Tire core

A tire cord comprising from four to seven filaments twisted together so as to form a core and a sheath surrounding the core, wherein

• said from four to seven filaments change place repeatedly along the longitudinal direction of the cord such that one of the filaments forms the core in a portion, but in a different portion of the cord, said one of the filaments forms part of the sheath, thereby defining a plurality of first parts with the core and a plurality of second parts without the core which are disposed alternately in the longitudinal direction of the cord, wherein each of the first parts consists of the core consisting of one of the filaments and the sheath consisting of all the remaining filaments surrounding the core, and each of the second parts is defined by the sheath consisting of all said four to seven filaments surrounding a central space.