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tyre pressure
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A tire-pressure gauge, or tyre-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.
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hey here is your answer
Air. You won't go far without it, your car's engine needs plenty of it, and your teeth would have long since rattled from their mountings had Mr Dunlop not thought to fill his tyres with a comfy cushion of the stuff.
In ye olden days tyres could leak more than Julian Assange, but tyre tech has come a long way and many drivers now take their rubber for granted.
It's still well worth keeping tabs on your tyre pressures though. A pressure gauge costs peanuts, and they're as easy to use as unscrewing the dust cover from your tyre's valve before firmly pressing the gauge on it to avoid air escaping.
Pressure is usually measured on two scales: PSI (pounds per square inch), or bar (the metric equivalent).
hope it help u
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