Tire-pressure gauge
A tire pressure gage is used to measure the pressure of tires on a vehicle. Since tires are rated for specific loads at certian psi, 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 gasses. Some modern cars such as the Caddilac STX now come with a built in tire pressure sensor that allows for all four tire pressures to be read simeotaniosly from inside the car. Most owners only check their tire pressure when they realize their tire is nearly flat, which can effect ride quality and negatively gas mileage. Most owner's manuals reccomend checking tire pressure at least once a week. Tire pressure gages are essential for auto cross vehicles, where much of the tuning of the car is in the pressure of the air in the tire, and owners will often read and adjust the pressure of the tire a dozen or more times over the course of a day.
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