salad

I used 6 tons doing my 3" lift. 3 ton stands are ample to hold your axle up to change tires

jeeper albert

How much psi should my tires have ?
30'' BFG mud-terrain km2

gunmetal_nightrider

Deleted by me.

jeeper albert

Thanks, the reason I'm asking is because of wobbling issues.
I haven't filled them in a while so it might be wobbling because of to little air.
Atleast that's what I think.

Temperatures here are mostly around 95F and my offroading is low to mid level.

salad

Larger tires take less air pressure (but more volume) to provide the same support to your Jeep. Stock 28" tires took around 32 PSI (you can verify this by looking at the sticker on the driver's door jamb). I would start with 30 PSI and go from there.

There are formulas and a thing called a chalk test to determine exactly how much you need. More here: http://www.jeepforum.com/forum/f9/ti...-bfg-s-478109/

No... no they don't. These are not lawn mowers. The MAX PSI written on the sidwall is the point at which the manufacturer is no longer responsible if the tire explodes on the highway.

WTF? I didn't even run my Tercel that high when hyper-miling. Your Jeep must ride like **** and slide in the rain.

NewKindOfClown

We've had this argument with him before, and he won't budge.

To everyone else, PLEASE do not ever run 50psi in your tires.

Stock recommended pressure is 33psi, and each tire size you go up should drop the pressure more.

A specific volume (amount) of air is what is needed in each tire. If you have a larger tire and put in the same amount of air, the pressure per square inch (psi) will be lower.

Running the max pressure stated on your tires is a mistake. Running an even higher psi is downright dangerous

abodyjoe

man that sounds like a lot unless its some kind of tow rig. don't your tires wear more in the center?

McCaffrey

Back in the 90's when the little economy car were just coming out they did a coast to coast millage test where they ran 60 psi in the tires and peed in jugs. I think it was less than $100 worth of gas for the whole trip. Anyway, 50-60 might be safe but certainly not going to wear well like that. And I said "might" so don't get all excited.

Outlaw Star

Clown said it best. Do not run the maximum pressure in your tires. Quick physics/mechanical lesson for you. Two things are closely related, tempature and pressure. As you drive, your tires heat up. This will cause the pressure to increase within the tire. So say you pump that puppy up to its max pressure of 50 pounds. Then drive around for an hour or two, you can now bet that the pressure is well over that 50psi, you have now successfully EXCEEDED the safe max pressure of said tire.
Hint/TIP: (let's use 50psi so we have an even number here) Say your tire is rated at 50psi and you do a lot of driving, try not to inflate over 45psi, that way you have a safe margin for expansion.

NewKindOfClown

It also depends on dozens of variables including wheel size, vehicle weight, and tire compound. I understand what your saying, but I don't think it's comparable.

Besides those differences, a lot has changed in the last 20 years since that test, both in the manufacturing and scientific fields.

gunmetal_nightrider

My apologies for the wrong PSI info OP. Not my intention. You came here for good information not bad. Sorry guys, thanks for correcting me though. I gotta go check my tires.

McCaffrey

It wasn't meant to be a comparison. My only point was that 50-60 psi is not unreasonable. Also I just found it's the law in the US the max pressure be marked on the tire. I'm sure somebody will say "it's not on my tire" but I'm just saying it's the law.

Nick-UK

Noob lift and tire questions.

I`m thinking of getting a rusty off road 3" advanced lift on my 97 Cherry . http://www.rustysoffroad.com/jeep-su...anced-kit.html

Would you recommend just getting the kit in its standard form or are things like adjustable uppers and lowers important upgrades ?

Id rather stick with the standard kit if poss as that makes a sye and shaft still in my budget

I`ll not be using the jeep for any hardcore off roading , mostly a dd and a few mild trails .

Also will 31`s fit on my standard tear drop alloys or will I need wheels with less back spacing or spacers .

Thanks for any input . Nick

abodyjoe

far from an expert here but that looks like a pretty complete kit for your intended use. i don't think you'll need adjustable uppers or lowers with that.. as far as stock wheels go.the only problem is that the tires will rub the lower control arms when the wheel is fully turned. i haven't found it to be an issue and i use mine pretty much how you say you are going to use yours. i guess it would annoy some though..

Nick-UK

Cheers Fella , Thats what I was hoping to here I can live with a bit of rubbing on full lock . Upgrading the wheels can be a cost for another day . My currant tires have seen better days so I can get stuck in to the most important jobs first .