Tyre casing in the shape of a torus about a reference axis, equipped with a passive radiofrequency transponder (1, 1bis) and comprising: - a crown block comprising a crown reinforcement having an axial end at each of its edges, and a tread, connected at each of its axial ends to a bead having an inner end situated axially and radially on the inside of the bead with respect to the reference axis, via a sidewall, - first filaments going back and forth, in an adjacent arrangement and aligned circumferentially, anchored in said beads with, in each bead, loops each connecting back and forth filaments, said first filaments forming at least a circumferential alignment defining a carcass reinforcement separating the tyre casing into two regions, inner and outer, with respect to the carcass reinforcement, - in each bead, means for anchoring said first filaments, comprising second filaments oriented circumferentially axially bordering the first filaments, and forming at least one spiral (85, 88), - a first layer of elastomer compound forming the exterior surface of the tyre casing in the region of the bead, said first layer of elastomer compound being intended to come into contact with the rim, - a second layer of elastomer compound situated radially on the outside in contact with the first layer of elastomer compound forming the exterior surface of said sidewall, - the passive radiofrequency transponder (1, 1bis), comprising a main core defining a first longitudinal axis, a first primary cover filament wound in turns around the main core defining a winding diameter D and an electrical insulation device (1021, 1024, 1025, 2001, 2002), disposed radially on the outside of the first primary cover filament with respect to the first longitudinal axis, - the first primary cover filament comprising at least two conductive filamentary elements (1003a, 1003b), the diameter of which is between 0.05 and 0.15 millimetre, galvanically connected to at least one electronic chip comprising a radiofrequency transmission-reception component, - the main core having a stiffness lower than the maximum stiffness of the first primary cover wire (1013a, 1013b), the electrical insulation device (1021, 1024, 1025, 2001, 2002) having a mean relative dielectric permittivity less than or equal to 10, preferably less than 5, over a thickness greater than or equal to one-sixth of the winding diameter D of the first primary cover filament, the dipole radiating antenna being located in line with at least two first filaments of the carcass reinforcement, the passive radiofrequency transponder (1, 1bis) being located axially on the outside of the inner end of the bead and radially between the radially outermost end of the at least one spiral and the axial end of the crown reinforcement and the thickness of elastomer compound separating the outer cover filament (1013a, 1013b, 1024, 1025) of the passive radiofrequency transponder (1, 1bis), located radially outermost with respect to the first longitudinal axis, and the reinforcing elements being greater than 0.5 millimetre, preferably greater than 1.0 millimetre. - a crown block comprising a crown reinforcement having an axial end at each of its edges, and a tread, connected at each of its axial ends to a bead having an inner end situated axially and radially on the inside of the bead with respect to the reference axis, via a sidewall, - first filaments going back and forth, in an adjacent arrangement and aligned circumferentially, anchored in said beads with, in each bead, loops each connecting back and forth filaments, said first filaments forming at least a circumferential alignment defining a carcass reinforcement separating the tyre casing into two regions, inner and outer, with respect to the carcass reinforcement, - in each bead, means for anchoring said first filaments, comprising second filaments oriented circumferentially axially bordering the first filaments, and forming at least one spiral (85, 88), - a first layer of elastomer compound forming the exterior surface of the tyre casing in the region of the bead, said first layer of elastomer compound being intended to come into contact with the rim, - a second layer of elastomer compound situated radially on the outside in contact with the first layer of elastomer compound forming the exterior surface of said sidewall, - the passive radiofrequency transponder (1, 1bis), comprising a main core defining a first longitudinal axis, a first primary cover filament wound in turns around the main core defining a winding diameter D and an electrical insulation device (1021, 1024, 1025, 2001, 2002), disposed radially on the outside of the first primary cover filament with respect to the first longitudinal axis, - the first primary cover filament comprising at least two conductive filamentary elements (1003a, 1003b), the diameter of which is between 0.05 and 0.15 millimetre, galvanically connected to at least one electronic chip comprising a radiofrequency transmission-reception component, - the main core having a stiffness lower than the maximum stiffness of the first primary cover wire (1013a, 1013b),