Everything about Tire-pressure Gauge totally explained
A
tire-pressure gauge is a
pressure gauge used to measure the
pressure of
tires on a vehicle.
Environmental conditions can introduce a 13% to 15% variability in pressure due to temperature (0 °C to 40 °C), and additional changes can result due to altitude. Most car owner manuals don't state rated pressure as a function of temperature or altitude and leave it to the user to make appropriate measurements.
Since tires are rated for specific loads at certain pressure, it's 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. The accuracy of a typical mechanical gauge as shown is +/- 3 PSI. Higher accuracy gauges with +/- 1 PSI accuracy can also be obtained.
Built in tire pressure sensors
Many modern cars such as the
Cadillac SRX and
Jeep Liberty now come with built in tire
pressure sensors that allow all four tire pressures to be read simultaneously from inside the car.
Tire pressure monitoring systems are also fitted as an option to the latest generation of
BMW motorcycles.
As of 2005, most on-board TPMS utilized
indirect pressure monitoring. The anti-lock brake sensors detect one tire pulling more than the rest and indicate a low tire pressure to the driver.
Regulations on tire pressure
By September 2007 all new automobiles below 10,000 pounds sold in the United States will be required to incorporate a
direct pressure measurement for each tire. The driver must be notified if any tire is underflated by 25% or more than the rated placard
(External Link
) tire pressure.
Further Information
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