Why are the car bike trucks etc.. tyres are black ?
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The black color of tires comes from carbon black, a readily-available material that provides greatly improved wear characteristics and heat-dissipation capabilities when added to rubber compounds.
Natural rubber is off-white in color, and in fact the first rubber tires were white. Pure vulcanized rubber is soft and wears out very quickly, however, and tends to heat up and deform under load. So you want to mix something in with the rubber that adds temperature stability and hardness -- originally this was typically zinc oxide which made the tires bright white in color.
Around the time of World War I zinc oxide began to be replaced with carbon black, which had even better characteristics and was becoming more available as a byproduct of coal and oil production. As the benefits of adding carbon black to the compound became known, that additive was used just on the tread portion, while the side of the tire remained the natural color -- this is where the (now mostly gone) tradition of "whitewall tires" came from. In a true (antique) whitewall tire the light color is present througout the wall of the tire; later versions overlaid a thinner layer of white rubber on the black tire to give a whitewall look:

Thank you!
Natural rubber is off-white in color, and in fact the first rubber tires were white. Pure vulcanized rubber is soft and wears out very quickly, however, and tends to heat up and deform under load. So you want to mix something in with the rubber that adds temperature stability and hardness -- originally this was typically zinc oxide which made the tires bright white in color.
Around the time of World War I zinc oxide began to be replaced with carbon black, which had even better characteristics and was becoming more available as a byproduct of coal and oil production. As the benefits of adding carbon black to the compound became known, that additive was used just on the tread portion, while the side of the tire remained the natural color -- this is where the (now mostly gone) tradition of "whitewall tires" came from. In a true (antique) whitewall tire the light color is present througout the wall of the tire; later versions overlaid a thinner layer of white rubber on the black tire to give a whitewall look:

Thank you!
Answered by
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The black color of tires comes from carbon black, a readily-available material that provides greatly improved wear characteristics and heat-dissipation capabilities when added to rubber compounds.
Natural rubber is off-white in color, and in fact the first rubber tires were white. Pure vulcanized rubber is soft and wears out very quickly, however, and tends to heat up and deform under load. So you want to mix something in with the rubber that adds temperature stability and hardness -- originally this was typically zinc oxide which made the tires bright white in color.
Natural rubber is off-white in color, and in fact the first rubber tires were white. Pure vulcanized rubber is soft and wears out very quickly, however, and tends to heat up and deform under load. So you want to mix something in with the rubber that adds temperature stability and hardness -- originally this was typically zinc oxide which made the tires bright white in color.
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