Watched a Discovery Channel presentation on auto technology and tire
technology. A new combo tire/wheel is coming down the pike. More metal,
less rubber. In fact, the only rubber in the tire is the tread itself
which is about 1 to 1-1/2 inches thick. . No sidewalls - they are part
of the wheel. . When you  wear out the tread piece, just replace the
tread on the wheel. Reduces waste by way of discarding tires. These new
ones are recyclable. Tires are 50% charcoal. At that level, the tire
loses its stretch qualities. Addition of nano-technology increases stretch.

Amazing stuff that is coming.

John Rodgers
88 GL Driver