http://en.wikipedia.org/wiki/Tire#Dangers_of_aged_tires
tire companies would love it if we switched tires every six years, regardless of tread wear. in theory, i imagine they aren't making it up in terms of rubber degrading over time. i have never had bike rubber that old, but snow tires for my car? yep. in real world conditions, i ran a set of blizzaks for two seasons (low kms) that were 10 years old. didn't have a problem, but hey, don't use this as the determinant for choosing tires for a 2 wheeled vehicle that you rely on at 100+km/h. . .
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