| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable efficiently reduction of a road noise caused by air pole resonance while securing an excellent wet capacity. SOLUTION: A wide vertical main gutter 10 having more than 5% of the gutter width GW of a tread grounding width TW is equipped and a gutter bottom rib 13 stretching continuously is formed on the bottom of Bs of the wide vertical main gutter 10. As to the gutter bottom rib 13, a rib height Hr from the gutter bottom Bs is 0.5-3.0 mm, a rig width Wr is 10 to 30% of the aforesaid gutter width GW, and a concave area 12 like a gutter at a depth of Dr smaller than the rib height Hr is formed on a 13s above the gutter bottom rib 13.</p> |
