Back in the day, tires typically would wear out before they got too old. Thinning treads is the consumer indicator that a tire needed to be replaced and, 30 to 40 years ago, that was probably around the 20 to 30,000-mile usage marker.
Nowadays, tires are more durable and can last upwards of 60 to 100,000 miles. The downside, however, is consumers are unaware that steel-belted radial ply tires, despite their toughness, face aging challenges because they are made of rubber, a product that oxidizes and hardens over time.
Older tires are vulnerable to catastrophic failures since excessive brittleness from oxidation can trigger tread and belt separations. Should those tires be attached to vehicles that travel roads in hot, dry climates, then those tires will deteriorate even faster.
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