why the colour of tyres of vehicles always black and not in other colours? is there any scientific reason ?

Answer 1

Yes, there is a scientific reason. The black is carbon powder added to the rubber. Basically, carbon improves the puncture strength and tread wear resistance to rubber.

They were not always black. At one time, most of the pneumatic tires were white, as depicted in the following photo:

http://www.autogallery.org.ru/k/o/04oldsNFrenchfronttouringrunabout1cyl5inx6in_HMN.jpg

But you were always fixing flats on these tires at the side of the road because the rubber was soft and gummy.

In the '20's and early '30's you could buy replacement white tires but they cost more than black tires. White tires denoted a soft pillowy, cloud-like, deluxe ride.

Whitewall tires are the extension of the original white tires, whose treads were hard to keep white because of the dirty roads. So there was no benefit to making an all-white tire if it always looked black on the tread area. The first white-wall tires were double white walls - or white walls on both sides of the tire, like in this picture:

http://www.100-jahre-sportwagen.de/images/desktop/DUESENBERG_J_1928_01_1024.jpg

But as fenders started wrapping around the body, you could not see the inside wall, so they became single whites.

But the treads were black because the carbon added to the rubber made them last longer, and carbon is black.

Answer 2

Black colour is a heat resistant colour so the tyres are made with black rubber.

Answer 3

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.

Life Extension :

While different colored novelty tires exist and are available for customers to purchase, they aren’t meant to be used for daily driving. Your black, boring, yet reliable tires actually have a good reason for their specific color, and it has to do with the longevity and safety of your tires.

Being black is the result of the manufacturer’s attempts to extend the life of their automotive products. And extend it, it does – by a considerable amount. The color originates from the combination of stabilizing chemicals which are added and blended with the tire polymer during the production of a tire.

Super Carbon Black :

The chemical responsible is called ‘carbon black‘ and it’s added to protect your tires against ozone and UV damage. Manufactures found that by adding the chemical, it drastically prolongs the life of the tire. So much so, that all tire manufacturers use this same additive in tire production.

Carbon black also has the capability to resist the corrosive effects of ozone and absorb the UV rays to convert them into heat.

Answer 4

Since carbon is added to tyres to increase the wear and heat resistance and also to increase the overall shear qualities of the rubber, the tyres are black.

Answer 5

First - it's cheaper... and factories save alot! We all know that raw source of tyres are from rubber trees.. When they are processed the end product is more of a dark gray color to black. Adding colors would entail additional cost

Second, they have international standards to follow .. So all tyre companies should follow suit..

Third, Government doesnt allow this.. Its like the transporation law that doesnt allow you to paint your car shiny Silver color since it reflects light and may cause accidents..

just my two-cent :)

Answer 6

Blac k colour of tyres syncorize with black colour of Road so that car driver following it should not have any rainbow effect .

Answer 7

PowerChairs and Wheelchair tyres - what to look for, what tyres to buy
Personally I always use black tyres because they are intended for the road and ... mind black! Colour, if you have white carpets stick with grey tyres! ...
http://www.powerchair-review.fsnet.co.uk/powerchair-wheelchair-tyres.htm

Answer 8

I have seen newer style tyres in red, orange, green, blue, yellow, white as well as camo. Many older bikes came with red or white tyres and you can still get them.

Answer 9

not anymore just consumer preference

at one time a material called carbon black was added for wear resistance ( the first tires were beige )

there have been colored tires in the last few years they were sales disasters ( they were limited production trial runs )

Answer 10

No just production costs being kept to a minimum