The invention relates to a metal cable (C-I) that comprises two layers (Ci, Ce) having a 3+N structure and is gummed in situ, and that comprises an inner layer (Ci) made of three core threads (10) having a diameter di and wound together into a helix according to a pitch pa, and an outer layer (Ce) of N threads (11), N ranging from 6 to 12, having a diameter d2 and wound together into a helix having a pitch p2 around the inner layer (Ci), said cable being characterised in that it has the following characteristics (di, d2, pi, p2 in mm) : - 0.20