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A tyre's ply rating is an indication of its

  • A.Load-carrying capacity
  • B.Rolling resistance
  • C.Tread compound hardness
  • D.Maximum permitted speed

Answer: A

It is a legacy measure carried over from the days of actual cotton plies, and it now simply expresses strength. Speed is rated separately and both limits must be satisfied, since a tyre strong enough for the load may still be unrated for the takeoff speed.

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