| 摘要 |
A pneumatic radial tire in which excellent stability and controllability can be provided and a larger amount of road noise can be reduced. A belt reinforcing layer is disposed outwardly in the radial direction of a tire so as to reinforce the whole portion or the end portions of a tread portion. The belt reinforcing layer is formed by spirally winding a rubber-coated and narrow strip made of a fiber cord/cords around a tire. A pair of bead fillers are disposed directly above bead cores of a pair of bead portions. The cords of the belt reinforcing layer are made of organic fiber cords, and have a 2.7% or less elongation under load of 1.4g/d at the temperature of 50+/-5 DEG C, and have a 1.5 to 6.0% elongation under load of 0.7g/d at the temperature of 170+/-5 DEG C. The height L of each of the bead fillers corresponds to 20 to 60% of the cross sectional height T of a tire. <IMAGE> |
