US Patent 7290579 Pneumatic tire for motorcycle

This invention relates to a pneumatic tire for a motorcycle improving a cornering stability, and more particularly to a pneumatic tire for a motorcycle comprising a pair of bead portions 2, a carcass 1 wound around a bead core 3 embedded in the respective bead portion, a tread portion arranged on an outside of a crown portion of the carcass and a pair of sidewall portions extending inward from both ends of the tread portion in a radial direction of the tire, in which the bead core 3 is a cable bead and a geometric second moment coefficient Σ(π/64×d4) of the bead core 3 (wherein d is a diameter of each filament constituting the bead core) satisfies an equation of 0.50<Σ(π/64×d4)<1.50.