| 摘要 |
<p>A pneumatic radial tire having a structure where the lapel edge of the carcass is tucked under a belt layer and exhibiting high durability and steering stability can be easily produced using a carcass material of an existing size without preparing an ultra-wide carcass material. Two layers of carcasses (A, B) are extended from a tread portion (1) to a bead portion (3) via right and left sidewall portions (2), and the opposite ends thereof are turned down from the inside of the tire to the outside around right and left bead cores (4, 4). A belt layer (6) is arranged on the outer circumferential side of the carcasses (A, B) and the overall width of the carcasses (A, B) in the tire width direction is essentially equal and the carcasses (A, B) are offset in opposite directions in the tire width direction. The turn back lengths from the right and left bead cores (4, 4) at the opposite ends of the carcasses (A, B) are made different, the carcass with shorter turn back length is terminated in the vicinity of the bead core (4), and the carcass of longer turn back length is extended to the inside of the belt layer and portion (6e) in the tire width direction and is terminated thereat.</p> |
