Patent ID: 8517070

Claim:
A pneumatic tyre comprising a tread comprising a central portion disposed astride an equatorial plane and two shoulder portions, the central portion being separated from the shoulder portions of the tread by two circumferential grooves; said central portion comprising at least one circumferential row between two circumferential grooves wherein said tread has a hollow/solid ratio less than 0.28; said circumferential row comprises transverse grooves extending over at least 80% of the width of said circumferential row; each transverse groove comprises a median line having at least one first rectilinear stretch and one curvilinear stretch; said transverse grooves having a smaller width than that of the circumferential grooves; wherein the equatorial plane divides the tread into two half-regions, an axially internal half-region and an axially external half-region positioned on an outer side of a car, when said tyre is mounted thereon, said axially external half-region has a hollow/solid ratio less than that of the axially internal half-region, and said axially internal half-region has a hollow/solid ratio less than or equal to 0.28.