The continuous notched center rib maintains its contact with the road surface at all times. The better road contact ensures a safer steering responsiveness and driving stability. In this manner, the steering becomes faster and more precise in its response to the driver's instructions, while the tire's structure is stabilized against the driving pressure affecting it during the drive. The large shoulder tread blocks upgrade the number of biting edges that firmly grip the road surface and promote a secure cornering ability and power.