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Which construction has cords running at an angle across the carcass?

  • A.Belted radial
  • B.Run flat construction, in which the sidewall is reinforced so that the tyre may be used after a loss of pressure
  • C.Cross ply or bias ply
  • D.Radial ply, in which the cords run directly from bead to bead at right angles to the direction of travel

Answer: C

Cross ply tyres lay alternate plies at around forty degrees to the centre line, which couples the tread and the sidewall. Radial cords run straight across at ninety degrees. The distinction governs almost every performance difference between the two. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.

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