Rubber composition and truck and bus tires for trucks and bus tire

摘要

PROBLEM TO BE SOLVED: To provide a rubber composition for truck and bus tires, which can improve low fuel consumption, abrasion resistance and rubber strength in good balance and a truck and bus tire made by using the same.SOLUTION: A rubber composition for truck and bus tires includes a rubber component and silica in which the content of a conjugated diene-based polymer that has a constituent unit based on a conjugated diene and a constituent unit based on a substituent-containing vinylsilane and has at least one end of the polymer modified by a specific compound is ≥5 mass% in 100 mass% of the rubber component, the silica has an average length Wbetween branched particles Z-Z containing branched particles Z of 30-400 nm when three or more particles being particles adjacent to one particle are defined as the branched particles Z and the content of the silica is 5-150 pts.mass with respect to 100 pts.mass of the rubber component.