Motorcycle tire for off-road traveling

摘要

An off-road motorcycle tire 1 having an improved cracking resistance, comprising a tread portion 2 having a plurality of blocks B, wherein at least one of the blocks B has a shallow groove 17 having a depth D1 of 10 to 50% of a height H1 of the blocks B to provide a shallowly-grooved block 16 in which the block is divided into at least two block segments 16s by the shallow groove 17, the shallow groove 17 has both ends opened on outer wall surfaces 12 of the shallowly-grooved block 16 and it has groove wall surfaces 17w extending radially inwardly from a tread surface 11 of the block and a bottom 17b connecting the groove wall surfaces 17w, and intersection portions 18 between the bottom 17b and the outer wall surfaces 12 are chamfered to form chamfered portions 19 having a convex circular arc-like curved surface.

主权项

1. An off-road motorcycle tire comprising a tread portion having a plurality of blocks defined by tread grooves, wherein:
at least one of said blocks has a shallow groove having a groove depth of 10 to 50% of a height of said blocks to provide a shallowly-grooved block in which the block is divided into at least two block segments by said shallow groove, said shallow groove having both ends opened on outer wall surfaces of said shallowly-grooved block, groove wall surfaces extending radially inwardly from a tread surface of the block which comes into contact with a road, and a bottom connecting said groove wall surfaces, and intersection portions between said bottom and said outer wall surfaces are chamfered to form chamfered portions having a convex arc-like curved surface, wherein said shallowly-grooved block is provided with a notched portion which is formed in at least a part of an intersection portion between the thread surface and the outer wall surfaces and which extends along a profile line of a tread surface.