Patent ID: 9623708
Date: 2017-04-18
CPC Classifications: B60C

Claim:
1. A pneumatic tire comprising: a tread portion provided with a left-right asymmetric tread pattern comprising three circumferentially continuously extending main grooves which are a central main groove whose widthwise center line is disposed in a tread center region having a width of 20% of a tread width TW of the tread portion and centered on a tire equator, an outboard shoulder main groove, and an inboard shoulder main groove, wherein a width of the outboard shoulder main groove is larger than a width of the central main groove and a width of the inboard shoulder main groove, the outboard shoulder main groove connects to neither a groove nor a sipe, wherein an inboard sloping surface and an outboard sloping surface are formed on both sides of the outboard shoulder main groove, respectively, so that the inboard sloping surface and the outboard sloping surface extend continuously in a tire circumferential direction and extend in an axial direction of the tire from opposite inboard and outboard groove-sidewalls of the outboard shoulder main groove toward both sides of the outboard shoulder main groove and merge into a tread surface of the tread portion, a depth of the inboard sloping surface measured radially at the inboard groove-sidewall from the tread surface is in a range of from 0.02 to 0.5 times a width of the inboard sloping surface, a depth of the outboard sloping surface measured radially at the outboard groove-sidewall from the tread surface is in a range of from 0.02 to 0.5 times a width of the outboard sloping surface, and in a meridian section of the tire, a radius of curvature of the inboard sloping surface is less than a radius of curvature of the outboard sloping surface.