| 摘要 |
A pneumatic tyre comprises a carcass ply (6) turned up around a bead core (5) in each bead portion (4) to form a pair of turnup portions (6b) and a main portion (6a) therebetween, and a rubber bead apex (8) disposed between each turnup portion (6b) and main portion (6a). Each turnup portion (6b) extends radially outwardly beyond a radially outer end (8t) of the bead apex (8) to have a part adjoining the main portion. The profile in a tyre sidewall portion (3) and bead portion (4) comprises a first linear portion (S1) and a second linear portion (S2), the first linear portion (S1) extending radially outwards from a point P substantially parallel to the tyre equatorial plane (C), and the second linear portion (S2) extending radially inwards from the point P while inclining axially inwards at an angle (θ2) of from +15 to +60 degrees with respect to the tyre equatorial plane (C). The radial distance of the radially outer end (6c) of the turnup portion (6b) from a point Q is in the range of less than 3 times a distance (gt) measured from the point P to the carcass ply main portion (6a) along a straight line (T) drawn from the point P perpendicularly to the carcass ply main portion (6a), wherein the point Q is defined as a point at which the straight line (T) intersects the carcass ply main portion (6a). <IMAGE> |
