Patent ID: 9375982
Filing Date: 2016-06-28
CPC Classification: B60C

Claim Text:
1. A motorcycle tire for running on rough terrain comprising a tread portion provided with a plurality of blocks defining a block pattern, the blocks including center blocks whose centroids of their top surfaces are disposed within a center region of the tread portion defined as being centered on the tire equator and having a developed width of 25% of a developed tread width, wherein the top surface of each of the center blocks is provided with an axially extending edge which extends straight and parallel with the tire axial direction on its each side in the tire circumferential direction, and a pair of arc edges which are curved convexly toward the centroid of the top surface and disposed on both sides of the axially extending edge in the tire axial direction; shoulder blocks whose centroids of their top surfaces are within shoulder regions defined as extending toward the tire equator from the respective tread edges and each having a developed width of 12.5% of the developed tread width, wherein the top surface of each of the shoulder blocks is provided with a pair of axially extending edges which extend straight and parallel with the tire axial direction on its both sides in the tire circumferential direction, an axially outside circumferentially extending edge which extends straight and parallel with the tire circumferential direction between the axially outer ends of the axially extending edges, an axially inside circumferentially extending edge which extends straight and parallel with the tire circumferential direction on its tire equator side; and a pair of arc edges which are curved convexly toward the centroid on both sides of the axially inside circumferentially extending edge in the tire circumferential direction; and middle blocks whose centroids of their top surfaces are within middle regions of the tread portion defined between the center region and the shoulder regions, wherein the top surface of each of the middle blocks is provided with an axially inside circumferentially extending edge which extends straight and parallel with the tire circumferential direction on its tire equator side, an axially outside circumferentially extending edge which extends straight and parallel with the tire circumferential direction on its axially outside a pair of axially extending edges which extend straight and parallel with the tire axial direction on its both sides in the tire circumferential direction, a pair of arc edges which are curved convexly toward the centroid on both sides of the axially inside circumferentially extending edge in the tire circumferential direction, and a pair of oblique edges extending straight and obliquely with respect to the tire circumferential direction on both sides of the axially outside circumferentially extending edge in the tire circumferential direction.