Patent ID: 8297324
Filing Date: 2012-10-30
Classification: B60C

Abstract:
1. A pneumatic tire for a motorcycle, including a pair of bead portions having bead cores embedded therein, a pair of sidewalls extending on the outer side in the tire radial direction from the bead portions, and a tread portion extending over the respective sidewall portions, wherein the tread portion is constituted of at least four tread regions such that, when the tread regions are viewed in a section in the tire widthwise direction, loss tangent values of rubbers constituting the adjacent tread regions are different from each other, a loss tangent value at 100° C. of a rubber constituting a center tread region as a tread region including the tire equatorial plane, of the tread regions, is smaller than a loss tangent value at 100° C. of each of rubbers constituting other tread regions, the other tread regions include two tread regions interposing the center tread region in the tire widthwise direction and a surface rubber layer provided on the outer side in the tire widthwise direction and the tire radial direction of at least one of the two tread regions by replacing a portion thereof, and the surface layer is formed of rubber having a loss tangent value of 100° C. that is larger than the loss tangent value at 100° C. of the rubber constituting the two tread regions.