Motorcycle tire for rough terrain

摘要

A motorcycle tire 1 on rough terrain. Blocks 11 include crown blocks 16 arranged in a center area Cr of a tread portion 2, middle blocks arranged axially outside the crown blocks and shoulder blocks arranged axially outside middle blocks. The crown blocks have a smallest aspect ratio. The shoulder blocks have a largest aspect ratio. The crown block 16 includes a shift block. The shift block is provided in a center part in its widthwise direction with one circumferentially extending slit so as to divide the block into two small block segments. The two small block segments are shifted from each other in the tire circumferential direction.

主权项

1. A motorcycle tire for rough terrain comprising a tread portion provided with a plurality of blocks, said blocks including:
crown blocks arranged in a center area of the tread portion, middle blocks arranged axially outside the crown blocks, shoulder blocks arranged axially outside middle blocks, and parallel blocks arranged between the crown blocks, each parallel block including one circumferentially extending slit that divides each parallel block into two small block segments which are not shifted from each other in the tire circumferential direction, wherein the crown block aspect ratio is smallest and the shoulder block aspect ratio is largest among the blocks, the block aspect ratio being defined as a ratio (L/W) of the circumferential length L to the axial width W of the block, the crown blocks each include one circumferentially extending slit that divides each block into two small block segments, the slit having a groove depth in a range of from 5% to 40% of the radial height of the crown block, the two small block segments are shifted in opposite directions from each other in the tire circumferential direction, and the number of crown blocks is 66.7% to 90% of the total number of crown blocks and parallel blocks.