This system is a external can bus race car tpms for racing car wireless tire pressure monitoring system, it includes 4pc external sensors and 1pc receiver with can-bus port. Sensors measurement tire pressure and temperature data, then send these data to the receiver by wireless RF, The receiver send these data to CAN-BUS network, The instrument or other display device collect all tire data and display from can-bu network. When the pressure or temperature over or under warning valve value, the instrument will warn automatically to remind the users pay attention to the tires’ situation.