A tire tread having at least one groove extending in a circumferential direction of the tread, the groove having a cross-sectional shape including a first groove sidewall wall portion extending radially inwardly from a first, radially outermost groove edge , a second groove sidewall wall portion extending radially inwardly from a second, radially outermost groove edge , the second, radially outermost groove edge being located axially opposite of the first groove edge on the other side of the groove , the first groove sidewall wall portion having a larger length in the radial direction of the tread than the second groove sidewall wall portion , a first arc portion extending radially continuous with the first groove sidewall wall portion and having the same or a smaller radius of curvature than the first groove sidewall wall portion , a second arc portion extending radially continuous with the second groove sidewall wall portion and having a smaller radius of curvature than the second groove sidewall wall portion , and a groove bottom portion extending from the radially innermost point of the first arc portion to the radially innermost point of the second arc portion , the groove bottom portion in cross-section either (i) extends straight from the first arc portion toward the second arc portion while being inclined in a radially inward direction thus extending from the radially innermost point of the first arc portion to the radially innermost point of the second arc portion , wherein the first groove sidewall wall portion is an axially outer groove sidewall wall portion and the second groove sidewall wall portion is an axially inner groove sidewall wall portion with axially inner side meaning the axial side of the groove that is axially closer to the equatorial plane of the tread; or (ii) comprising a circumferentially extending groove bottom groove and a first and a second groove bottom section , the first and second groove bottom section preferably having the same radius of curvature, the first groove bottom section connecting the first arc portion and the groove bottom groove and the second groove bottom section connecting the second arc portion and the groove bottom groove , the groove bottom groove having a radially innermost radius of curvature that is smaller than the radius of curvature of the first and second groove bottom section . (i) extends straight from the first arc portion toward the second arc portion while being inclined in a radially inward direction thus extending from the radially innermost point of the first arc portion to the radially innermost point of the second arc portion , wherein the first groove sidewall wall portion is an axially outer groove sidewall wall portion and the second groove sidewall wall portion is an axially inner groove sidewall wall portion with axially inner side meaning the axial side of the groove that is axially closer to the equatorial plane of the tread; or (ii) comprising a circumferentially extending groove bottom groove and a first and a second groove bottom section , the first and second groove bottom section preferably having the same radius of curvature, the first groove bottom section connecting the first arc portion and the groove bottom groove and the second groove bottom section connecting the second arc portion and the groove bottom groove , the groove bottom groove having a radially innermost radius of curvature that is smaller than the radius of curvature of the first and second groove bottom section . <EOS>