A swing girder for use in a scaffold system of the ring scaffold type including standards (12, 112) having, arranged at regular distances, ring-shaped rosettes with coupling recesses, the swing girder comprising: - a top-girder of which a top-girder axis extends in a swing girder plane in a swing girder main direction; - a bottom-girder of which a bottom-girder axis extends parallel to the swing girder main direction in the swing girder plane; - a number of connecting tubes which interconnect the top-girder and the bottom-girder with each other; - two fixed rosette couplings (26, 34) which are fixedly connected respectively with a first end of the top-girder and a first end of the bottom-girder; - a swing connector assembly which comprises two pivotable rosette couplings (40, 48) which are connected respectively with a second end of the top-girder and a second end of the bottom-girder in a manner pivotable around a pivoting axis; characterized in that - a lower of the two pivotable rosette couplings (40, 48) is a pivotable girder-support coupling which includes a support plate extending perpendicular to the swing girder plane and the pivoting axis which is connected with the second end of the bottom-girder in a manner pivotable around the pivoting axis, wherein the pivotable girder-support coupling includes at least one positioning pin connected with the support plate, which is at a side of the support plate facing away from the top-girder; wherein the swing connector assembly further comprises: - a connecting rod which connects the two pivotable rosette couplings (40, 48) with each other, so that the two pivotable rosette couplings (40, 48) always have the same pivoted position around the pivoting axis relative to the swing girder plane. - a top-girder of which a top-girder axis extends in a swing girder plane in a swing girder main direction; - a bottom-girder of which a bottom-girder axis extends parallel to the swing girder main direction in the swing girder plane; - a number of connecting tubes which interconnect the top-girder and the bottom-girder with each other; - two fixed rosette couplings (26, 34) which are fixedly connected respectively with a first end of the top-girder and a first end of the bottom-girder; - a swing connector assembly which comprises two pivotable rosette couplings (40, 48) which are connected respectively with a second end of the top-girder and a second end of the bottom-girder in a manner pivotable around a pivoting axis; - a lower of the two pivotable rosette couplings (40, 48) is a pivotable girder-support coupling which includes a support plate extending perpendicular to the swing girder plane and the pivoting axis which is connected with the second end of the bottom-girder in a manner pivotable around the pivoting axis, wherein the pivotable girder-support coupling includes at least one positioning pin connected with the support plate, which is at a side of the support plate facing away from the top-girder; - a connecting rod which connects the two pivotable rosette couplings (40, 48) with each other, so that the two pivotable rosette couplings (40, 48) always have the same pivoted position around the pivoting axis relative to the swing girder plane.