Premise of heat dissipation High-density bubble-free assimilation Heat conduction is not as good as aluminum alloy Aluminum rim delays tire service life by 26%
7. Impact Almost a trickle of damage The damage is serious The aluminum wheel rim is safe and reliable
8. Rigidity Not suitable for deformation Easy to deform Aluminum wheels prevent tires from eccentric wear
9. Pressure test 73000 kg deformation 5cm 13600kg deformation 5cm The strength of the aluminum rim is 5.37 times that of the steel ring
10. Appearance Bright and delicate Gray, coarse and dry
11. Cost 3-4 times higher than steel ring Low cost High cost of forging aluminum wheel rim

1. Lightweight

The weight of a forged aluminum wheel is only half of that of a steel wheel. Take 22.5×8.5 as an example: the weight of a forged aluminum wheel is 24 kg, and that of a steel wheel is at least 49 kg.

2. Fuel economy

Forged aluminum wheels are lighter in weight, which easily increases accelerating performance and decreases braking energy demand, and correspondingly saves fuel. In addition, due to the unique airflow and rolling resistance of the forged aluminum wheel, the fuel-saving rate of the 100 km test is at least 2 liters per 100 km (The fuel consumption of the former is 2.5 liters lower than that of the latter).

3. Tire wear is reduced by 26%

Because of the characteristics of the forged aluminum wheel, its equilibrium value is 0, it is not easy to deform, and it has fast temperature dispersion (the normal driving temperature is 20-30 degrees lower than that of the steel wheel). It has better protection for the suspension system, so the wear of the tire is greatly reduced, making each tire run 50000-80000 km more).

4. Can reduce the maintenance cost of the brake

Forging aluminum wheels are characteristic of quick heat dissipation, so can well protect the braking system and parts which are made of materials not quite resistant to high temperature, hence greatly reducing the maintenance cost of the brake system.

5. Higher loading capacity

The bearing capacity of the forging aluminum wheel is 5 times that of the ordinary steel wheel. The forged aluminum wheel only deforms 5cm after bearing 71200kg when the steel wheel has been deformed 5cm after bearing 13600kg. In other words, the strength of a forged aluminum wheel is five times higher than that of a steel wheel.

6. Improve driving comfort

Because of the characteristics of forged aluminum wheels, the driving experience after installation is lighter, and the high-speed driving is particularly smooth, so as to improve the driving pleasure.

7. Safe

For high-speed vehicles, it is not surprising that high-temperature tire burst and braking efficiency decrease due to tire friction and braking. The heat transfer coefficient of the aluminum wheel is three times that of steel. Because of the layout characteristics of aluminum wheels, it is easy to disperse the heat generated by tires and chassis in the air. Even in the environment of long-distance high-speed driving or continuous braking on a downhill road, the car can be connected to the appropriate temperature. It can not only make the drum of the tire and brake not easy to be aged due to high temperature but also reduce the tire burst rate.

8. Have a higher strength of resistance

When under the same impact of external force, forged aluminum wheels suffer far less damage than steel wheels.

9. Nice appearance

The forging aluminum wheel has a large degree of freedom in appearance design, which can connect the car with the wheel and make it perfect.

How to Judge the Wheel is Forged or Cast from the Appearance?

Forged wheels have a lot of advantages compared with cast wheels, so how to judge whether it is forged or cast from the appearance?

From the front: Generally, due to technical reasons (leave out 10000 words here), the draft angle of the cast wheel generally needs 7° to 10° and that of the forged wheel is generally 0° to 3°, so it can be judged intuitively as shown in the figure below.

From the back: cast wheel will certainly take out material from the back, one reason is to reduce the heavyweight, and the other is to facilitate engraving symbols. The forged wheel may not need to take out material.

From the sound: the wheel made of good aluminum is denser, so the echo of knocking is clearer. If the wheel is produced by liquid aluminum forging technology, the sound is the clearest, and the echo may last for several seconds. If you find that the echo is dull or almost no echo, it is better to give up.

From the hand feeling: the thickness of the forged rim is thinner than that of the cast rim, which is judged by hand feeling or weight.


Chariot Design, Lotus, Motorsports
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