Correct answer
A separate air reservoir.
A separate air reservoir. Sidewalls and beads are parts of the tyre: sidewalls protect its structure and beads seat it on the rim. The tyre holds air in its internal volume, but this is not a separate reservoir forming a component of its casing. Tyre structure includes several components; it is not necessarily limited to four parts and does not guarantee grip in all conditions.
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A separate air reservoir.
The beads.
The sidewalls.
The real exam in English is a translation of the Spanish original; compare both here.
Show the Spanish original
¿Cuál de estos elementos NO es una parte estructural de la cubierta de un neumático?
- Los talones.
- Los flancos.
- Un depósito de aire separado.(Correct answer)
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