A novel approach to the delay analysis of various service disciplines in symmetric token ring networks is presented. It is shown that exact or approximate expressions for the average packet delay of different service disciplines can be directly derived by the delay expression of the exhaustive service system. This is accomplished by: (a) inflating, by an appropriate factor, the packet size of the discipline whose performance is analyzed and (b) using the inflated packet in the delay expression of the exhaustive service system. The proposed method is applied to the limited service and time token systems, and its accuracy is verified by simulation results. Advantages of the method are its higher accuracy over previous analytic methods and its robustness to ring latency and other system parameters.