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Unread 04-29-2005, 11:32 AM   #1
historyfool24
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Tire Pressure

I know this is a new guy question and well I am a new guy. But I was wondering what is the tire pressure that the dealer recommands for a 2002 Jeep Grand Cherokee. I must have really bad eyes because I can read it off the tire and then my car, being used, did not come with a manual . so if anyone can help a guy out that would be great.

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Unread 04-29-2005, 11:51 AM   #2
7thStranger
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There should be a sticker on the drivers side door.
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Unread 04-29-2005, 11:59 AM   #3
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33 psi.

I'd get a manual if I were you:
http://cgi.ebay.com/ebaymotors/ws/eB...category=34224

That one looks like a really good deal. Any manual 99-04 should work, off the top of my head I can't think of much that would have been different for a Laredo, but there are so many on eBay that you can get an '02 manual. I thought I still had mine, which I'd send you for the cost of postage, but I can't find it.

Congrats on the new Jeep- what color/options?
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Unread 04-29-2005, 05:24 PM   #4
kensue49
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You could go to the source.
https://techauthority.com
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Unread 05-02-2005, 11:31 AM   #5
historyfool24
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Quote:
Originally Posted by Hooligan1
Congrats on the new Jeep- what color/options?
yeah i love my jeep

its a 2002 they call it Woodland but it looks more like a dark brown. it a 4x4 with the upgraded sound system that is about as far as options go. my dad got it for a steal, he brought the price down by 5 grand and thats not counting the 2 grand i got for my 1994 Saab 900 trade in.

and about the sticker in the door was worn away, hence the thread.
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Unread 05-02-2005, 11:40 AM   #6
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Re:Tire Pressure

Quote:
Originally Posted by historyfool24
I know this is a new guy question and well I am a new guy. But I was wondering what is the tire pressure that the dealer recommands for a 2002 Jeep Grand Cherokee. I must have really bad eyes because I can read it off the tire and then my car, being used, did not come with a manual . so if anyone can help a guy out that would be great.
I can't speak for anyone else,but I'm all for going with the recommended pressure rating on the tire sidewall
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Unread 05-02-2005, 08:01 PM   #7
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Rowdy, the pressure on the sidewall is the maximum pressure. Most tires that fit on your Jeep do not require that much pressure, as our vehicles don't weigh as much as the Suburban and Excursion they can also be mounted on. Look at the label and door panel. With my 31" BFG's, I run about 28 psi, as their rating is more than double the weight of my ZJ, so I only need to run half of the recommended PSI. My tires have 55,000 miles on them, so I guess what I'm doing is about right. Or I could just be lucky.
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Unread 05-02-2005, 08:08 PM   #8
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The recomended psi on the door is for the stock tires. Should I still follow this psi for new aftermarket tires even though they have a suggested max psi that is much higher?
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Unread 05-02-2005, 08:18 PM   #9
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Quote:
Originally Posted by theone13
The recomended psi on the door is for the stock tires. Should I still follow this psi for new aftermarket tires even though they have a suggested max psi that is much higher?

If the tires are what's listed in your sig, you're best off with around 32-34 psi.

NEVER RUN THE MAX PRESSURE! You'll have a bone-jarring stiff ride and the tires will not wear evenly.
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Unread 05-02-2005, 08:47 PM   #10
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Awesome, thanks Hooligan.
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Unread 05-02-2005, 10:54 PM   #11
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Re:Tire Pressure

Quote:
Originally Posted by Airmanwoody
Rowdy, the pressure on the sidewall is the maximum pressure. Most tires that fit on your Jeep do not require that much pressure, as our vehicles don't weigh as much as the Suburban and Excursion they can also be mounted on. Look at the label and door panel. With my 31" BFG's, I run about 28 psi, as their rating is more than double the weight of my ZJ, so I only need to run half of the recommended PSI. My tires have 55,000 miles on them, so I guess what I'm doing is about right. Or I could just be lucky.
I understand what you are saying,Airmanwoody,but in light of all the problems Firestone and Ford had a few years ago I feel safer using the tire manufacturer's recommendations. You are absolutely right about the markings being for maximum inflation
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Unread 05-02-2005, 11:14 PM   #12
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Also its best to measure the psi before you drive and warm up the tires.

http://www.tutorials.com/08/0817/08171.asp
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Unread 05-03-2005, 07:53 AM   #13
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Quote:
Originally Posted by rowdy1
I understand what you are saying,Airmanwoody,but in light of all the problems Firestone and Ford had a few years ago I feel safer using the tire manufacturer's recommendations.
I understand your concern, but the Firestone/Exploder problems were attributed to sidnificant underinflation to give a soft ride. They were not properly inflated. And as you just noted, those tire manufacturers' recommendations are indeed for maximum pressure, and as Hooligan points out, should not be used on our rigs under normal conditions.

It's your decision, of course, and I'm not trying to change your mind. Rather, I want our other (especially younger) viewers here to understand why it's important to use the vehicle manufacturer's recommended pressure and not the tire manufacturer's maximum recommended pressure.
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Unread 05-03-2005, 07:59 AM   #14
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Exploders had those problems because Ford Motor Company was trying to use a tire that was not rated for the weight of the vehicle they were on. Firestone was getting hammered and yes they had some problems, but no worse than any other company. They are the ones that got caught, that's all. Firestone recommended to Ford to use a different tire and Ford said no, because the other tire was more expensive. Big Whoops on their part. The markings are still the maximum and can cause premature tire wear. Ask your tire shop what you should run at. They will probably tell you between 32-36 psi.
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Unread 05-03-2005, 09:25 AM   #15
Hooligan1
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Quote:
Originally Posted by rowdy1
I understand what you are saying,Airmanwoody,but in light of all the problems Firestone and Ford had a few years ago I feel safer using the tire manufacturer's recommendations. You are absolutely right about the markings being for maximum inflation

I'm sure your local tire store loves you... you must go through tires very quickly. Aside from a painfully stiff ride, you'll have terribly uneven wear by running at max pressure.

You're also GREATLY increasing the chances of a blowout by running the tires at a high psi... so if you think you're reducing your chances, you're wrong.

Do you have any idea what the Firestone/Ford controversy was about? Defective tires that were underinflated. Ford recommended too low of a pressure to give the trucks a soft ride, and Firestone made some shoddy tires. I haven't looked, but I think the max pressure on my Goodyear tires is somewhere around 60psi... Goodyear says that's absolutely the most that the rubber is designed to withstand. Jeeps are fairly light weight vehicles, considering the type of vehicle... the tires are designed to be considerably stronger than what a Jeep needs, so they're designed to run at a high pressure.

This is truly one of the dumbest things I've ever heard... running your tires at MAX PRESSURE!
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