| 摘要 |
PURPOSE:To provide even a flat having small conicity and few stray in travelling by providing a recess forming a circulmferential groove deviated in a region regulated for the circumferential groove in a low tread rubber forming a tire tread. CONSTITUTION:In a distance RW from the equator surface CO of a metal mold, a projecting streak width GW of projecting streak 9 in the axial direction of a tire, a distance rw1 from the center line to the center line side edge of a recess 12 above the center line of a low tread rubber 11, a distance rw2 from the center line to the centerline side edge of a recess 13 below the center line and a groove width gw of the upper and lower recesses 12, 13 in the direction orthogonal to the center line, the average value, 1/2(rw1+rw2), of distances of the low tread rubber 11 is set to the distance RW of the projecting streak 9 of a vulcanization metal mold 4 minus 1/2 times the projecting streak width GW; (RW-1/2XGW) or more and the sum (RW+GW) or less of the distance RW of the vulcanization metal mold 4 and the projecting streak width GW. The dimensional difference between the respective distances rw1, rw2 of the low tread rubber 11 is set larger than 0 and to 6mm or less. |
