| 摘要 |
<p>A radial tyre for a passenger car comprising a carcass layer (6) comprising carcass cords arranged substantially in the radial direction and extending through a tread part (2), side wall parts and wrapped at each edge of the carcass layer (6) around a bead core in each of two beads (3) from the inside to the outside of the tyre, and a belt layer (7) composed of at least two belt plies, each comprising steel cords parallel to each other, arranged radially outside the carcass layer (6), characterised by the tread part (2) comprising a tread rubber (10) having a base rubber layer (10B) arranged outside the belt layer (7), the loss factor tan delta (b) of which is 0.03 to 0.08, and a cap rubber layer (10C) arranged outside the base rubber layer (10B), the loss factor tan delta (c) of which is 0.06 to 0.10 and is larger than the loss factor tan delta (b) of the base rubber layer (10B); the steel cord of the belt ply comprising four or less steel filaments (9); and in a cross section of the tyre including the tyre's axis (00) when the tyre is mounted on its specified rim, the ratio Tr2/Tr1 of the tread radius of curvature Tr1 when inflated to 2% of the specified internal pressure to the tread radius of curvature Tr2 when inflated to the specified internal pressure is 1.0 to 2.0. <IMAGE></p> |
