Walter R. wrote:
Brings up the question: How long will tires last when they are in use? I
drive 3000 miles a year. My tires are 8 years old. They have a lot of tread
left but, are they still save? Do tires last longer when they are mounted
and in use?


Sunlight is the primary culprit, so probably not. If you start to see
sidewall cracks, it's probably time to consider new tires.

nate

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