question about air pressure in tires?

my tires always look like they don't have enough air (not sure if that's just my imagination)....someone told me that some cars need more air in the front versus the back tires and that it's different depending on if its summer/winter, etc. I have a 2000 Jeep Cherokee but we got it used and it didn't come with the owner's manual (dont ask) and I know you are supposed to check on the side of the door but I couldn't find it all I found was something that said P75. Anyone happen to know what the air pressure should be and what the difference is in front/back and seasons?

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  • Anonymous
    1 decade ago
    Favorite Answer

    Chevy 76 gave you a valuable answer !

    But he didn't say what pressure. The tire people in our town where they make 1000 tires an hour (Goodyear) tell me that 35 lbs is a good safe pressure which will get you the best mileage and acceptable traction.

    Of course you know that if you want a softer ride you go down to as low as 28 lbs and as well if the road is slippery a softer tire offers more "surface" to the road.

    I found having a real good pressure guage, one that is easy to apply and easy to read is a great asset. Struggling with a $1 guage is poor economy. A $5 one is much better. I'll bet Chevy76 will agree to that.

  • 1 decade ago

    Make sure you are using the right size tires for your car and then the correct air pressure is usually written on the car somewhere. Often it can be found when the door is open in an area that can't be seen when the door is closed. Sorry but it's a little hard to decribe. You could definitely do to a Jeep dealership aqnd check at the Parts counter to find out what tires and tire pressure are reccomended for your car year and model. You could probably even just call them.

  • 1 decade ago

    It's probably around 32 psi, and it might look flat to a lay person even if the pressure's ok. You can buy a tire gauge to test it. But the routine maintenance checks (every 5000-7500 miles) should be sufficient to keep your tires at the right pressure. You can ask for the correct pressure when you get the check-up. Also, I'm sure you can get the owner's manual at a jeep dealer or over the internet.

  • 1 decade ago

    look on the sidewall of the tires. look carefully and in small type somewhere it will say ( max press. _ _ psi ). inflate the tires when cold to about 3 psi below that number. usually on SUV tires the max pressure is about 35psi, so inflate them to about 32psi. you will need a pressure guage to do this, and you can get this at an auto part store or walmart for about $1 or so. i'm partial to walmart...

    a few things about checking pressure. first check the pressure when the tires are cold. this usually means first thing before it's driven in the morning. because as tires are driven they heat up and give erroneous pressure readings that are higher than they actually are. or you can wait for a few hours after the car has been driven to check the pressure.

    the door jambs or glovebox should tell you the tires size and recommended pressure, note that these psi numbers give you the best ride, but not necessarily the best gas mileage, generally the higher the psi the better the gas mileage, which is why i recommend going by the max pressure stamped on the tire. DO NOT inflate beyond the max pressure stamped in the sidewall because then you are at serious risk of a blowout which can be fatal.

    more in depth info can be found at the website below.

    good luck

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  • 1 decade ago

    Normally cars have more air pressure in the rear tires. The front tires have a slightly lower air pressure to allow for a greater contact area with the road. Radial tires, which most cars have, have a tendency to look a little low anyway. The seasons are important because air expands when it gets hot and contracts when it cools, so if you have 30lbs. of air in your tires on a 60 degree day and the next day it's 102 degrees (longshot, but an example) the tire pressure is likely to raise 3 to 4 lbs. That's why your tires require less pressure in the summer and more in the winter, due to heat from the road and friction from traveling.

    Source(s): 12 years auto exp. 2 years diesel exp.
  • 1 decade ago

    Some tires are what are known as "low profile". This makes them look flat, even though the air pressure is just fine. I am not sure what type of tires come with a Jeep Cherokee, but you can ask your local tire shop about it. They can give you all the info you need.

  • 1 decade ago

    Different tires need different air pressures. Somewhere, on the sidewalls of your tires, it will tell you what pressures they need. It's usually on both sides of the tires, but depending on how your tires were mounted, you may actually have to climb underneath the vehicle and try to read them on the inside side wall. Unless you're doing alot of towing, or rock climbing, all four of your tires usually take the same amount of pressure.

    The bottom line is........get your tire pressures off of the tires. Don't just take any advice from anyone who doesn't know exactly what tires you have on your vehicle.

  • ted j
    Lv 7
    1 decade ago

    A few more lbs. in the front. That's where all your weight is and turning wears out the edges faster. I run 30 front & 26 rear, hot.

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