RUBBER COMPOSITION FOR TIRES AND PNEUMATIC TIRE

Provided are a rubber composition for tires that shows a balanced improvement in properties such as fuel economy, processability, heat aging resistance, abrasion resistance, wet-grip performance, performance on snow and ice, and handling stability, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for tires, containing: a highly purified, modified natural rubber having a pH adjusted to 2-7; carbon black and/or a white filler; and a silane coupling agent represented by the following Formula (S1): wherein Rrepresents a monovalent group selected from -Cl, -Br, -OR, -O(O=)CR, -ON=CRR, -ON=CRR, -NRR, and -(OSiRR)(OSiRRR), wherein R, R, and Rare the same as or different from one another and each represent a hydrogen atom or a C1-C18 monovalent hydrocarbon group, and h represents a number whose average value is 1 to 4; Rrepresents R, a hydrogen atom, or a C1-C18 monovalent hydrocarbon group; Rrepresents R, R, a hydrogen atom, or the group: -[O(RO)]- wherein Rrepresents a C1-C18 alkylene group, and j represents an integer of 1 to 4; Rrepresents a C1-C18 divalent hydrocarbon group; Rrepresents a C1-C18 monovalent hydrocarbon group; and x, y, and Z are numbers satisfying the following relationships: x + y + 2z = 3, 0 ≤ x ≤ 3, 0 ≤ y, 2, and 0 ≤ z ≤ 1.