Abstract: There is provided a pneumatic radial tire having favorable steering stability required as a high performance radial tire designed for high performance cars, durability and good cost performance. The pneumatic radial tire is framed by a carcass 1 toroidally extending between a pair of bead portions 11 and has at least two layers of interlacing belt layers 2 (2a, 2b) formed by rubberizing steel cords and disposed around an outside of a crown portion thereof in a radial direction. The steel cord has a single strand structure or a core-single layer sheath structure composed of six to ten steel wires of 0.10 to 0.20 mm in diameter, a number of driven steel cords is 40 cords/50 mm or more and a distance between the adjacent steel cords within the belt layer is 0.3 mm or more.

Abstract: A vulcanizable elastomeric composition comprises a moisture stabilized polymer, a reinforcing filler comprising silica, a processing aid, and a cure agent comprising an effective amount of sulfur to achieve a satisfactory cure of the composition. The moisture stabilized polymer comprises the hydrolysis reaction product of a hydrolyzable substituent of an alkoxysilane terminated polymer reacted with a viscosity stabilizing effective amount of a viscosity stabilizing agent comprising a first long chain alcohol, prior to contacting the polymer with water. The processing aid is a second long chain alcohol, an alkyl alkoxysilane, or a mixture thereof.