[Spridgets] 155sr-13 tires

[Peter Shull]

Tire Rack tech article:

http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=138

Reviews the variables and cites variou recommendations:
The British Rubber Manufacturers Association: "... unused tyres should not 
be put into service if they are over six years old and that all tyres should 
be replaced ten years from the date of their manufacture."

The Japan Automobile Tire Manufacturers Association: "... vehicle tires 
promptly inspected after five years of use to determine if the tires can 
continue to be used ... all tires (including spare tires) that were made 
more than ten years ago be replaced with new tires."

"... the U.S. divisions of DaimlerChrysler and Ford Motor Company joined 
their European colleagues in 2005 by recommending the tires installed as 
Original Equipment be replaced after six years of service."