A particulate-filled rubber composition comprising: (i) at least one vulcanizable rubber; (ii) at least one silane-reactive particulate filler; (iii) at least one blocked mercaptosilane possessing two thioacyl groups, the blocked mercaptosilane having the formula: [R 1 C(=O)S(CH 2) n -] 2 G-R 2 SiX 1 X 2 X 3; and, (iv) at least one blocked mercaptosilane possessing a single thioacyl group, the blocked mercaptosilane having the formula: R 3 C(=O)SR 4 SiX 1 X 2 X 3, wherein R 1, each occurrence, is independently hydrogen or a monovalent hydrocarbon group containing up to 12 carbon atoms; R 2 is a divalent hydrocarbon group containing up to 10 carbon atoms and, optionally, an oxygen atom or sulfur atom; R 3 is hydrogen or a monovalent hydrocarbon group containing up to 18 carbon atoms; R 4 is a divalent hydrocarbon group containing up to 12 carbon atoms; G is a trivalent cyclic hydrocarbon group containing up to 10 carbon atoms; X 1, each occurrence, is independently selected from the group consisting of R 5 O- and R 5 C(=O)O-, wherein R 5 is hydrogen or a monovalent hydrocarbon group containing up to 18 carbon atoms and, optionally, at least one oxygen atom; X 2 and X 3, each occurrence, is independently chosen from the group consisting of the members listed for R 6 and X 1, wherein R 6 is a monovalent hydrocarbon group of up to 6 carbon atoms; and, n is an integer from 1 to 5. (i) at least one vulcanizable rubber; (ii) at least one silane-reactive particulate filler; (iii) at least one blocked mercaptosilane possessing two thioacyl groups, the blocked mercaptosilane having the formula: [R 1 C(=O)S(CH 2) n -] 2 G-R 2 SiX 1 X 2 X 3; and, (iv) at least one blocked mercaptosilane possessing a single thioacyl group, the blocked mercaptosilane having the formula: R 3 C(=O)SR 4 SiX 1 X 2 X 3, wherein R 1, each occurrence, is independently hydrogen or a monovalent hydrocarbon group containing up to 12 carbon atoms; R 2 is a divalent hydrocarbon group containing up to 10 carbon atoms and, optionally, an oxygen atom or sulfur atom; R 3 is hydrogen or a monovalent hydrocarbon group containing up to 18 carbon atoms; R 4 is a divalent hydrocarbon group containing up to 12 carbon atoms; G is a trivalent cyclic hydrocarbon group containing up to 10 carbon atoms; X 1, each occurrence, is independently selected from the group consisting of R 5 O- and R 5 C(=O)O-, wherein R 5 is hydrogen or a monovalent hydrocarbon group containing up to 18 carbon atoms and, optionally, at least one oxygen atom; X 2 and X 3, each occurrence, is independently chosen from the group consisting of the members listed for R 6 and X 1, wherein R 6 is a monovalent hydrocarbon group of up to 6 carbon atoms; and, n is an integer from 1 to 5. R 1, each occurrence, is independently hydrogen or a monovalent hydrocarbon group containing up to 12 carbon atoms; R 2 is a divalent hydrocarbon group containing up to 10 carbon atoms and, optionally, an oxygen atom or sulfur atom; R 3 is hydrogen or a monovalent hydrocarbon group containing up to 18 carbon atoms; R 4 is a divalent hydrocarbon group containing up to 12 carbon atoms; G is a trivalent cyclic hydrocarbon group containing up to 10 carbon atoms; X 1, each occurrence, is independently selected from the group consisting of R 5 O- and R 5 C(=O)O-, wherein R 5 is hydrogen or a monovalent hydrocarbon group containing up to 18 carbon atoms and, optionally, at least one oxygen atom; X 2 and X 3, each occurrence, is independently chosen from the group consisting of the members listed for R 6 and X 1, wherein R 6 is a monovalent hydrocarbon group of up to 6 carbon atoms; and, n is an integer from 1 to 5.