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#4632675 - 01/12/18 04:49 PM What tire pressure to run?
HoosierJeeper Offline


Registered: 11/23/16
Posts: 1271
Loc: WI
Feels like I've been posting a lot in this section lately... oh well, I'll try to stop eventually. smile

Walmart put 35PSI in my new tires (245/75/16 Hankook Dynapro ATMs, P rated). Does that sound about right for my Liberty? Weight wise I'm guessing it's probably around 4600-4800 lbs once you add in the winch, skid plates and rock rails. Door sticker is irrelevant at this point, I think, not a factory size. I'd do the chalk test but I'd have better luck playing pickup sticks with my butt cheeks than finding a dry section of pavement here for awhile. smile
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96 Jeep XJ Country: STP HM 5W30 (winter)

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#4632693 - 01/12/18 05:02 PM Re: What tire pressure to run? [Re: HoosierJeeper]
StevieBoy Offline


Registered: 08/06/12
Posts: 155
Loc: Central Florida
My G.C. recommends 33/36 psi front/rear in 265/50R20's. Never heard of such a thing! What is the point of a 3 psi difference between front & rear?
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#4632713 - 01/12/18 05:22 PM Re: What tire pressure to run? [Re: HoosierJeeper]
HoosierJeeper Offline


Registered: 11/23/16
Posts: 1271
Loc: WI
My LR3 specs 33 in the front and 42 in the back!
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96 Jeep XJ Country: STP HM 5W30 (winter)

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#4632730 - 01/12/18 05:35 PM Re: What tire pressure to run? [Re: HoosierJeeper]
Jimzz Offline


Registered: 10/03/14
Posts: 1102
Loc: NoVA
I do about 35 in the front and 33 in the rear.
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#4632785 - 01/12/18 06:26 PM Re: What tire pressure to run? [Re: HoosierJeeper]
Alex_V Offline


Registered: 04/10/16
Posts: 1113
Loc: Campbellsville, KY
What is sidewall max PSI?

I'd probably run the fronts 4-6 PSI higher than the rears. The rears, primarily transmitting power to the ground, will have a tendency to wear in the center, where the fronts will tend to wear on the sides from doing the steering. The fronts also carry a bit more weight.
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#4632813 - 01/12/18 06:42 PM Re: What tire pressure to run? [Re: HoosierJeeper]
das_peikko Offline


Registered: 01/01/18
Posts: 410
Loc: San Antonio, TX
35PSI is the standard that most tire shops go by.

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#4632825 - 01/12/18 06:53 PM Re: What tire pressure to run? [Re: HoosierJeeper]
Nick1994 Offline


Registered: 02/19/13
Posts: 9811
Loc: Phoenix, AZ
The door sticker isnít for the dry stock weight of the vehicle, itís for the max loaded point of the vehicle too.

But I usually add a couple PSI. 36 psi in the Jeep and Sonata.
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#4632841 - 01/12/18 07:07 PM Re: What tire pressure to run? [Re: das_peikko]
Aero540T Offline


Registered: 01/08/18
Posts: 15
Loc: MI
Originally Posted By: das_peikko
35PSI is the standard that most tire shops go by.


Interesting. I worked at a tire shop for a little bit and we went by the door sticker as it varied by type of vehicle. As a general rule at least
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#4632868 - 01/12/18 07:31 PM Re: What tire pressure to run? [Re: HoosierJeeper]
Linctex Offline


Registered: 12/31/16
Posts: 5626
Loc: Waco, TX
I wish a published list were available of tire psi BY POUNDS OF LOAD each tire carries!

My F150 is very front heavy, so gets more PSI in front tires, than in back.
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#4632870 - 01/12/18 07:32 PM Re: What tire pressure to run? [Re: Aero540T]
Linctex Offline


Registered: 12/31/16
Posts: 5626
Loc: Waco, TX
Originally Posted By: Aero540T
I worked at a tire shop for a little bit and we went by the door sticker


I have never ever seen a tire shop guy look at the door sticker.

35 psi is VERY common
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#4632934 - 01/12/18 08:14 PM Re: What tire pressure to run? [Re: HoosierJeeper]
HoosierJeeper Offline


Registered: 11/23/16
Posts: 1271
Loc: WI
I want to say max is 44. It's 0 degrees out so that's my best guess.

I would run different pressures front/rear but the tcase would pitch a fit, they have to be within a pound or two of each other for it to shift in/out of 4WD smoothly.
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07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)

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#4632938 - 01/12/18 08:16 PM Re: What tire pressure to run? [Re: Linctex]
Aero540T Offline


Registered: 01/08/18
Posts: 15
Loc: MI
Originally Posted By: Linctex
Originally Posted By: Aero540T
I worked at a tire shop for a little bit and we went by the door sticker


I have never ever seen a tire shop guy look at the door sticker.

35 psi is VERY common


I donít disagree. And it wasnít every vehicle as you start to figure it out. Most passenger cars were 32 if I remember correctly.
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2002 Ford Taurus 24V M1HM & M1EP
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#4632946 - 01/12/18 08:19 PM Re: What tire pressure to run? [Re: HoosierJeeper]
JohnnyJohnson Online   content


Registered: 10/22/09
Posts: 2368
Loc: Wet side WA
My Hankook tires are rated at 51 PSI my car calls for 34 PSI. I run them at 40 PSI. Better MPG more than 0W-20 ever gave me. About a mile per gallon in town and a 2+ MPG increase on the open road.
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#4632989 - 01/12/18 08:51 PM Re: What tire pressure to run? [Re: das_peikko]
Dumc87 Offline


Registered: 06/05/10
Posts: 585
Loc: Florida
Originally Posted By: das_peikko
35PSI is the standard that most tire shops go by.


This.

When I first started airing up tires, I went by the door sticker. In a busy shop environment, you'd be surprised at how time consuming that can be. Some cars don't even have the sticker, or the numbers are illegible. For a myriad of nuance reasons, 35 PSI is a standard.

Now, some cars, like Corolla's, I can remember being around 32/33 PSI front and rear. If I notice I'm working on one of those, I'll put in 33 PSI. But I also realize that so many tires I work with, are being driven by a person who doesn't make it a habit of checking the air. So I end up putting 35 PSI in anyway, knowing it's better for the vehicle to be a tad over recommended PSI than being under; especially when MPG's are more important than handling, for most.


Edited by Dumc87 (01/12/18 08:55 PM)
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#4632996 - 01/12/18 08:57 PM Re: What tire pressure to run? [Re: JohnnyJohnson]
Dumc87 Offline


Registered: 06/05/10
Posts: 585
Loc: Florida
Originally Posted By: JohnnyJohnson
My Hankook tires are rated at 51 PSI my car calls for 34 PSI. I run them at 40 PSI. Better MPG more than 0W-20 ever gave me. About a mile per gallon in town and a 2+ MPG increase on the open road.


When I do tire pressure checks, I sometimes ask what a person wants to run in their tires for this very reason. 40 PSI is pretty high for a Corolla, but if that's your preference and you've seen a good reason to do so, then 40 PSI it is.
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