Correct tyre pressure is essential, because it helps to ensure safety for the driver of a car and its passengers, as well as for others on the road. Under-inflated tyres have an effect on the grip and handling, and can cause irregular or even unpredictable handling performance. In an extreme case, the car may even leave the road. Under-inflated tyres also cause the car to use more fuel, because it requires greater force to make the wheels turn. Under-inflated tyres wear out more quickly than do tyres maintained at optimal pressure. A special gauge, an instrument for measuring the tyre pressure, is a good solution that allows one to regularly check the tyre pressure. Tyre pressure gauges, both conventional and electronic, are available in automotive stores, as well as on online auction sites, such as eBay.
A conventional tyre pressure gauge is not very big, about the size of a pencil. The metal exterior includes plastic rods that extend when one attaches the device to the tyre stem to measure the pressure. The plastic rods extend as the air rushes out of the car tyre. The pressure of the tyre is readable from the notches on the rod's side. Generally, the rods are white, while the notches on them come in black. Notches marking rounded values are larger than others. For instance, every tenth notch may be larger.
Electronic pressure gauges are very convenient to use and they give the most precise measurements, leaving no room for human error when it comes to reading the device. Once the device is switched on, it goes onto the tyre and then quickly displays an accurate tyre pressure value. However, these gauges are often much more expensive than the conventional models. With an electronic gauge, it is also important to ensure that the battery is fully charged, in order to receive accurate readings and stay on the safe side. Keeping spare batteries in the car can help in case of emergency, and a pump should also always be available to inflate the tyres as necessary.
The first important thing to know is the proper pressure range for the specific tyres on the car. The ranges vary by models and car types. The sidewall of the tyre typically indicates the maximum tyre pressure that the tyre can handle, while the range is on a sticker either inside the boot, in the glove box, or on the side door jamb at the driver's side. When starting to measure the pressure, one should ensure that the air valve is open. One should remove the plastic cap and put it into a safe place so as not to misplace it. The pressure gauge should fit against the air valve tightly and firmly, so that no air escapes. A hissing sound indicates that air is getting out, and this calls for a firmer grip.
The value is readable either from the electronic display or from the rod on the mechanical gauge. After finishing the measuring process, it is necessary to place the cap back on the valve. If the gauge shows that the tyres are under-inflated, some more air needs to go inside the tyres via the pump. If the tyres are over-inflated, some air needs to get out.
It is best to measure the tyre pressure of all the tyres about once a month in order to monitor their condition. Checking all of them is essential, because they may have different values. Checking tyre pressure is also highly advisable before going on a longer trip. In addition, the spare tyre also requires checking every once in awhile. Electronic gauges sometimes feature a setting that helps one to remember the tyre pressure value for future measurements. The tyre pressure gauge should fit the vehicle and the correct pressure should be in the middle of the gauge's range. Truck and standard car tyre pressures vary a great deal, so they require different gauges.
On eBay, you can find a range of tyre pressure gauges by using the search function. If the initial results do not correspond to your needs, click on related searches or try refining your keywords by making them either more general or more specific. For example, you can specify whether you are looking for a conventional or an electronic tyre pressure gauge, depending on which one you prefer to use. Always read the detailed item listing to make sure that the gauge meets your needs in terms of the measurement range. Check the tyre pressure on your vehicle about once a month, making sure that you inspect all the tyres, including the spare tyre.