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Which advantage does radial construction give?

  • A.A stiffer sidewall, which improves the cornering response and therefore the handling of the vehicle at speed
  • B.Lower cost
  • C.A greater load capacity for the same section, which follows from the cords running directly between the two beads
  • D.A flexible sidewall with a stiff, stable tread

Answer: D

Radial cords let the sidewall flex while the belts hold the tread flat on the road, which gives longer life, better grip and lower rolling resistance. Cross ply sidewalls are stiffer. The decoupling of tread and sidewall is the whole advantage. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Checking which component actually carries the load settles most questions of this kind at once. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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