The report presents the results of testing rubber for massive tires with different types of fillers. Based on the molecular-phenomenological model of the phenomenon of amplification, the behavior of the stretching curves and hysteresis losses are explained. One of the main components of rubber compounds, affecting the output characteristics of the product, is a filler. As the investigated fillers were selected: 1. iron oxide fillers (modified by fullerenes and unmodified) with different particle sizes; 2. Taunit filler (carbon nanotubes). In the course of the work, it was revealed that modified taunit nanotubes and fullerene-containing iron oxide filler (JON) in certain concentrations lead to an increase in strength and a decrease in hysteresis losses. When added to rubber for massive tires JON, modified with fullerene, in an amount of 20 mph, strength does not decrease and heat generation decreases by 24%. Adding other fillers in such quantities is always accompanied by a significant deterioration in performance. When adding this JON in the amount of 5 m. there is an increase in strength and a decrease in heat generation, which indicates the possibility of including this filler as an active. The article also explains the features of the stretching curves for rubbers with different types of filler based on the enhancement model. The model uses the idea of the presence on the surface of active filler particles of a thin layer of a rubber matrix that is in a pseudo-glassy state, which, as it moves away from the surface of the filler, becomes a highly elastic state. When the composite is deformed, the most stretched macromolecules are not torn, but are pulled out of the pseudoglass layer by a mechanism close to the phenomenon of forced elasticity (cold flow). The main thermal losses in the composite occur in the transition zone from the pseudo-glass to the highly elastic states.