Abstract: A run-flat tire (11) comprising a crown comprising a crown reinforcement (21, 22) surmounted by a tread (30); two sidewalls (40) extending the crown radially inward; two beads (50) radially inward to the sidewalls and each comprising an annular reinforcing structure (60); at least one carcass reinforcement (71, 72) anchored in each of the beads and extending from the beads through the sidewalls toward the crown; and at least one sidewall insert (80) axially on the inside of the carcass reinforcement, comprising at least one polymer compound; wherein at least one sidewall of the tire further comprises: at least one additional sidewall reinforcement (90) comprising reinforcing elements, positioned axially on the outside of the carcass reinforcement, the radially inside end (91) of the additional sidewall reinforcement being, in any radial section, radially on the inside of the axial straight line (100) that passes through those points in the sidewalls at which the carcass reinforcement has its greatest axial wi

Abstract: A rigid core which at least partly defines a manufacturing form for the inside surface of a tire, the core comprising a plurality of circumferentially adjacent segments (10) arranged side by side in contact with each other via their transverse faces, said transverses faces of at least one segment being convergent radially away from the core, each of said segments comprising an attachment part (13) for attachment to a locking member for locking the various segments (10), said attachment part (13) being provided at the radially inner edge of each of the segments (10), in which core at least one electrical heating resistor (17) is moulded into each of the segments (10); the electrical resistor comprises a heating resistor wire (17) running in a steel tube (16), and said segment (10) is essentially made from a grade of cast iron whose melting point is below the melting point of said steel tube (16).