Patent ID: 6070631
Filing Date: 2000-06-06
Classification: B60C,Y10S,Y10T

Abstract:
A tire for two-wheeled vehicles having a curvature ratio not lower than 0.3, comprising:a carcass structure (2) of toric form having a high transverse curvature and provided with a central crown portion (16) and two sidewalls ending in a couple of beads (15) for anchoring on a corresponding mounting rim;a belt structure (6), circumferentially inextensible, coaxially extended around the carcass structure (2);a tread band (8) coaxially extended around the belt structure (6) and comprising a plurality of rubber blocks (10) defined between a plurality of grooves (11) extending along a direction substantially transverse to the running direction of the tire, said tread band (8) being free from any groove extending along a direction substantially parallel to the running direction of the tire, said grooves (11) comprising a bottom (12) connected to opposite inlet (13) and outlet (14) sidewalls extending substantially perpendicularly to said bottom (12) such that said sidewalls (13, 14) form with respect to a plane perpendicular to said bottom (12) an angle varying from 0.degree. to 40.degree.;wherein:a) said belt structure (6) comprises at least a radially external layer (9a) including a plurality of circumferential coils (7a), axially arranged side by side, of a cord (7) wound at a substantially zero angle with respect to the equatorial plane (X--X) of the tire;b) the area occupied by said rubber blocks (10) in a portion of the tread band (8) having a length equal to a pitch (p) of the tread pattern and a width equal to the axial development of the tread band (8) is between 70% and 90% of the total area of said portion; andc) said grooves (11) transversely extend along the tread band (8) according to a curvilinear path substantially parallel to the wear waves of the tread band (8).