{
  "$type": "site.standard.document",
  "description": "To provide a pneumatic tire by which uneven wear resistance can be increased and the formation of cracks and/or fractures in the ribs can be effectively prevented. This pneumatic tire comprises a tread portion, sidewall portions, and bead portions, wherein the tread portion includes five main…",
  "path": "/patents/933683",
  "publishedAt": "2016-12-14T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60C11/04",
    "YOKOHAMA RUBBER CO LTD [JP]"
  ],
  "textContent": "To provide a pneumatic tire by which uneven wear resistance can be increased and the formation of cracks and/or fractures in the ribs can be effectively prevented. This pneumatic tire comprises a tread portion, sidewall portions, and bead portions, wherein the tread portion includes five main grooves extending in the tire circumferential direction that partition six rows of ribs, a plurality of first sipes is formed in each edge portion of center ribs, intermediate ribs, and shoulder ribs, a plurality of first narrow grooves is formed in each of the center ribs and the intermediate ribs so as to form a connection between the main grooves, a plurality of second narrow grooves is formed in each of the center ribs and the intermediate ribs so as to connect the first narrow grooves, an interval Pg 1 of the first narrow groove is from 20 mm to 60 mm, an interval Ps 1 of the first sipe is from 15% to 45% of the interval Pg 1 of the first narrow groove, a ratio Wa/TDW of a width Wa of the center ribs to a tread portion development width TDW is from 0.08 to 0.18, a ratio Wb/TDW of a width Wb of the intermediate ribs to the tread portion development width TDW is from 0.08 to 0.18, and a ratio Wc/Wa of a width Wc of the shoulder ribs to the width Wa of the center ribs is from 1.20 to 1.30.",
  "title": "PNEUMATIC TIRE"
}