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Why does running a tire underinflated destroy it even when the tread looks fine?
- A.The sidewalls flex too much, building heat that breaks down the tire's internal structure
- B.Underinflation only wastes a little fuel
- C.The tire becomes too light to grip the road
- D.Underinflation makes the tire too stiff
Correct answer
A. The sidewalls flex too much, building heat that breaks down the tire's internal structure
Why
Heat is the real killer: an underinflated tire bends with every revolution, and the flexing cooks the cords and rubber from the inside. Many highway blowouts are the delayed result of miles driven low on air, not of a sudden road hazard.
Manual topic: Tires - Inflation · From the General Knowledge practice bank (GK-221).