Apparatus for checking a tyre , the apparatus comprising: ∘ a support adapted for receiving said tyre resting thereupon; ∘ a deformation system configured to deform a portion of outer surface of said tyre so as to form an elastically deformed portion of inner surface and an elastically deformed portion of outer surface on said tyre through physical contact; ∘ a first light source adapted for emitting a first light radiation to illuminate said deformed portion of outer surface with diffused light radiation, a first camera adapted for detecting a first image of said illuminated deformed portion of outer surface and for generating at least one control signal representative of said first detected image, and a first control unit that drives said first light source and said first camera ; ∘ a second light source adapted for emitting a second light radiation to illuminate said deformed portion of inner surface with grazing light radiation, a second camera adapted for detecting at least one second image of said illuminated deformed portion of inner surface and for generating at least one control signal representative of said at least one second detected image, and a second control unit that drives said second light source and said second camera ; ∘ a moving member adapted for setting said support in relative rotation with respect to said first light source , to said second light source and to said deformation system around a rotation axis of the tyre ; and ∘ a processing unit configured so that while said first light source and said second light source illuminate said deformed portion of outer surface and said deformed portion of inner surface, said deformation system acts and said moving member imparts said relative rotation. ∘ a support adapted for receiving said tyre resting thereupon; ∘ a deformation system configured to deform a portion of outer surface of said tyre so as to form an elastically deformed portion of inner surface and an elastically deformed portion of outer surface on said tyre through physical contact; ∘ a first light source adapted for emitting a first light radiation to illuminate said deformed portion of outer surface with diffused light radiation, a first camera adapted for detecting a first image of said illuminated deformed portion of outer surface and for generating at least one control signal representative of said first detected image, and a first control unit that drives said first light source and said first camera ; ∘ a second light source adapted for emitting a second light radiation to illuminate said deformed portion of inner surface with grazing light radiation, a second camera adapted for detecting at least one second image of said illuminated deformed portion of inner surface and for generating at least one control signal representative of said at least one second detected image, and a second control unit that drives said second light source and said second camera ; ∘ a moving member adapted for setting said support in relative rotation with respect to said first light source , to said second light source and to said deformation system around a rotation axis of the tyre ; and ∘ a processing unit configured so that while said first light source and said second light source illuminate said deformed portion of outer surface and said deformed portion of inner surface, said deformation system acts and said moving member imparts said relative rotation. <EOS>