Motorcycle tire for running on rough terrain

摘要

A motorcycle tire for running on rough terrain has a block pattern that includes major groups arranged circumferentially of the tire at intervals, and minor groups arranged between the major groups. The major group consists of four blocks arranged axially of the tire and each connected to the next with a tie bar, wherein each is defined as having the centroid of its top surface within a tread center region having a developed width of 60% of a developed tread width, and angles (θ1a) of straight lines drawn between axially adjacent centroids are not more than 10 degrees with respect to the tire axial direction. The minor group consists of two or three blocks connected with a tie bar, and angles of straight lines drawn between axially adjacent centroids of top surfaces of the blocks are 15 to 80 degrees with respect to the tire axial direction.

主权项

1. A motorcycle tire for running on rough terrain comprising:
a tread portion provided with a block pattern defined by blocks, the blocks including major groups arranged circumferentially of the tire at intervals and minor groups between the major groups, wherein each of the major groups consists of four of said blocks arranged axially with respect to the tire and each is connected to the next with a tie bar having a radial height lower than that of the blocks, wherein the four blocks are each defined as having the centroid of its top surface within a center region of the tread portion defined as being centered on the tire equator and having a developed width of 60% of a developed tread width, and angles (θ1a) of straight lines drawn between the axially adjacent centroids are not more than 10 degrees with respect to the tire axial direction, and each of the minor groups consists of two or three of said blocks connected with each other with a tie bar having a radial height lower than that of the blocks, and angles of straight lines drawn between axially adjacent centroids of the top surfaces of the blocks of the minor groups are 15 to 80 degrees with respect to the tire axial direction, and wherein the minor groups include
minor central groups whose blocks each have the centroid of its top surface within the center region of the tread portion, andminor shoulder groups whose blocks each have the centroid of its top surface within a shoulder region of the tread portion outside the center region.