To improve a stability and the grip property of a lateral direction at the camber time and a tread wear at the oversteering time by a big camber angle.

The camber value C/L reinforced by a breaker assembly consisting of two main breaker plies 5, 7 comprising a reinforcement cord has a tread of 0.5-0.7. An additional breaker ply 6 is arranged onto the main breaker plies 5, 7. The additional breaker ply 6 is composed of a central ply part 6C using the cord reinforcement rubber material of the central part and outside ply parts 6L, 6R using the rubber material not having a cord reinforcement adjacent to this central ply part 6C at both edges of an axial direction.