Generally, a tire pressure value between 2.3-2.5 is considered normal. If the car is fully loaded (5 people), adjusting the tire pressure to around 2.5 is more suitable. For two people, a tire pressure value of 2.3 is also normal. There are several methods to monitor tire pressure: 1. Direct method: Direct tire pressure monitoring devices use pressure sensors installed in each tire to directly measure the tire pressure. The pressure information is transmitted from inside the tire to a central receiver module via a wireless transmitter, and then the tire pressure data for each tire is displayed. The system automatically alerts when the tire pressure is too low or there is a leak. 2. Indirect method: Indirect tire pressure warning systems actually rely on calculating the rolling radius of the tire to monitor pressure. When the pressure in a tire decreases, the weight of the vehicle causes the rolling radius of that wheel to become smaller, resulting in a faster rotation speed compared to other wheels. By comparing the differences in rotation speeds between tires, the system monitors the tire pressure. 3. Tire Pressure Monitoring System (TPMS): It combines the advantages of both systems mentioned above. It is equipped with direct sensors in two diagonally opposite tires and a 4-wheel indirect system. Compared to using only a direct system, this hybrid system can reduce costs and overcome the drawback of indirect systems not being able to detect when multiple tires simultaneously have low pressure. However, it still cannot provide real-time data of the actual pressure in all four tires like a direct system does.
