PNEUMATIC TIRE AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To avoid damage such as peeling-off easily generated at the width end of a belt. SOLUTION: This pneumatic tire is provided with a carcass comprising at least one sheet of ply having a cord approximately radially arranged between bead cores buried in a pair of beads respectively; a belt constituted of a plurality of sheets of cord layers covering a steel cord with rubber at the outer peripheral side of a crown of the carcass; and a tread part reinforced by the belt. A high elongation protection layer of a substantially perfect circle having a wider width than the width of the belt, having elongation at breaking being 3.5-7% and having a ratio of radial ununiformity along the tire circumferential direction of the width end against a section height being 1.83% or less is adjacently arranged on the outer peripheral side of the belt. COPYRIGHT: (C)2004,JPO&NCIPI