Abstract: The invention relates to a rubber composition based on an elastomeric matrix comprising at least 90 phr of at least one isoprene elastomer, on a reinforcing filler predominantly comprising at least one carbon black, known as CB black, exhibiting a BET specific surface at most equal to 30 m2/g and an oil absorption index of compressed sample (COAN) at least equal to 60 ml/100 g, and on a crosslinking system, the said composition not comprising, or comprising at most 10 phr of, carbon black, the BET specific surface of which is greater than 30 m2/g and the COAN of which is greater than 40 ml/100 g, and not comprising, or comprising at most 10 phr of, silica.