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Which component of a tyre carries the inflation pressure loads?

  • A.The carcass plies
  • B.The tread rubber, whose thickness resists the pressure and therefore determines the load the tyre may carry
  • C.The bead wire
  • D.The sidewall rubber, which is thicker than the tread and therefore withstands the pressure within the tyre

Answer: A

The carcass plies of textile or steel cord take the pressure loads and transmit them to the beads, while the rubber seals and protects. Tread rubber provides grip and wear resistance. The cords are the structure and the rubber is the covering. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Naming what changes and what stays the same is the reliable route through questions of this shape. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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