▎ 摘　　要

NOVELTY - The tire (2) has a longitudinal groove heating unit that is provided with a resonant sound reducing unit composed of a variable material arranged on a graphene, where the variable material comprises resonance sound reduction protrusions (24) formed in a certain length and shape, and grooves through rigidity and relaxation depending on presence or absence of an electrical signal of an electronic control device (12). A groove side layer (8) of the longitudinal groove is raised and restored by a push-pull action when the variable material is stiffened and relaxed. USE - Pneumatic tire. ADVANTAGE - The resonance reducing protrusions are easily formed on each surface layer of the groove facing within the vertical groove when the resonance reducing unit provided in the longitudinal groove is operated when necessary so as to attenuate resonant sound in a longitudinal groove of the tread when the tire is rolled. The tire allows electrical energy charged in the graphene by rolling motion of the tire to operate the resonance sound reduction unit when an electrical signal from the electronic control device is received. DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the pneumatic tire. 2Pneumatic tire 4Tread 8Groove side layer 12Electronic control device 24Resonance sound reduction protrusions