Tread pattern of an off-road motorcycle tire

A motorcycle tire for running on rough terrain has a block pattern formed by blocks which include 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 the four blocks are each 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 (¸1a) of straight lines drawn between the 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 each other with a tie bar, 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.