Patent ID: 8011403
Filing Date: 2011-09-06
Classification: B60C

Abstract:
1. A pneumatic tire for motorcycle, comprising: a tread portion containing tread rubber having a layered structure including at least one layer; a pair of sidewall portions extending on the inner side in the radial direction and provided continuous with respective side portions of the tread portion; and bead portions provided continuous with the inner peripheral sides of the respective sidewalls, wherein a ground contact region of the tread portion is constituted of five regions consisting of: a center region including the tire equatorial plane; a pair of shoulder regions including ground contact ends of the tread; and a pair of intermediate regions located between the center region and the respective shoulder regions, 100% modulus of a portion forming at least a ground contact surface of intermediate tread rubber provided across the entire part of each intermediate region is set larger than each of 100% modulus of a portion forming at least a ground contact surface of center tread rubber provided across the entire part of the center region and 100% modulus of a portion forming at least a ground contact surface of shoulder tread rubber provided across the entire part of each shoulder region, and a negative ratio in the ground contact region of the tread is set so as to gradually increase from the respective shoulder regions toward the center region, and the negative ratios of the center region, each intermediate region and each shoulder region are set in the ranges of 6-12%, 3-9% and 1-7%, respectively, wherein 100% modulus of the center tread rubber is set larger than 100% modulus of the shoulder tread rubber.