Patent ID: 9102201
Filing Date: 2015-08-11
Classification: B60C,Y02T

Abstract:
1. A run-flat tire comprising: an aspect ratio being in a range of from 50% to 60%; a tread portion; a pair of sidewall portions; a pair of bead portions each having a bead core therein, each of said bead portions having a thickness in a range of from 12 to 16 mm at a position that has a 17 mm height from a bead base-line; a carcass consisting of a single ply of cords which extends between bead cores through the tread portion and sidewall portions; a pair of sidewall reinforcing layers each having a crescent cross-sectional shape and disposed axially inwardly of the carcass in each said sidewall portion, said sidewall reinforcing layers made of rubber having a complex elastic modulus in a range of from 6 to 12 MPa, said sidewall reinforcing layers having radially outer ends positioned higher than a buttress position that has a height of 0.72 times a tire section height from the bead base-line, said sidewall reinforcing layers having radially inner ends positioned lower than a first bead position that has a height of 0.22 times of the tire section height from the bead base-line; a pair of sidewall rubber elements each of which is disposed axially outwardly of the carcass in each said sidewall portion; and a pair of bead apex elements each of which extends and tapers radially outwardly of the tire from said bead core, the bead apex elements having a height in a range of from 0.30 to 0.48 times of the tire section height from the bead base-line; wherein the tire has the following relations (1) to (4): wherein “ti