Why can not the wheels be blue?
Rubber has a good elasticity, with rubber to do tires, can reduce the movement of the bumps, but pure rubber can not withstand friction, use it will soon be thin, worn and scrapped. Scientists have found that in the pure rubber by adding some carbon black, can improve the rubber wear resistance. Just the rubber "face" darkened. Tire made with carbon black rubber, not only to maintain a good flexibility, but also greatly improve the wear resistance, extending the use of tires, so we see a variety of tires, are generally black. Today, there are about 30% of the tires inside the composition of carbon black. Of course, with the development of the tire industry will certainly have other raw materials to replace the original raw materials, there may be other colors, Michelin developed the world's first color tires. Like children's toy car only focus on color, wear is secondary, add some colorants, tires are color.
