Pneumatic tire

A pneumatic tire comprising:

• a tread portion provided with a pair of zigzag crown main grooves disposed parallel with each other extending continuously in the tire circumferential direction, and composed of first oblique segments and second oblique segments arranged alternately in a tire circumferential direction,
• wherein
• the first oblique segments are inclined to one direction with respect to the tire circumferential direction,
• edges of each said first oblique segment extend along a straight line or alternatively a curved axially inwardly convex line in a top view of the first oblique segment, and
• the first oblique segments have a length L1,
• each of the second oblique segments is made up of a first portion and a pair of second portions, wherein
• the first portion is disposed between the second portions and inclined to the same direction as the first oblique segments with respect to the tire circumferential direction,
• the second portions are inclined to opposite direction of the first portion with respect to the tire circumferential direction,
• the first portion has a length L2 in a range from 0.10 to 0.20 times the length L1 of the first oblique segments, and
• the second portions have a length L3 in a range from 0.30 to 0.40 times the length L1 of the first oblique segments,
• wherein
• a center land region defined between the pair of crown main grooves is divided into a plurality of blocks by center transverse grooves respectively connecting between the first oblique segments of one of the crown main grooves and the first oblique segments of other of the crown main grooves,
• the tread portion is further provided with a pair of circumferentially continuously extending shoulder main grooves respectively disposed axially outside the respective crown main grooves,
• the shoulder main grooves are zigzag grooves having zigzag pitches P2 smaller than the crown main groove zigzag pitches P1,
• a pair of shoulder land regions of the tread portion each defined between one of the shoulder main grooves and an adjacent tread edge are each circumferentially divided into shoulder blocks by shoulder transverse grooves extending from said one of the shoulder main grooves to said adjacent tread edge, and
• each of the shoulder transverse grooves is provided in its groove bottom with a tie-bar rising from the groove bottom to connect between the shoulder blocks on both sides of said each of the shoulder transverse grooves.

A pneumatic tire comprising:

• a tread portion provided with a pair of zigzag crown main grooves disposed parallel with each other extending continuously in the tire circumferential direction, and composed of first oblique segments and second oblique segments arranged alternately in a tire circumferential direction,
• wherein
• the first oblique segments are inclined to one direction with respect to the tire circumferential direction,
• edges of each said first oblique segment extend along a straight line or alternatively a curved axially inwardly convex line in a top view of the first oblique segment, and
• the first oblique segments have a length L1,
• each of the second oblique segments is made up of a first portion and a pair of second portions, wherein
• the first portion is disposed between the second portions and inclined to the same direction as the first oblique segments with respect to the tire circumferential direction,
• the second portions are inclined to opposite direction of the first portion with respect to the tire circumferential direction,
• the first portion has a length L2 in a range from 0.10 to 0.20 times the length L1 of the first oblique segments, and
• the second portions have a length L3 in a range from 0.30 to 0.40 times the length L1 of the first oblique segments,
• wherein
• a center land region defined between the pair of crown main grooves is divided into a plurality of blocks by center transverse grooves respectively connecting between the first oblique segments of one of the crown main grooves and the first oblique segments of other of the crown main grooves,
• the tread portion is further provided with a pair of circumferentially continuously extending shoulder main grooves respectively disposed axially outside the respective crown main grooves, and
• the shoulder main grooves are zigzag grooves having zigzag pitches P2 smaller than the crown main groove zigzag pitches P1,
• a pair of shoulder land regions of the tread portion each defined between one of the shoulder main grooves and an adjacent tread edge are each circumferentially divided into shoulder blocks by shoulder transverse grooves extending from said one of the shoulder main grooves to said adjacent tread edge,
• a pair of middle land regions of the tread portion each defined between one of the crown main grooves and adjacent one of the shoulder main grooves are each circumferentially divided into a plurality of middle blocks by middle transverse grooves connecting between said one of the crown main grooves and said adjacent one of the shoulder main grooves, and
• each of the middle transverse grooves is provided in its groove bottom with a tie-bar rising from the groove bottom to connect between the middle blocks on both sides of said each of the middle transverse grooves.