| 摘要 |
A pneumatic radial ply passenger tire (10) having a tread (20), a casing with two sidewalls (14, 16), one or more radial plies (18) extending from and wrapped about two annular beads (13) and a belt reinforcement structure (15) located radially between the tread and the plies. The tread has a central rib (50) with a first contour-defining curve extending outwards from the centerline of the tire towards the sidewalls and a pair of side ribs (60) each having a second contour-defining curve disposed between the central rib and the sidewalls. The first and second contour-defining curves each have first and second radii disposed such that the meeting point (72) of first and second adjacent contour-defining curves cannot contain a single line that is mutually tangential to the first and second adjacent contour-defining curves. First and second circumferential decoupling grooves (22) are disposed on either side of the centerline at the meeting point of the first and second adjacent contourdefining curves and define a circumferential line at the bottom of the grooves which is a region of greater flexibility than the adjacent sections of the tire tread to decouple sidewall bending stresses from the central rib.
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