Tire Pressure Monitoring Systems (TPMS) are modules implemented in highly instrumented vehicles to analyze the tire pressure condition at any time. When the vehicle is lack of this instrumentation level, indirect TPMS can be used by considering the vehicle dynamics behavior through conventional sensors. In this paper, two different approaches have been studied to monitor indirectly the tire pressure condition in a vehicle. The first approach one is based on the angular speeds of the four wheels by considering the vehicle load transfer, while the second method is based on the vertical vehicle dynamics by using each corner as an independent monitoring system. Both approaches have been compared in different simulation scenarios in order to highlight their main advantages and drawbacks to consider for their implementation.