Pneumatic tire for motorcycle

Abstract

Provided is a pneumatic tire for motorcycles that has improved wet grip properties while ensuring steering stability during turning. Disclosed is a pneumatic tire for a motorcycle, comprising, in a tread surface part, a first oblique groove (21) that extends obliquely from the vicinity of the tire equator toward outside in the tire width direction in the same direction as the tire rotating direction, and a short groove (22) arranged on an extended line from an outer end, in the tire width direction, of the first oblique groove, wherein: the outer end, in the tire width direction, of the firstoblique groove is located in the vicinity of a point separated by a distance of one-fourth of the tread width TW from the tire equator toward outside in the width direction; an inner end, in the tirewidth direction, of the short groove is located within a range of from one-fourth to five-sixteenth of the tread width TW from the tire equator toward outside in the width direction; the angle of inclination of the first oblique groove with respect to the tire circumferential direction increases toward the outside in the width direction; and an angle [theta]A formed between a groove wall at the outer end, in the width direction, of the first oblique groove and a direction perpendicular to the tire surface and an angle [theta]B formed between a groove wall at the inner end, in the width direction, of the short groove and a direction perpendicular to the tire surface satisfy the relationship [theta]A>[theta]B.

Description

technical field [0001] The present invention relates to a pneumatic tire for a motorcycle (hereinafter also simply referred to as a "tyre"). Specifically, the present invention relates to a pneumatic tire for a motorcycle involving improvement of a tread portion. Background technique [0002] Unlike four-wheeled vehicles such as passenger cars, trucks, and buses, due to the characteristics of two-wheeled vehicles that turn by tilting the body, pneumatic tires for two-wheeled vehicles have crowns that have a smaller curvature than tires for four-wheeled vehicles The cross-section of the radius is rounder than the tire shape. That is, in a pneumatic tire for a motorcycle, the center portion of the tread mainly contacts the ground when the vehicle is running straight, and the shoulder portion of the tread contacts the ground when the vehicle is turning. [0003] In connection with the characteristics of such pneumatic tires for motorcycles, in the tread pattern of pneumatic ti...

AI Technical Summary

Problems solved by technology

To deal with this, conventionally, the operation of increasing the ratio of grooves in the tread pattern or increasing the low-temperature loss of the tread rubber has been mainly carried out. However, there is a problem that these methods have a large adverse effect on the wear performance.

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