Excerpts from http://online.wsj.com/article/SB113158615653093082.html
Bridgestone has broken ranks with the rest of the US rubber industry
in recommending a maximum life span for passenger and light-truck
In a recent technical bulletin to its dealers, the tire maker said all
tires - including spares - that are more than 10 years old should be
replaced, regardless of their external appearance. The company cited
the same recommendation issued in September by the Japan Automotive
Tire Manufacturers Association.
Many US car makers have pushed ahead with such recommendations,
although their age recommendations vary and generally are shorter.
Earlier this year, Ford started urging consumers to replace tires
after six years. Ford said its research shows that tires degrade over
time, even when they are not being used.
The US tire industry, however, insists there is no science to support
Bridgestone's technical bulletin notes that although the company is
not aware of technical data that support a specific tire service life,
it believes it is appropriate to follow the Japanese tire industry's
The folly of mistaking a paradox for a discovery,
a metaphor for a proof,
a torrent of verbiage for a spring of capital truths,
and oneself for an oracle,
is inborn in us.