Rubber compositions

A rubber composition, comprising:

• (A) 100 parts by mass of a solid rubber (A);
• (B) 0.1 to 50 parts by mass of a modified liquid diene rubber (B) having a functional group derived from a silane compound represented by the formula (1):
• and
• (C) 20 to 200 parts by mass of a filler (C),
• wherein:
• the modified liquid diene rubber (B) satisfies (i) to (iii) below:
• (i) the weight average molecular weight (Mw) is not less than 1,000 and less than 15,000,
• (ii) the vinyl content is not more than 70 mol %, and
• (iii) the average number of functional groups per molecule of the modified liquid diene rubber (B) is 1 to 20;
• R1 is a C1-6 divalent alkylene group;
• and
• R2, R3 and R4 are each independently a methoxy group, an ethoxy group, a phenoxy group, a methyl group, an ethyl group or a phenyl group, with the proviso that at least one of R2, R3 and R4 is a methoxy group, an ethoxy group or a phenoxy group.