A tire rubber composition, comprising: (a) at least one rubbery polymer comprising (i) 10 to 100 weight percent of monomer units derived from conjugated diene monomer having between 4 and 8 carbon atoms; (ii) 0 to 90 weight percent of monomer units derived from vinyl aromatic monomer; (b) 0.5 to 100 phr of silica filler; (c) 0.05 to 20 phr of a bi-functional silica coupling agent; and (d) 1 to 30 phr of a non-elastomer reactive filler reinforcing agent capable of interacting with at least two silica particles and having the formula G where G is a separating group selected from the group consisting of C 1 -C 50 straight chain and branched alkyl, C 2 -C 50 straight chain and branched alkenyl, C 6 -C 50 aromatics, each optionally containing a heteroatom selected from the group consisting of one or more 0, one or more N, and combinations thereof and Y and Z can be the same or different and each independently comprise a silica-reactive group of the formula Si(R 1) p (OR 2) 3-p where each R 1 independently comprises C 1 -C 20 aliphatic, cycloaliphatic or aromatic, R 2 is C 1 -C 6 aliphatic or cycloaliphatic and p is an integer from 0 to 2; and where the bi-functional silica coupling agent and the filler reinforcing agent are utilized in a weight ratio of from 1:100 to 1:0.2, and wherein the non-elastomer reinforcing agent does not contain any sulfur. (a) at least one rubbery polymer comprising (i) 10 to 100 weight percent of monomer units derived from conjugated diene monomer having between 4 and 8 carbon atoms; (ii) 0 to 90 weight percent of monomer units derived from vinyl aromatic monomer; (i) 10 to 100 weight percent of monomer units derived from conjugated diene monomer having between 4 and 8 carbon atoms; (ii) 0 to 90 weight percent of monomer units derived from vinyl aromatic monomer; (b) 0.5 to 100 phr of silica filler; (c) 0.05 to 20 phr of a bi-functional silica coupling agent; and (d) 1 to 30 phr of a non-elastomer reactive filler reinforcing agent capable of interacting with at least two silica particles and having the formula G where G is a separating group selected from the group consisting of C 1 -C 50 straight chain and branched alkyl, C 2 -C 50 straight chain and branched alkenyl, C 6 -C 50 aromatics, each optionally containing a heteroatom selected from the group consisting of one or more 0, one or more N, and combinations thereof and Y and Z can be the same or different and each independently comprise a silica-reactive group of the formula Si(R 1) p (OR 2) 3-p where each R 1 independently comprises C 1 -C 20 aliphatic, cycloaliphatic or aromatic, R 2 is C 1 -C 6 aliphatic or cycloaliphatic and p is an integer from 0 to 2; and where the bi-functional silica coupling agent and the filler reinforcing agent are utilized in a weight ratio of from 1:100 to 1:0.2, and wherein the non-elastomer reinforcing agent does not contain any sulfur. where G is a separating group selected from the group consisting of C 1 -C 50 straight chain and branched alkyl, C 2 -C 50 straight chain and branched alkenyl, C 6 -C 50 aromatics, each optionally containing a heteroatom selected from the group consisting of one or more 0, one or more N, and combinations thereof and Y and Z can be the same or different and each independently comprise a silica-reactive group of the formula Si(R 1) p (OR 2) 3-p where each R 1 independently comprises C 1 -C 20 aliphatic, cycloaliphatic or aromatic, R 2 is C 1 -C 6 aliphatic or cycloaliphatic and p is an integer from 0 to 2; and where the bi-functional silica coupling agent and the filler reinforcing agent are utilized in a weight ratio of from 1:100 to 1:0.2, and wherein the non-elastomer reinforcing agent does not contain any sulfur.