Aluminum rings, of course. The characteristic that aluminum ring is softer than steel ring determines that the comfort of aluminum ring is better than steel ring, and the heat dissipation of aluminum ring is about three times that of steel ring, so that the tire system is always at a more comfortable temperature, which will prolong the service life of tire; Aluminum rings of the same size are lighter than steel rings, and the most intuitive benefit is to reduce fuel consumption. Disadvantages of aluminum ring: once scratched, it is difficult to repair! Not good-looking! Just change the hub cover for the steel ring directly! If the rim was a good supercar, it would have been used long ago!

1769, a Frenchman, N·J· Juno, built a three-wheeled car driven by steam generated by gas combustion. However, the speed of this kind of car is only 4 kilometers per hour, and it is very troublesome to stop and add coal to the boiler every 15 minutes. Later, the car crashed into a brick wall during a trip and was smashed to pieces. Engineer karl benz successfully tested a two-stroke experimental engine for the first time. 1June, 883, founded "Ben Ci Company and Rheinland Gas Engine Factory". 1in June, 885, he manufactured the first Ben Ci patented motor vehicle in Mannheim, which was a three-wheeled vehicle with a two-stroke single-cylinder gasoline engine of 0.9 HP. This car has some basic characteristics of modern cars, such as spark ignition, water cooling cycle and steel tube frame. 18861On October 29th, German engineer karl benz applied for a patent for his motor vehicle. In June165438+1October of the same year, Karl Benz obtained the German patent (patent number: 37435a). This is considered to be the first modern car in the world. For the above reasons, people generally take 1886 as the first year of automobile, and some scholars take the year when Carl Benz made the first three-wheeled automobile (1885) as the year when the automobile was born.

1829, James of England invented a steam car with a speed of 25 kilometers per hour, which can be used as a large car. This kind of car is equipped with a heavy boiler, adding a lot of coal, emitting black smoke, polluting streets, making rumbling noise and frequent accidents. 1860, French worker Lou Noel invented the internal combustion engine, and used a gas engine with a horsepower of about/kloc-0 to drive the car, but the effect was not good. However, cars are produced under the influence of this internal combustion engine. Since then, many people want to improve the internal combustion engine and use it in cars. From 65438 to 0882, German engineer William Daimler began to study internal combustion engines. He invented an automatic ignition device that uses electric spark to ignite the engine. Then, on the basis of this invention, he made an excellent gasoline engine. This kind of engine rotates 900 revolutions per minute, which is simple and compact in structure and can generate great power. 1883, Daimler completed this gasoline engine, and the next year began to assemble it on two-wheelers, tricycles and four-wheelers to make a gasoline-powered car. In particular, the gasoline engine four-wheel truck manufactured by 1886 is equipped with an engine horsepower of L.5 and an hourly speed of 18km.