Tire

A tire comprising a widthwise narrow groove extending with a tire widthwise component on a tread surface, wherein

• the widthwise narrow groove has a center-side narrow groove portion located on the inner side in the tire width direction and a shoulder-side narrow groove portion connected to the outer side of the center-side narrow groove portion in the tire width direction,
• in a cross-sectional view perpendicular to the extending direction of the center-side narrow groove portion, the center-side narrow groove portion is formed, from groove opening side to groove bottom side, in a shape of a continuous series of:
• a narrow section including the groove opening;
• a tapered section where the groove width increases toward the groove bottom;
• a wide straight section extending in the groove depth direction with a constant groove width and having a groove width greater than that of the narrow section;
• and an arc-shaped section including the groove bottom, and
• in a cross-sectional view perpendicular to the extending direction of the shoulder-side narrow groove portion, the shoulder-side narrow groove portion is formed, from groove opening side to groove bottom side, in a shape of a continuous series of:
• a narrow section including the groove opening;
• a tapered section where the groove width increases toward the groove bottom;
• and an arc-shaped section including the groove bottom.