Pneumatic tire

摘要

A pneumatic tire includes a tread portion including a plurality of land portions separated by at least two longitudinal grooves, a plurality of lateral grooves crossing the longitudinal groove to form a block row, at least one block having at least two sipes extending in an axial direction of the tire to divide at least three block-pieces which include an outer piece and an inner piece relatively arranged in circumferentially inner side of the block than the outer piece, wherein the total axial length of whole sipes is in a range of from 100 to 400 times a tread width, the outer piece of the block has a circumferential length larger than that of the inner piece of the block, and a ratio of the circumferential length of the outer piece to the circumferential length of the inner piece is greater than 1.0 and smaller than 3.0.

主权项

1. A pneumatic tire comprising
a tread portion including a plurality of land portions separated by at least two longitudinal grooves extending continuously in a circumferential direction of the tire, a plurality of lateral grooves crossing the longitudinal groove to form a block row which comprises a plurality of blocks arranged in the circumferential direction of the tire, at least one block having at least two sipes extending in an axial direction of the tire to form at least three block-pieces which include an outer piece and an inner piece relatively arranged in circumferentially inner side of the block than the outer piece, said at least one block comprising an axially outermost block and an axially inner block relatively arranged axially inward of the outermost block, wherein the total axial length of whole sipes is in a range of from 100 to 400 times a tread width, the outer piece of the block has a circumferential length larger than that of the inner piece of the block, a ratio of the circumferential length of the outer piece to the circumferential length of the inner piece is greater than 1.0 and smaller than 3.0, and said ratio of the outer most block is smaller than that of the inner block.