Abstract: A tire reinforcing component, preferably a breaker for a radial tire, is formed from an elastomeric ply reinforced by a single continuous cord (7) which extends back and forth from edge (14) to edge (15) across the ply in a zig-zag formation in which traverses (8) (9) of the cord are parallel to each other, and a series of loops (10) (11) is formed at each edge. The ply has its edge margins (12) (13) folded inwards so that the looped edges (14) (15) lie adjacent the centerline (X--X) of the ply.A breaker of this construction is arranged preferably so that the looped edges (10) (12) are located on the radially inner side of the breaker.