{
  "$type": "site.standard.document",
  "description": "Provided is a pneumatic tire which has excellent durability and in which sufficient achievement of both improvement in low fuel consumption performance and reduction in road noise has been realized. The pneumatic tire includes: a tread portion having a tread rubber forming an outer surface; and…",
  "path": "/patents/1409680",
  "publishedAt": "2023-09-13T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60C1/0016",
    "SUMITOMO RUBBER IND [JP]"
  ],
  "textContent": "Provided is a pneumatic tire which has excellent durability and in which sufficient achievement of both improvement in low fuel consumption performance and reduction in road noise has been realized. The pneumatic tire includes: a tread portion having a tread rubber forming an outer surface; and sidewall portions each having a sidewall rubber forming an outer surface. The tread rubber includes: a cap rubber having an outer surface portion on which a ground contact surface is formed by forming a plurality of circumferential groove portions and a plurality of circumferential land portions; and a base rubber disposed inward of the cap rubber in a tire radial direction so as to extend to each sidewall portion. In the ground contact surface, an area formed by the circumferential groove portions is 15 to 30% of a total ground contact area. A loss tangent (tanδb) of the base rubber and a loss tangent (tanδs) of the sidewall rubber which are measured under a condition of a temperature of 30°C, a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain of 1% with a deformation mode being a tension mode, satisfy (tanδb/tanδs)",
  "title": "PNEUMATIC TIRE"
}