Steel cord with reduced residual torsions

A steel cord adapted to reinforce a breaker or belt ply in a rubber tire,

• said steel cord comprising a core group and a sheath group,
• said core group consisting of two to four core steel filaments with a first diameter dc,
• said sheath group consisting of one to six sheath steel filaments with a second diameter ds,
• the ratio dc/ds of said first diameter dc to said second diameter ds ranging from 1.10 to 1.70,
• said core steel filaments being untwisted or having a twist pitch of greater than 300 mm,
• said sheath group being twisted around said core group with a cord twisting step in a cord twisting direction,
• wherein the ratio ρ of the absolute value of the difference in residual torsions between the core group and the sheath group to the absolute value of the difference in saturation level between the core group and the sheath group ranges from 0.15 to 0.65.