PNEUMATIC TYPE WITH SUPERIOR UNEVEN-WEAR RESISTANT CHARACTERISTICS

PURPOSE:To prevent heel and toe wear of a heavy-load pneumatic tyre of a bus and so on by arranging a pair of rigidity comparative difference moderating cut grooves, which are separated from a zigzag groove, in specific positions on the middle of each of blocks which are defined by zigzag main grooves and lateral grooves. CONSTITUTION:Each of land parts 2 shaped between main grooves 1 is divided into blocks 4 by lateral grooves 3 having a depth (d) 0.3-0.6 time of the depth of the main grooves. And each pair of rigidity comparative difference moderating cut grooves having a length (r) 0.2-0.4 time of the lateral width (m) of the blocks 4 and a depth (d1) 0.70-1.00 times of the depth (d2) of the main grooves 1 is arranged in the middle part 6 of each of the blocks 4 in such a manner that the spacing (p) therebetween is equal to a distance (n) between adjacent lateral groove 3. The ratio l/m between the height (l) and the width (m) of each of the blocks 4 is set within a range between 1.4 and 2.5 and the ratio g/n between the width (g) of each of the lateral grooves 3 and the distance (n) between the adjacent groove 7 is set also set within a range between 0.5 and 0.7. By such constitution as mentioned above, the heel and toe wear can be prevented.