Patent ID: 7204283
Filing Date: 2007-04-17
Classification: B60C,Y10T

Abstract:
1. A pneumatic tire comprising a tread portion, a pair of sidewall portions, and a pair of bead portions, each said bead portion having a bottom face and an axially outer side face which contact with a bead seat and a flange of a standard wheel rim, respectively, when the tire is mounted on the wheel rim, said flange having a radially inner flat portion substantially parallel with an equatorial plane of the tire and a radially outer curved portion extending radially outwards from the radially outer end of said radially inner flat portion while inclining axially outwards, said axially outer side face comprising a radially inner part for contacting with said radially inner flat portion of the rim flange, and a radially outer part for contacting with said radially outer curved portion of the rim flange, wherein said axially outer side face is provided with a profile such that, in a meridian section of the tire, when a bead width Wa of the tire is adjusted to a rim width Wr of the wheel rim without being mounted on the wheel rim, the radially inner part is a substantially straight line parallel with the equatorial plane of the tire, and the radially outer part is (A) a substantially straight line or (B) a convex line or (c) a concave line having a radius of curvature of not less than 300 mm, and the radially outer part extends radially outwards from the radially outer end of the radially inner part while inclining axially outwards, and a height ha of the boundary between the radially outer part and the radially inner part is in a range of from 0.6 to 1.2 times a height hc of the boundary between the radially outer curved portion and the radially inner flat portion of the rim flange.