Black wall tires.
You might be thinking of "white wall" tires.
The letter which has clear and simple content.
It stands for Black Serrated Letters on the sidewall of the tire. OWL stands for Outlined White Letters.
(in the US) White with black letter/numerals.
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. But you were always fixing flats on these tires at the side of the road because the rubber was soft and gummy.
black, clack, crack, track, trick, trice, trite, write, white
who is the model in the white allen Chevrolet comercials
orca
oreo
Skunk.
Bikes can be any shade of white, black, brown, gray, red, orange, yellow, pink, purple, green, or blue. A bike's tires are black or white. You can even buy designer tires that are any color or patterned.
Scarlett's Letter