High and medium performance tyre for vehicles

Tyre for wheels of vehicles comprising:

• a casing structure including a central crown portion and two axially opposite sides terminating in a pair of ribs for the attachment of said tyre to a corresponding rim of a wheel;
• a belt structure coaxially associated with said casing structure;
• a tread band, extended coaxially around said belt structure, moulded with a relief pattern comprising:
• a central zone (E), straddling the equatorial plane (Y-Y) of said tyre and extending between two central planes (a-a) substantially parallel to said equatorial plane;
• two intermediate zones (F), each of which extending between one side of said central zone (E) and an intermediate plane (b-b) substantially parallel to said equatorial plane (Y-Y);
• two shoulder zones (G), each of which extending between the axially outermost side of one of said intermediate zones (F) and an axially external plane (c-c), substantially parallel to said equatorial plane (Y-Y) and located in correspondence with the side edge of said tread band, said intermediate (F) and shoulder (G) zones comprising a plurality of transversal grooves,
• characterized in that each intermediate zone (F) comprises two sequences of pairs of transversal grooves, first and second sequence respectively, the pairs of said first sequence being consecutively alternated over the entire circumferential length of the tyre with the pairs of said second sequence, each pair comprising two distinct grooves at least partly parallel, the grooves of each pair of said first sequence being inclined at a predetermined angle (α) to the grooves of each pair of said second sequence, said grooves of said first sequence departing from axially opposite ends of said intermediate zones and terminating with ends inside the latter with respect to the grooves of said second sequence, said internal ends of a pair of a given sequence being at a predetermined distance from the groove of the pair of the other sequence nearest to said ends, said predetermined distance giving rise circumferentially to a continuous, zigzagging rib from which continuous oblique portions, each delimited by the grooves of one of said pairs, depart alternatively from opposite ends.