The tread pattern's continuous ribs enhance the tire's road contact, which in turn boosts the steering responsiveness and driving stability. In this manner, the steering becomes faster and more precise in its responsiveness to the driver's commands, while the structure is stabilized against the high speed driving pressure. The special shoulder pattern upgrades the cornering and maneuvering capability. The closed pattern heightens the number of biting edges with the larger road contact area. The directional tread design improves the high speed performance with the even pressure distribution, which ensures a stable and secure high speed performance.