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What tire pressure to run? #4632675
01/12/18 04:49 PM
01/12/18 04:49 PM
Joined: Nov 2016
Posts: 1,283
WI
HoosierJeeper Offline OP
HoosierJeeper  Offline OP
Joined: Nov 2016
Posts: 1,283
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


15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)
Re: What tire pressure to run? [Re: HoosierJeeper] #4632693
01/12/18 05:02 PM
01/12/18 05:02 PM
Joined: Aug 2012
Posts: 169
Central Florida
StevieBoy Offline
StevieBoy  Offline
Joined: Aug 2012
Posts: 169
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?


2018 Grand Cherokee Limited
25th Anniversary Sterling Edition
Re: What tire pressure to run? [Re: HoosierJeeper] #4632713
01/12/18 05:22 PM
01/12/18 05:22 PM
Joined: Nov 2016
Posts: 1,283
WI
HoosierJeeper Offline OP
HoosierJeeper  Offline OP
Joined: Nov 2016
Posts: 1,283
WI
My LR3 specs 33 in the front and 42 in the back!


15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)
Re: What tire pressure to run? [Re: HoosierJeeper] #4632730
01/12/18 05:35 PM
01/12/18 05:35 PM
Joined: Oct 2014
Posts: 1,349
NoVA
Jimzz Offline
Jimzz  Offline
Joined: Oct 2014
Posts: 1,349
NoVA
I do about 35 in the front and 33 in the rear.


yup
Re: What tire pressure to run? [Re: HoosierJeeper] #4632785
01/12/18 06:26 PM
01/12/18 06:26 PM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,198
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.


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: What tire pressure to run? [Re: HoosierJeeper] #4632813
01/12/18 06:42 PM
01/12/18 06:42 PM
Joined: Jan 2018
Posts: 538
San Antonio, TX
das_peikko Offline
das_peikko  Offline
Joined: Jan 2018
Posts: 538
San Antonio, TX
35PSI is the standard that most tire shops go by.

Re: What tire pressure to run? [Re: HoosierJeeper] #4632825
01/12/18 06:53 PM
01/12/18 06:53 PM
Joined: Feb 2013
Posts: 11,095
Phoenix, AZ
Nick1994 Online content
Nick1994  Online Content
Joined: Feb 2013
Posts: 11,095
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.


2015 Hyundai Sonata 2.4L 88k Motorcraft Synthetic Blend 5w30 & OEM
2000 Toyota Camry 2.2L 231k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra
Re: What tire pressure to run? [Re: das_peikko] #4632841
01/12/18 07:07 PM
01/12/18 07:07 PM
Joined: Jan 2018
Posts: 30
MI
Aero540T Offline
Aero540T  Offline
Joined: Jan 2018
Posts: 30
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


2004 Jeep Grand Cherokee Limited 4.7L (wifeís) PUP & FU
2002 Ford Taurus 24V M1HM & M1EP
2001 Dodge Ram 1500 5.9L 4x4 10w-30 RP & FU
1993 Yamaha FZR 600
Re: What tire pressure to run? [Re: HoosierJeeper] #4632868
01/12/18 07:31 PM
01/12/18 07:31 PM
Joined: Dec 2016
Posts: 7,174
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,174
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.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: What tire pressure to run? [Re: Aero540T] #4632870
01/12/18 07:32 PM
01/12/18 07:32 PM
Joined: Dec 2016
Posts: 7,174
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,174
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


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: What tire pressure to run? [Re: HoosierJeeper] #4632934
01/12/18 08:14 PM
01/12/18 08:14 PM
Joined: Nov 2016
Posts: 1,283
WI
HoosierJeeper Offline OP
HoosierJeeper  Offline OP
Joined: Nov 2016
Posts: 1,283
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.


15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)
Re: What tire pressure to run? [Re: Linctex] #4632938
01/12/18 08:16 PM
01/12/18 08:16 PM
Joined: Jan 2018
Posts: 30
MI
Aero540T Offline
Aero540T  Offline
Joined: Jan 2018
Posts: 30
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.


2004 Jeep Grand Cherokee Limited 4.7L (wifeís) PUP & FU
2002 Ford Taurus 24V M1HM & M1EP
2001 Dodge Ram 1500 5.9L 4x4 10w-30 RP & FU
1993 Yamaha FZR 600
Re: What tire pressure to run? [Re: HoosierJeeper] #4632946
01/12/18 08:19 PM
01/12/18 08:19 PM
Joined: Oct 2009
Posts: 3,524
Wet side WA
JohnnyJohnson Online content
JohnnyJohnson  Online Content
Joined: Oct 2009
Posts: 3,524
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.


2004 Corolla 126813
Out: VML 5w-30 TG4967 OCI 5007 Miles
In: EDGE EP 5W-30 Bosch 3311 122537 7-18-18
2006 Duramax 74478
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 73705 4-22-18
Re: What tire pressure to run? [Re: das_peikko] #4632989
01/12/18 08:51 PM
01/12/18 08:51 PM
Joined: Jun 2010
Posts: 591
Florida
Dumc87 Offline
Dumc87  Offline
Joined: Jun 2010
Posts: 591
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.

Last edited by Dumc87; 01/12/18 08:55 PM.

'90 Z32 - PP HM 10w30
'98 ZJ - PYB HM 10w40
'02 G20 - QS UD 5w30
'09 Matrix - QS UD 0w20
Re: What tire pressure to run? [Re: JohnnyJohnson] #4632996
01/12/18 08:57 PM
01/12/18 08:57 PM
Joined: Jun 2010
Posts: 591
Florida
Dumc87 Offline
Dumc87  Offline
Joined: Jun 2010
Posts: 591
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.


'90 Z32 - PP HM 10w30
'98 ZJ - PYB HM 10w40
'02 G20 - QS UD 5w30
'09 Matrix - QS UD 0w20
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