Pneumatic tyre

摘要

A pneumatic tyre for a vehicle comprising a carcass ply (4) extending between two bead regions and passing through a tread region (1) which extends between two tread contact edges, a tread region (1) reinforcing breaker (2) radially outwards of the carcass (4) in the tread region (1) and a ground contacting tread surface (10) curved in the axial direction characterised in that the curvature of the outer tread surface (10) when the tyre is mounted on a wheel rim (11) and normally inflated has a continuously decreasing radius from a point P which is at a distance SP in the axial direction from the tyre circumferential centreline (C) equal to 20% of the distance from the tread centre to the adjacent tread contact edge.