Patent ID: 11865871
Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A tire comprising: a tread portion having a pair of tread edges, and provided with four circumferential grooves continuously extending in the tire circumferential direction to axially divide the tread portion into five annular land regions, wherein the five annular land regions are a pair of shoulder land regions including the tread edges, respectively, a pair of middle land regions adjacent to the shoulder land regions, respectively, and a crown land region between the middle land regions, the four circumferential grooves are a pair of shoulder circumferential grooves, each disposed between the axially adjacent shoulder land region and middle land region, and a pair of crown circumferential grooves disposed between the shoulder circumferential grooves, each of the middle land regions is provided with a middle circumferential sipe extending continuously in the tire circumferential direction, and a plurality of middle lateral sipes extending across the entire axial width of the middle land region, each of the middle land regions has no groove having a width greater than 1.5 mm, the crown land region has no groove having a width greater than 1.5 mm, each of the shoulder land regions is provided with a plurality of shoulder lateral grooves extending from the adjacent shoulder circumferential groove to the adjacent tread edge, and a plurality of shoulder lateral sipes extending from the adjacent shoulder circumferential groove and terminated within the shoulder land region without reaching the adjacent tread edge, the number of the shoulder lateral sipes in each of the shoulder land regions is the same as the number of the middle lateral sipes in each of the middle land regions, and in every two of the axially adjacent middle land region and the shoulder land region, each of the middle lateral sipes and one of the shoulder lateral sipes extend within a zone whose width is not more than 8.0 mm, the crown land region is provided with a plurality of crown lateral sipes extending across the entire axial width of the crown land region, so that in the tire circumferential direction, circumferential extents of the respective crown lateral sipes do not overlap with circumferential extents of the respective middle lateral sipes, and the middle lateral sipes in the middle land regions are inclined to one side in the tire circumferential direction from one of the tread edges toward the other of the tread edges, whereas the crown lateral sipes are inclined to the other side in the tire circumferential direction from the one of the tread edges toward the other of the tread edges.