| CPC B60C 11/1392 (2013.01) [B60C 11/0302 (2013.01); B60C 11/032 (2013.01); B60C 2011/0376 (2013.01); B60C 2011/0381 (2013.01); B60C 2200/10 (2013.01)] | 17 Claims |
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1. A motorcycle tire comprising a tread portion, wherein
the tread portion includes a first tread edge, a second tread edge, and a ground contact surface defined between the first tread edge and the second tread edge,
the ground contact surface is curved in an arc shape so as to be convex outward in a tire radial direction,
the ground contact surface includes a central region and a first outer region,
the central region is configured to contact a ground during straight running with zero camber angle, and includes a first outer edge in a tire axial direction located on the first tread edge side and a second outer edge in the tire axial direction located on the second tread edge side,
the first outer region is defined on the first tread edge side of the first outer edge of the central region,
the ground contact surface is provided with a plurality of oblique grooves each including a portion inclined with respect to a tire circumferential direction,
each of the oblique grooves extends across the central region and the first outer region,
each of the oblique grooves includes a vertical groove portion extending at an angle of 20 degrees or less with respect to the tire circumferential direction,
at least a part of the vertical groove portion is located in the central region,
a minimum distance in the tire axial direction along the ground contact surface between the vertical groove portion and the first outer edge of the central region is 30% or less of a maximum width in the tire axial direction of the central region along the ground contact surface,
in each of the oblique grooves, the vertical groove portion has a length of 10% or more and 20% or less of a total length of the each of the oblique grooves,
the oblique grooves are spaced apart from each other and each not connected with the first tread edge, a tire equator, and other grooves or sipes,
each of the oblique grooves is inclined to one side with respect to the tire circumferential direction from one end to the other end thereof in the tire circumferential direction except the vertical groove portion thereof,
the vertical groove portions are inclined to the one side or extend in parallel with the tire circumferential direction, and
each of the oblique grooves includes an inner groove portion arranged axially inside the vertical groove portion,
the inner groove portion has a maximum angle larger than the angle of the vertical groove portion with respect to the tire circumferential direction,
the oblique grooves include first oblique grooves and second oblique grooves,
the angle of the vertical groove portion of each of the first oblique grooves is less than 5 degrees,
the angle of the vertical groove portion of each of the second oblique grooves is 5 degrees or more, and
the number of the first oblique grooves is greater than the number of the second oblique grooves over an entire circumference of the motorcycle tire.
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