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Which treatment addresses the tyre cavity resonance?

  • A.A stiffer sidewall, which raises the frequency of the resonance above the range within which it can be heard
  • B.A larger wheel
  • C.Increased inflation pressure, which alters the speed of sound within the cavity and therefore shifts the resonance
  • D.Acoustic foam bonded inside the tyre

Answer: D

A ring of open cell foam inside the tyre absorbs the standing wave in the air cavity and can reduce the resonant peak by several decibels. Several manufacturers now specify such tyres as original equipment. Wheel resonators tuned to the same frequency are an alternative approach acting on the same phenomenon from the rim side.

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