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Tire-pressure gauge
A tire-pressure gauge is a pressure gauge used to measure the pressure of tires on a vehicle.
Since tires are rated for specific loads at certain pressure, it is important to keep the pressure of the tire at the optimal amount. Tires are rated for their optimal pressure when cold, meaning before the tire has been driven on for the day and allowed to heat up, which ultimately changes the internal pressure of the tire due to the expansion of gases. The precision of a typical mechanical gauge as shown is ±. Higher precision gauges with ± uncertainty can also be obtained.
== Built-in tire pressure sensors ==
Many modern cars now come with built-in tire pressure sensors that allow all four tire pressures to be read simultaneously from inside the car. In 2005, most on-board Tire Pressure Monitoring Systems (TPMS) used ''indirect'' pressure monitoring. The anti-lock brake sensors detect one tire rotating faster than the rest and indicate a low tire pressure to the driver. The problem with this method was that if tires all lost the same pressure then none would show up against the others to indicate a problem.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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