Exemplary of the furazan oxides useful in the vulcanizates of this invention are those that can be represented by the formulae: ##STR3## wherein none, one or any two of the ring positions can be substituted with lower hydrocarbyl, halogen, lower hydrocarbyl oxy, lower hydrocarbyl thio, lower hydrocarbyl carbonyl, carbonyl lower hydrocarbyl oxy, nitro, amine or amino groups and Y is a linking atom