| 摘要 |
A pneumatic tire is provided with an improved carcass line which reduces the transmission of vibration during running to reduce the road noise. In a meridian section of tire when mounted on a standard rim but not inflated, the carcass line defined by the thickness center line of the carcass comprises a tread crown part, a pair of upper sidewall parts radially outward of the maximum carcass width position, and a pair of shoulder parts between the tread crown part and the upper sidewall parts. The tread crown part has a first single radius of curvature R1, the upper sidewall parts has a second single radius of curvature R2, and the shoulder parts has a third single radius of curvature R3. The third radius of curvature R3 is in the range of from 0.003 to 0.03 times the first radius of curvature R1, the third radius of curvature R3 is in the range of from 0.05 to 0.5 times the second radius of curvature R2. The axial position of the boundary between the tread crown part and each shoulder part is between the axial position of each edge of the belt and a position which is 20 mm axially inward thereof. |
