The curemeter cure curves that are commonly measured in the tire industry are, for the most part, only measured at a single-cure temperature (i.e. an isothermal cure). However, the actual cure profiles in the center of the shoulder area of a tire are much delayed and offset because rubber compounds are basically poor conductors of heat. Through either thermocouple studies or computer modeling,1 precise timetemperature profiles have routinely been established for specific tire designs. Through the new technologies of the Variable Temperature Analysis from the Rubber Process Analyzer, one now easily can study the effects of changes in rubber compounds on the VTA cure curve and what implications this might have on optimizing the factory press cure cycle times.