A method of manufacturing an aerial micromodule cable with excess length of an optical core is disclosed, the cable comprising a cable jacket defining a cavity in which the optical core is arranged, said cable having two rigid strength members embedded in the wall of the jacket; the method comprising guiding the cable over a wheel; wherein a first plane (P1) intersecting the centre of gravity (C1) of the cable cavity is parallel to a second plane (P2) intersecting the two rigid strength members, said first and second planes (P1, P2) being offset from each other, and wherein, during said guiding, the two rigid strength members are positioned closer to the wheel than the first plane (P1) so as to cause the optical core to have a core excess length of at least 0.05%.