Abstract: An external mount tire pressure sensor system which substantially reduces the effect of centrifugal force on tire pressure measurements. A sensor has a main guide body portion with two parallel leg portions each having a central bore. A slider element is slidably mounted in each leg portion, and the two slider elements are mechanically connected for translatory movement in unison. A spring urges the slider elements to a neutral position. The sensor attaches to a tire valve stem. Gas from a tire encounters one of the slider elements and urges it in opposition to the spring force. The differential interconnection between the two slider elements cancels out the effect of the centrifugal force when the wheel rotates. A stiff flexible wall section enables the axis of the sensor to be aligned with the wheel radius to optimize performance.

Abstract: A pressure detecting device has a main control unit, at least one pressure detecting unit and a display. The display is electrically connected to a main controller of the main control unit and has at least one illustrating and illuminating symbol to show the condition of tire detected by the pressure detecting unit. Each illustrating and illuminating symbol has multiple symbol elements, such that the condition in the tire can be exactly shown to the user with the illustrating and illuminating symbols on the display.