IMHO the rule to change tires at 3,4,5, years or whatever, regardless of their condition, is contradictory to all tire manufacturer's advice, I think its a simple gimmick started by tire dealers to sell more tires. The people who design and make the tires know best, and recommending shorter life would mean they sell more, but the better tire manufacturers do not suggest that short life many are hung up on.
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1977 Newell Classic
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