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It's not worth it. Tires have about a five year shelf life.
No need to perpetuate another myth;
http://www.motor.com/article.asp?article_ID=1371
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Dan Zielinski, Senior Vice President, Public Affairs, for the Rubber Manufacturers Association in Washington, DC, told me that his association "does not recommend a removal date for tires based on age because there's no scientific information to back it up." He explained that extensive studies of thousands of junkyard tires do not back up the notion that tires just deteriorate with time
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I asked Jim Davis, spokesman for Goodyear Tire and Rubber, about the problem of aging tires. Davis said: "There is no scientific evidence that leads to the conclusion that there should be a tire service limit. Different groups have studied it. Different companies have studied it. Tire companies have studied it. Nobody has come out with any kind of report indicating any kind of scientific data to support a specified tire service life."
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Some manufacturers would like to see tires replaced after six years, some after ten years. What about the idea called for by some safety experts of replacing tires that are six years old even if they don't appear to be worn? According to Tyson, "that six-year clock is pretty much at the conservative end of the various recommendations that are out there. The problem is there is a pretty wide range of differences depending on the region of the country you live in. On vehicles that have been in a warm climate like what you would find in the southern part of the United States, tire aging seems to be a greater issue than up in Maine, for example. For most vehicles that are used on a regular basis it's not an issue because you'll wear out the tires before they get old."
Our local junkyards keep servicable tires in 'the tire shed', out of the sun. Standard practice for years.
Alex.