Pneumatic tire

摘要

A pneumatic tire is provided with a tread pattern of left-right asymmetry having an outboard tread edge and an inboard tread edge, and a cap tread rubber having a hardness of from 60 to 75 degrees. An outboard crown land zone defined between middle and outboard main grooves is provided with a circumferentially extending crown sub groove and a crown narrow groove and outboard crown lateral grooves so as to form one row of central crown blocks having an axial width W1, one row of outboard crown blocks having an axial width W2, and one circumferentially extending crown narrow rib having an axial width W3, wherein the axial widths satisfy W1>=W2>=W3.

主权项

1. A pneumatic tire comprising:
a tread portion provided with a tread pattern of left-right asymmetry and having an outboard tread edge and an inboard tread edge, a cap tread rubber having a hardness of from 60 to 75% degrees and disposed in the tread portion to define the tread surface of the tire, said tread pattern comprising a plurality of circumferentially continuously extending main grooves including
a middle main groove whose widthwise center line is located on the inboard tread edge side of the tire equator at a distance of from 2 to 10% of a tread width from the tire equator, and whose groove width is in a range of from 2 to 6 mm, andan outboard main groove whose widthwise center line is located on the outboard tread edge side of the tire equator at a distance of from 15 to 30% of the tread width from the tire equator, and whose groove width is more than that of the middle main groove, wherein
an outboard crown land zone defined between the middle main groove and the outboard main groove is provided witha crown sub groove extending continuously in the tire circumferential direction, positioned on the outboard tread edge side of the tire equator, and having a groove width less than that of the middle main groove,a crown narrow groove extending continuously in the tire circumferential direction, positioned on the outboard tread edge side of the crown sub groove, and having a groove width less than that of the crown sub groove, anda plurality of outboard crown lateral grooves extending from the crown narrow groove to the middle main groove, while inclining to one circumferential direction, whereby in the outboard crown land zone, there are
a row of circumferentially arranged central crown blocks defined by the middle main groove, the crown sub groove and the outboard crown lateral grooves, and having an axial width W1,a row of circumferentially arranged outboard crown blocks defined by the crown sub groove, the crown narrow groove and the outboard crown lateral grooves, and having an axial width W2, anda circumferentially continuously extending crown narrow rib defined between the crown narrow groove and the outboard main groove, and having an axial width W3, wherein
the axial width W2 is equal to or less than the axial width W1, and equal to or more than the axial width W3, andthe outboard main groove has a groove depth D1, the crown narrow groove has a groove depth D2, and the crown sub groove has a groove depth D3, and the groove depth D2 is less than the groove depth D1 and more than the groove depth D3.