Patent Number: 6,253,816

Title: Pneumatic radial tire with particular belt reinforcing layer fiber cord and particular bead filler height

Abstract: 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.degree. C., and have a 1.5 to 6.0% elongation under load of 0.7g/d at the temperature of 170.+-.5.degree. C. The height L of each of the bead fillers corresponds to 20 to 60% of the cross sectional height T of a tire.

Inventors: Ide; Keita (Tokyo, JP)

Assignee: Bridgestone Corporation

International Classification: B60C 9/22 (20060101); B60C 15/06 (20060101); B60C 009/20 (); B60C 009/22 (); B60C 015/00 (); B60C 015/06 ()

Expiration Date: 07/03/2018