To provide a motorcycle pneumatic tire having improved cornering stability by improving bead cores to balance grounding performance in turning with the safety factor of bead portions.

The motorcycle pneumatic tire comprises: a carcass 1 turned around the bead cores 3 embedded in the pair of bead portions 2 and locked thereto; a tread portion arranged on the outer periphery of a crown portion of the carcass 1; and a pair of sidewall portions extending inward from both ends of the tread portion to a tire radial direction. The bead core 3 is a cable bead, and its coefficient of geometrical moment of inertia Σ (π/64×d4), where d is the diameter of filaments constituting the bead core 3, satisfies a following expression: 0.50<Σ(π/64×d4)<1.50.