| 主权项 |
1. A tire comprising:
a tread portion with a groove portion formed to extend in a tire circumferential direction; a plurality of protrusion portions provided on a groove bottom of the groove portion, each of the protrusion portions extending from one side walls forming the groove portion to the other side wall opposed to the one side wall, the protrusion portions arranged at predetermined intervals in the groove portion, wherein a relationship of 0.75 L≦P≦10 L is satisfied when a length of the protrusion portion along a groove center line passing through a center in a width direction of the groove portion is L, and the predetermined interval is P, in a tread surface view of the tire, further comprising a plurality of belt layers arranged in the tread portion and extending in a tire circumferential direction; a pair of bead cores; and a carcass layer which extends across the pair of the bead cores and has a toroidal shape, wherein the plurality of belt layers including a shortest belt layer whose length in a tread width direction is smallest, a length along the tread width direction from an end of the shortest belt layer in the tread width direction to the groove center line is not more than 200 mm, and each of the plurality of belt layers comprises an inner crossing belt group comprising a set of belt layers and located outside the carcass layer in a tire radical direction, an intermediate crossing belt group comprising another set of the belt layers and located on the outer side of the inner crossing belt group in the tire radical direction, and an outer crossing belt group comprising the still another set of the belt layers and located on the outer side of the intermediate crossing belt group in the tire radical direction, and the inner crossing belt group includes the shortest belt layer. |
