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On my fun cars, they get changed. On my truck (don't use it that much) and other vehicles, I leave then on and drive them until they get close to the wear bars. Normally, they are worn after 6 or 7 years so they get new tires. like many of us in socal, (just think of all the gardeners and others with very on old tires on our roads) we just keep on rolling them. I have driven on 7-8 year old tires, and they have been fine
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