Tyre for two-wheeled vehicle and process for manufacturing the same

A process for manufacturing a tyre for two-wheeled vehicles of the type provided with a transverse-curvature ratio f/C≧0.2 and a height sidewall ratio (H−f)/H≦0.7, comprising:

• manufacturing a carcass structure of substantially toroidal shape, said carcass comprising a central crown portion, two axially opposite shoulder portions, and two axially opposite side portions;
• manufacturing a belt structure of substantially annular shape at a radially external position to the carcass structure, at the central crown portion, the manufacturing of the belt structure comprising manufacturing of at least one belt layer through laying on said carcass structure of a plurality of strip-like elements, each strip-like element comprising reinforcing thread elements disposed parallel to each other along a longitudinal direction of the strip-like element, the manufacturing of said at least one belt layer comprising:
• determining laying angles of the reinforcing elements at one of the shoulder portions αsp and at the equatorial plane αc that are to be obtained on the tyre;
• determining a laying trajectory of the strip-like elements defining, at each point, a laying angle (α) relative to a meridian plane of the carcass structure passing through that point so as to obtain said angles αsp, αc, said laying trajectory being in relationship with a strip-like element laying distance or inter-gap between a last reinforcing element of a strip-like element and a first reinforcing element of a strip-like element subsequently laid in the circumferential direction, said distance varying in a controlled and predetermined manner over at least one section of respective laying trajectories of two strip-like elements subsequently laid in a circumferential direction, and wherein a laying inter-gap between adjacent strip-like elements varies, over at least one section of the respective laying trajectories of two strip-like elements subsequently laid in the circumferential direction, in such a manner as to obtain angles on the one of the shoulder portions and at the equatorial plane of the tyre in which (αsp)−(αc)≧3°;
• and
• laying each strip-like element according to the aforesaid laying trajectory, wherein said laying step takes place in such a manner as to avoid overlapping of ends of the strip-like elements at the shoulder portions.