Studless winter tire

Abstract

Provided is a studless winter tire which provides good performance on ice and snow and good abrasion resistance, and suffers little change in hardness and little discoloration on the tire surface. The present invention relates to a studless winter tire including a tread formed from a rubber composition containing a predetermined amount of a farnesene resin obtained by polymerizing farnesene. The present invention relates to a studless winter tire including a tread formed from a rubber composition containing a predetermined amount of at least one myrcene resin selected from the group consisting of myrcene polymers with a Mw of 1,000-500,000, myrcene-butadiene copolymers with a Mw of 1,000-500,000, and myrcene-styrene copolymers with a Mw of 1,000-150,000; and a predetermined amount of a silica with an N 2 SA of 40-400 m 2 /g, the rubber component containing a predetermined amount of a high-cis polybutadiene with a cis content of 95% by mass or more.

1 . A studless winter tire, comprising
 a tread formed from a rubber composition,   the rubber composition comprising, per 100 parts by mass of a rubber component:   1 to 50 parts by mass of at least one myrcene resin selected from the group consisting of myrcene polymers having a weight average molecular weight of 1,000 to 500,000, myrcene-butadiene copolymers having a weight average molecular weight of 1,000 to 500,000, and myrcene-styrene copolymers having a weight average molecular weight of 1,000 to 150,000; and   10 to 150 parts by mass of a silica having a nitrogen adsorption specific surface area of 40 to 400 m 2 /g, and   the rubber component comprising, based on 100% by mass of the rubber component, 15 to 65% by mass of a high-cis polybutadiene having a cis content of 95% by mass or more.