Rubber composition for tires and pneumatic tire

A tire for heavy load vehicles, comprising a rubber composition for tires, comprising a rubber component and a hydrocarbon resin,

• the rubber component comprising at least 80% by mass in total of at least one of an isoprene-based rubber, a polybutadiene rubber, or a styrene-butadiene rubber and at least 20% by mass of a polybutadiene rubber,
• the rubber composition further comprising, per 100 parts by mass of the rubber component, 250 parts by mass or less of a reinforcing filler comprising carbon black and silica and 0.2 to 10 parts by mass of a tetrazine compound represented by the following formula (1):
• wherein R1 and R2 may be the same or different and each represent a hydrogen atom, —COOR3 in which R3 represents either a hydrogen atom or an alkyl group, or a C1-C11 monovalent hydrocarbon group optionally containing a heteroatom, and R1 and R2 may each form a salt,
• the rubber composition satisfying the equation:
• Y/X=10 to 30 wherein X and Y denote amounts of the tetrazine compound and the hydrocarbon resin, respectively, per 100 parts by mass of the rubber component,
• wherein
• the amount of the hydrocarbon resin is 40 parts by mass or more per 100 parts by mass of the rubber component,
• wherein the amount of carbon black is 5 to 30 parts by mass per 100 parts by mass of the rubber component, and
• wherein the amount of silica is 30 to 85 parts by mass per 100 parts by mass of the rubber component.