Abstract: A rubber composition has an improved rolling resistance and is based on at least a diene elastomer comprising mainly at least one isoprene elastomer; a reinforcing filler comprising from 15 to 70 phr of carbon black having a BET specific surface area of less than 70 m2/g, and/or a COAN of less than 90 ml/100 g, and from 5 to 20 phr of silica; a salt of an alkaline-earth, alkali or lanthanide metal; and a crosslinking system; in which composition the carbon black to silica ratio is greater than 1.

Abstract: A rubber composition has an improved rolling resistance and is based on at least a diene elastomer comprising mainly at least one isoprene elastomer; a reinforcing filler comprising from 15 to 70 phr of carbon black having a BET specific surface area of less than 70 m2/g, and/or a COAN of less than 90 ml/100 g, and from 5 to 20 phr of silica; a salt of an alkaline-earth, alkali or lanthanide metal; and a crosslinking system; in which composition the carbon black to silica ratio is greater than 1.

Abstract: The invention relates to aA rubber composition has an improved rolling resistance and is based on at least a diene elastomer comprising mainly at least one isoprene elastomer; a reinforcing filler comprising from 10 to 35 phr of carbon black having a BET specific surface area of less than 70 m2/g, and from 10 to 40 phr of silica; a coupling agent in a content corresponding to a range extending from 5 to 15% by weight relative to the weight of silica; and a crosslinking system; in which composition the total content of carbon black and silica is between 20 and 70 phr, and in which the carbon black to silica weight ratio is greater than 0.3.

Abstract: A rubber composition has an improved rolling resistance and is based on at least a diene elastomer comprising mainly at least one isoprene elastomer; a reinforcing filler comprising from 5 to 60 phr of carbon black having a BET specific surface area of less than 70 m2/g, termed coarse carbon black, and from 10 to 30 phr of carbon black having a BET specific surface area of greater than or equal to 70 m2/g, termed fine carbon black; a salt of an alkali, alkaline-earth or lanthanide metal; and a crosslinking system.