Discussion
Which material forms the belt of a modern radial car tyre?
Answer: A
Steel belts beneath the tread restrain it against centrifugal growth and keep it flat under cornering load. A nylon cap ply is often wound over the steel belt at high speed ratings, which makes the last option a near miss rather than nonsense. The order in which the effects act is what decides the outcome, so it is worth establishing first. Tracing the requirement back to the physical constraint that produces it makes the answer follow. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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