Tegger <tegger@tegger.c0m> wrote in article
<Xns99135C3FA90BCtegger@207.14.116.130>...

He MAY want to read the book, "The Racing & Performance Tire" by Paul Haney
- which is available through the SAE.

According to that book......

"Almost all fillers used in rubber goods manufacturing increase the modulus
or hardness, but carbon black also significantly improves tensile strength,
tear strength and road wear properties.......Higher strength is probably
due to interbonded particles preventing the growth of tear failures along
polymer chains."

"There are many varieties of carbon blacks, each imparting different
characteristics to a rubber compound. Particle size and physical properties
of the surface are important characteristics of carbon blacks. No one type
of carbon black can be called optimum for a tire....."

There is an entire page - and several other references throughout the book
-  on how the carbon black particles interact with the other materials in a
rubber compound........

While it MAY be an insignificant point, there is no association made
between carbon black and UV in the book on tire design.

Some probably would. In this day of advanced chemistry & rubber compounds,
I'm surprised we don't see someone offering colored tires.