Why tyres are made black ?

Originally rubber tires are white, which is the natural color of rubber. In the early 1900s, Binney & Smith began selling their carbon black chemicals to Goodrich Tire Company, as it was found that the use of carbon black in rubber manufacturing significantly increased certain desirable qualities for rubber meant to be turned into tires. 
Carbon black works as a reinforcing filler in rubber, which increases the durability and strength of the rubber. Specifically, adding about 50% by weight of carbon black increases the road-wear abrasion of the produced tire by as much as 100 fold and improves the tensile strength of the tire by as much as 1008%. The tensile strength, for those who don’t know, is the amount of force needed to pull something to its breaking or bursting point.