Patent ID: 6786260
Filing Date: 2004-09-07
Classification: B60C

Abstract:
A pneumatic radial tire having right and left bead portions, at least one carcass layer being laid between the bead portions, a plurality of belt layers being arranged on an outer periphery of the carcass layer in a tread portion, a tread surface of the tread portion being formed into a curved surface so that parts thereof in shoulder portion sides is tire-radially inwardly of that in a crown portion side,wherein, when said pneumatic radial tire is attached to a standard rim specified in JATMA with its air pressure being 180 kPa and with no load applied thereto, a tire meridian cross-sectional configuration of a tread surface portion of said tread surface on at least one side of a tire center line is arranged such that, when a position A is an intersection of the tire center line and the tread surface and a position B is an intersection of a straight line P drawn orthogonal to the tire axis from an edge of an innermost belt layer of said belt layers and the tread surface, an angle &agr; between a straight line X connecting said positions A and B and a straight line Y drawn perpendicular to the tire center line from the position A is set in a range of 8 to 10 degrees.