An off-road motorcycle tire having a block pattern comprising a plurality of blocks 11 defined by tread grooves 10, each block 11 having a circumferential profile 16 of top surface 12 in the form of a straight line or a circular arc having a radius Ra of curvature of at least 500 mm, in which the circumferential profile denotes a profile in the circumferential section which passes through the centroid G of the top surface 12 and is parallel to the tire equatorial plane Cc. According to the invention, the ground contact pressure at the periphery of the top surface of blocks 11 is prevented from lowering to enhance the edge effect.