| 摘要 |
PURPOSE: To provide a pneumatic tire capable of reducing the weight increase of the tire while improving a crack resisting property of a land part near the bottom of a lug groove. CONSTITUTION: In a pneumatic tire forming the basic pattern of lug, at least two thin ribs 3 connected to lands 5 on both left and right sides of a lug grove 2 while crossing the groove bottom as projecting continuos lines are provided in parallel or to cross each other at least in a shoulder region of the lug groove 2. Assuming that an average rib width of the respective thin ribs 3 is w, a distance measured in the direction of the meridian of the tire between the outermost end of the thin rib 3 located on the shoulder side and the innermost end of the thin rib 3 located on the tire center side is b, total sum of the distance b and the average width w of all thin ribs 3 isΣw and the length of the respective lug grooves 2 measured in the direction of the meridian of the tire is B, the pneumatic tire has the following relationship; w=(0.05-0.15) B, b=(0.30-0.70) B andΣw=(0.10-0.30) B. |
