Patent ID: 6102094
Filing Date: 2000-08-15
Classification: B60C,Y10T

Abstract:
A pneumatic radial tire comprising; a pair of bead portions, a pair of sidewall portions, a tread portion toroidally extending between both sidewall portions, a radial carcass reinforcing said sidewall portions and a belt reinforcing the tread portion at the outer circumferential side of the radial carcass, a high-hardness rubber layer having a JIS A-hardness higher by 3 degrees or more than rubber hardness of a tread rubber is arranged in a region at a meridional section of the tire which is located between an outermost position of a ground contact end of said tread portion at the meridional section of the tire under a normal loading in case of truck and bus tire and under a loading corresponding to 70% of a normal loading in case of tires having a size smaller than that of the truck and bus tire at an inflation state under a normal air pressure in accordance with the maximum loading capacity and a position measured from a bead core to a 1/2 point of the carcass height from the bead core under a tire inflation of said normal air pressure, and a surface of said high-hardness rubber layer at least facing an inner periphery side of the tire at the meridional section of the tire and spaced from said carcass and said belt has a wavy surface.