Carbon black HAF (N330) was treated with an unsaturated hydroxy organic fatty acid in presence or absence of dicumyl peroxide for the attachment onto carbon black as a flexible-bridge between filler surface and elastomer chain to improve some of its reinforcement behaviours in SBR vulcanizates. The treated black was chracterized and evaluated for its processing behaviour and the level of reinforcement in SBR. It was found that the surface modification with the organic fatty acid resulted in a considerable improvement of processing as well as vulcanizate properties, such as, tensile strength, abrasion resistance and flex crack growth resistance.