in the table most of the above cited tests are described more in detail in the paper by bourgois luc 34 survey of mechanical properties of steel cord and related test methods 34 tire reinforcement and tire performance astm stp 694 r a fleming an d i livingston eds american society for testing and materials 1979 pp 19 46 table______________________________________ prior art invention 2 12 u00d7 0 22 1 3 u00d7 0 22 inner sheath 12 u00d7 0 22 cc 9 u00d7 0 20 cc preformed______________________________________diameter mm 1 16 1 09 1 16breaking load n 1310 1223 1310elongation 2 74 2 73 3 01fatigue strength 950 1050 900 embedded n mm sup 2 rubber penetration 8 7 2 0 3 3 l h core migration yes no noadhesion 645 676 656accumulated gaps 0 0 12 0 04 mm ______________________________________ cc compact cord as may be derived from the table core migration is avoided in the cord according to the invention as in prior art cord 2 despite the fact that the accumulated gaps in the invention cord are much smaller 0 04 than in prior art cord 2 0 12 fig6 shows a tire 23 having a carcass 25 and a belt area 27 the belt area 27 is reinforced with the steel cord 1 likewise the carcass 25 may also be reinforced with the steel cord 1 it is to be understood that the invention is not limited to compact cord constructions comprising only one layer around the core but that.