Brake disc of rotation axis (X-X), comprising - a support carrier, destined to be coupled to a wheel hub of a vehicle, - a braking band, destined to co-operate with a disc brake calliper, comprising two flanges (20, 22) connected by a plurality of connection elements which define ventilation channels for the passage of a flow of cooling air over the braking band, - at least one drive element able to connect the support carrier and the braking band to each other so as to transmit the braking forces exchanged by the braking band and the calliper to the hub, characterised by the fact that - at least one connection element has a resistant section variable in an axial direction parallel to the rotation axis (X-X), said resistant section being measured in an area essentially parallel to the direction of the air flow inside the ventilation channels, wherein said direction of the air flow is essentially a radial direction, perpendicular to the axis (X-X) and incident with it, - the connection element having a median resistant section, measured in relation to an area substantially parallel to the direction of the air flow inside the ventilation channels of the braking band, - the connection element having a connection resistant section (60,62) on an inner lateral face (70,72) of a respective flange (20,22), said connection resistant section (60,62) being measured in relation to an area essentially parallel to the direction of the air flow inside the ventilation channels of the braking band, - the resistant section of the connection element progressively increasing as it moves from the median resistant section towards the respective connection resistant sections (60, 62), wherein the connection elements have a minimum cross-section at the median resistant section and are symmetrical in relation to the centre line plane of the brake disc, wherein the flanges (20,22) comprise three rows of connection elements, respectively a radially external row next to an outer radial rim (C e) of the flanges (20,22), a radially internal row (36"') next to an inner radial rim (C i) of the flanges (20,22), a radially intermediate row (36") radially positioned between said radially external and internal rows (36',36"'), said rows angularly brushing the entire circumference of the flanges(20,22). - a support carrier, destined to be coupled to a wheel hub of a vehicle, - a braking band, destined to co-operate with a disc brake calliper, comprising two flanges (20, 22) connected by a plurality of connection elements which define ventilation channels for the passage of a flow of cooling air over the braking band, - at least one drive element able to connect the support carrier and the braking band to each other so as to transmit the braking forces exchanged by the braking band and the calliper to the hub, characterised by the fact that - at least one connection element has a resistant section variable in an axial direction parallel to the rotation axis (X-X), said resistant section being measured in an area essentially parallel to the direction of the air flow inside the ventilation channels, wherein said direction of the air flow is essentially a radial direction, perpendicular to the axis (X-X) and incident with it, - the connection element having a median resistant section, measured in relation to an area substantially parallel to the direction of the air flow inside the ventilation channels of the braking band, - the connection element having a connection resistant section (60,62) on an inner lateral face (70,72) of a respective flange (20,22), said connection resistant section (60,62) being measured in relation to an area essentially parallel to the direction of the air flow inside the ventilation channels of the braking band, - the resistant section of the connection element progressively increasing as it moves from the median resistant section towards the respective connection resistant sections (60, 62),