The rubber composition of claim 12 wherein said carbon black is a carbon black having been treated with at least one alkoxysilane selected from n-octyl triethoxysilane, n-hexadecyl triethoxysilane, dimethyl diethoxysilane, n-octadecyltrimethoxysilane, n-octadecyl triethoxysilane, methyl n-octyl diethoxysilane, trimethoxysilanole, triphenoxysi