| abstract |
A radial tyre comprising a carcass layer (6) having a plurality of cords aligned in a substantially radial direction that extend from the tread portion (2) through a sidewall portion (3) to the bead core (5) in each of a pair of bead portions (4) around which it is folded or turned up from the inside to the outside of the tyre and fixed in position, a breaker (9) positioned radially outwardly of said carcass layer (6), and a band (10) positioned radially outwards of said breaker (9) and radially inwards of the annular tread (2), characterised in that the breaker (9) comprises at least two cut breaker plies of cords comprising aromatic polyamide fibre, wholly aromatic polyester fibre, polyvinyl alcohol fibre having a strength of at least 15 g/d, carbon fibre or glass fibre, each cord forming an angle of from 10 to 30 degrees to the circumferential direction of the tyre, and the cords, in each breaker ply being positioned to cross the cords in an adjacent ply, and the band (10) comprises a ribbon of one or more composite cords aligned parallel to one another wound in a continuous spiral form, said composite cords having a strength of not more than 2.5 g/d at 3% extension and an extension of not more than 8% upon application of a load (strength) of 6 g/d, and being prepared by twisting high-modulus filaments and low-modulus filaments into two cords which then are back-twisted together, and each of said cords forming an angle of 0 to 3 degrees with the circumferential direction of the tyre. |