| 摘要 |
A pneumatic tyre has an outer surface provided with a mid-lower sidewall contour S1 and a lower sidewall contour S2, the contour S1 extends radially inwardly from the maximum cross sectional width point P1 of the tyre to a point P2 along a circular arc line E1 having a single radius R1 and the centre on an axial line passing the maximum cross sectional width point P1, the contour S2 extends on the axially inside of the circular arc line E1 from the point P2 to a radially inner point P3, the rubber thickness T measured from the tyre outer surface to the main portion (6A) of a carcass is gradually increased from the point P1 to the point P2. The bead portions (4) are provided between the carcass main portion (6A) and each turnup portion (6B) with a bead apex (8) made of hard rubber tapering radially outwardly to the radially outer end thereof, the carcass turnup portion (6B) extends radially outwardly beyond the radially outer end (8t) of the bead apex (8) to form a parallel part, the parallel part extending radially outwardly from the radially outer end of the bead apex substantially parallel to the carcass main portion (6A), and the length L of the parallel part is in the range of from 0.5 to 5.0 times the maximum-section-width CW of the bead core (5). <IMAGE> |
