Black is a good conductor of heat, meanwhile tires are made black, Why ?

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.

Adding carbon black also helps conduct heat away from certain hot spots on the tire; specifically, in the tread and belt areas, which can get particularly hot at times while driving.  This reduces thermal damage on the tire, which further extends its lifespan.

Carbon black itself is simply nearly pure elemental carbon in colloidal particle form.  It is classically made by simply charring any organic material.  Examples of this are Ivory Black, made by charring ivory or bones, and Lamp Black, made from the soot of oil lamps. Carbon black for industrial use today is typically produced as Furnace Black and Thermal Black.  Furnace Black is produced using heavy aromatic oils.  Thermal Black is produced using natural gas, generally methane, injected into a very hot furnace where, in the absence of much air, carbon black and hydrogen are produced.