| 摘要 |
A pneumatic tire (10) comprises a radial ply (13) carcass, a tread portion (27) disposed radially outwardly of the crown region of the carcass and a crown reinforcing structure interposed between the tread portion (27) and the crown region of the carcass. The crown reinforcing structure includes a belt assembly (21) having at least a first (22), radially innermost and a second (23), radially outermost belt ply as well as a textile overlay structure which is superimposed radially outwardly to said belt assembly (21). The textile overlay structure is reinforced with cords (30, 40) being made of materials showing on a homogeneous specimen a Youngs modulus of at least 15,000 MPa; the cords have a twist multiplier comprised between 6 and 14 and at least one of the yarns (31, 32, 41, 42, 43) included in the cords (30, 40) has a twist of at least 14 turns per inch. |
