PNEUMÁTICO

A pneumatic tyre (1) for car having a tread (2) comprising a central portion (L1) disposed astride an equatorial plane (7) and two shoulder portions (8, 12). The central portion (L1) is separated from the tread shoulder portions (8, 12) by two circumferential grooves (3, 6); at least one circumferential row (9) included between a first and a second circumferential groove (3, 4) is present in the central portion (L1) . The tread (2) has a hollow/solid ratio lower than 0.28. The circumferential row (9) comprises transverse grooves (16) extending from a circumferential groove (3) to the axially adjacent one (4). Each transverse groove (16) comprises a median line having at least one first rectilinear stretch (106; 107) and one curvilinear stretch (108). The transverse grooves (16) have a smaller width than that of the circumferential grooves (3; 4).