| 摘要 |
A pneumatic tire (10) has first and second carcass reinforcing structures (23), (24), the first structure (23) passing from the tire crown region first to the axially inner surface of bead cores (20), (21), and then on around the cores and the second structure (24) passing from the crown region first to the axially outer surface of the bead cores and then on around the cores, in the as-cured state of the tire the neutral contour of bead and side wall regions of each structure (23), (24) coinciding with a natural equilibrium curve of the respective structure. Each structure (23), (24) may consist of one or more plies whose cords may be at 75 DEG -90 DEG to the circumferential, and the tire may have a crown reinforcement with cords at 15 DEG -30 DEG to the circumferential. The beads may have reinforcements (31), (34) which are made of rubber with a dynamic modulus of at least 125 kg/cm<2> and whose radially outer extremities are at a distance A from the type bead heals of at least 25% of the tyre section height CSH. <IMAGE> |
