| 摘要 |
PURPOSE:To reduce noise caused by the synchronization of impact sound without damaging traction performance by shifting each of the edges of side blocks in the peripheral direction of a tire as a central block row and plural side block rows are regulated under fixed conditions. CONSTITUTION:Edges B2f, B3f on the one side and edges B2r, B3r on the other side of plural side blocks B2, B3 arranged between central blocks B1 are shifted by fixed lengths Rf, Rr in the peripheral direction of a tire respectively. Each of the fixed lengths Rf, Rr is determined to be 0.15-0.5 time as long as each of block lengths LB2, LB3. The minimum widths between the central block B1 and each of the side blocks B2, B3, namely lengths Sf, Sr in the circumferential direction of the tire are determined to be 8-15mm. Each ratio of the block width to the block length, namely each ratio of LB1/WB1-LB3/WB3 is determined to be 1-1.6. On the other hand, the ratio of sea area to land area on a ground surface is determined to be 0.3-0.15. |
