Tyre

A tire comprising:

• a tread portion being provided with at least one circumferential groove extending continuously in a tire circumferential direction,
• the at least one circumferential groove comprising a groove bottom being provided with a plurality of groove bottom protruding portions protruding outwardly in a tire radial direction, and the plurality of groove bottom protruding portions being disposed in only two circumferential rows of the plurality of groove bottom protruding portions that extend in the tire circumferential direction,
• each of the plurality of groove bottom protruding portions comprising
• a first surface portion extending in the tire radial direction and facing a first circumferential direction, and
• a second surface portion arranged on a second circumferential direction opposite to the first circumferential direction and extending at a larger angle with respect to the tire radial direction than that of the first surface portion, wherein
• in each of the plurality of groove bottom protruding portions, the first surface portion is continuous with the second surface portion,
• in each of the plurality of groove bottom protruding portions, an angle between the first surface portion and the second surface portion is an acute angle,
• the groove bottom is provided with flat portions between the plurality of groove bottom protruding portions, and
• the flat portions extend along a ground contacting surface of the tread portion.