A method and a device for reducing the internal noise of a vehicle produced during the rolling of the tyre are described. The device comprises a plurality of elements made from open-cell expanded materials, for example expanded polyethylene, or from fibres of the mineral or textile type. These elements are introduced into the tyre during its mounting on the corresponding rim and are placed in the absence of restraints in the annular cavity delimited between the tyre and the rim. As a result of the rolling of the wheel, the various elements, under the action of the centrifugal force, are moved and pushed in a random way towards the inner surface of the tyre, producing a ragged surface whose presence, in combination with the open cells of said elements, modifies and damps the acoustic waves generated inside the tyre during the rolling of the tyre.
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