mptes ratio of 1 5 to 2 7 is demonstrated and the conclusions in example 1 are thus verified the recipe and mixing instructions correspond to those in tables 1 and 2 6 4 phr si 69 and 1 5 phr sulfur are employed in reference mixture i the amounts of silane and sulfur of mixtures j to m are shown in table 5 as is the profile of technical values of the rubbers the mixtures are each vulcanized at 165 u00b0 c for 45 minutes the data in table 5 show that at si 216 mptes ratios of 1 5 to 2 7 mixtures j to m outstanding rubber properties are found the low mixture viscosities and long partial vulcanization times ensure a good processability of the mixture the high moduli and in particular the high amplification factor 300 100 suggests a very high filler rubber coupling yield the din abrasion values are favourable and great advantages are to be seen in the low loss factors tan u03b4 60 u00b0 c which correlate with the rolling resistance of a tire tread the low mixture viscosities shore a hardnesses and tan u03b4 60 u00b0 c values of mixtures k to m even allow room for a further increase in filler content which can lead to an improvement in the wet antiskid properties reference mixture n with 4 8 phr si 69 and 0 65 phr sulfur is compared with mixtures o to q which comprise mptms mercaptopropyltrimethoxysilane and mtms methyltrimethoxysilane si 203 or si 216 the recipe is shown in table 6 the mixing instructions are analogous to those in table 2 with the difference that the vulcanization system of the 3rd stage is mixed in cold.