Patent ID: 7654295
Filing Date: 2010-02-02
Classification: B60C,Y10T

Abstract:
1. A tire for a motorcycle comprising a tread having an external surface to form a tread surface, a maximum tire width between ends of the tread, a pair of sidewalls extended almost inward in a radial direction from an end of the tread, a pair of bead cores positioned on an inside in the radial direction of the sidewalls, and a carcass laid between both of the bead cores along insides of the tread and the sidewalls, wherein the carcass includes a carcass ply, the carcass ply is turned up around the bead core, the sidewall has a lower layer positioned on an outside in an axial direction of the carcass ply and an upper layer positioned on an outside in the radial direction of the lower layer, the upper layer has a hardness which is equal to or higher than 50 and is equal to or lower than 70, the lower layer has a hardness which is equal to or higher than 70 and is equal to or lower than 100, when a height in the radial direction from a bead base line to the end of the tread is represented by HT, a height in the radial direction from the bead base line to a lower end of the upper layer is represented by HU and a height in the radial direction from the bead base line to an upper end of the lower layer is represented by HL, a ratio of the height HU to the height HT is equal to or higher than 10% and is equal to or lower than 30%, and a ratio of the height HL to the height HT is equal to or higher than 50% and is equal to or lower than 70%, and in a straight line passing through a position in which a height in the radial direction from the lower end of the upper layer to the upper end of the lower layer is a half and extended in the axial direction, a ratio of a thickness of the lower layer to that of the upper layer is equal to or higher than 50% and is equal to or lower than 70%.