Jeff wrote:

> However, different makers may use different types of rubber and other
> synthetic compounds, explaining some of the differences. And different
> manufacturing techniques may require special equipment. Both of these
> will affect the cost that it takes to produce a tire.

And that will be money well spent if it results in a better product. Of
course if it only increases cost with no real benefit, then the
manufacturer is now at a competitive disadvantage (lower profit, higher
consumer cost or both).

Bill Putney
(To reply by e-mail, replace the last letter of the alphabet in my
address with the letter 'x')