Despite the fact that carbon black is not only the most widely used but also the oldest active filler in rubber compounds and that a huge amount of research work [1] has been carried out to characterize, describe and understand this kind of filler, the reinforcement effect in filler-loaded rubber is not satisfactorily explained. Since carbon black is an essential ingredient of most rubber formulations and has a considerable influence on the performance of the final product, it is important to know how rubber vulcanizates are affected by the nature of carbon black. The aim of this paper is to give a deeper insight into the reinforcement mechanism of the carbon black filler system by analyzing the strain dependence of the complex modulus G* and the loss factor tan delta. The Rubber-Process-Analyzer [2, 3] (RPA, Alpha Technologies) allows a very reliable and detailed investigation of the dynamic behavior on a much easier and faster way than the common dynamic analysis of vulcanizates. The main focus of this work lies on the influence of the nature of carbon black (loading, surface area, structure and surface activity) on the dynamic properties.