How do I know how much air to put in car tires?

How Much Air In Tires

Are you kidding me. First check on the side of your tire for the correct inflation rate. ie PSI ( pounds per square inch ) Next get yourself a tire gage. Screw of the little cap on the tire, this is called an air nipple ) press the tire gage onto the part you just screwed off. The end of the tire gage should pop out. Read it, it should tell you the tire pressure. If it's low get out the air hose and add some air to the air nipple. Checking about every 10 seconds. Do not over inflate. Note all your tires should be at the same tire inflation rate. Lastly if your still unsure, pulling into a full service station and pay someone do inflate your car tires to the correct rate.

Three alternatives:-

There will be a label either on the driver's side door pillar, the back of the door near the lock, inside the gas flap or under the hood (I've seen all of those on different vehicles) which will list the standard tire pressures for the standard tire sizes under different load and speed conditions.

The owner's manual will list the correct tire pressures.

Tire service places will have a wall chart with the correct tire pressures.

Prefer the car manufacturer's figures.

Over time check the tire wear, if they wear on either the inside or outside edges, or the tread blocks start developing raised edges then the alignment needs attention.

If the outside edges wear faster then you are running too low pressure. If the middle wears faster then you are running too high pressure. In both cases by the time you can tell the tires may be worn beyond use.

If you run non-standard tire sizes then try a user group for your car. I run 18" wheels on my VW so I consulted the folks on vwvortex.com before I ordered them.

Don't exceed the pressure rating on the tires, be cautious of running greatly under the stated pressure too. Part of the Ford Explorer debacle was that Ford advised the use of too low a pressure which increased the rate of wear on the tire carcase.

Open your driver side door. On the frame of the door (if you are looking into your car it will be on the lower right side) there will be a label with the recomended tire pressure for the front and rear tires.

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Just ask someone who works at the petrol station (or garage) to show you how it's done. It's very simple, but difficult to explain.

Look on the side of the tires,they should say how much psi to put in them,most of them are 35psi.Make sure you use a tire air gauge to make sure you have the proper amount of air.

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The ideal PSI should be on displayed on the side of the tires.

look at your owners manual.