Tire Pressure 30" - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 11-25-2011, 08:37 PM   #1
Jeeper
 
2003 wrangler's Avatar
 
Join Date: Jul 2011
Posts: 313
Tire Pressure 30"

I was wondering, what would be the ideal tire pressure to maximize fuel economy and to maximize tire life for a 30" yokahama geolandar at-s tire. The sidewall of the tire says that the max load is at 50 psi and I have been keeping it around that 50 psi mark. Is this ok or am I doing something wrong? I just worry about it because I feel like my rear tires are wearing more than my front tires and I only have about 3k miles since I got my jeep. Thanks in advance for all replys!!

2003 wrangler is offline   Quote Quick Reply
Old 11-25-2011, 11:29 PM   #2
Jeeper
 
TnDz TJ's Avatar
 
Join Date: Apr 2011
Location: Reno, NV
Posts: 2,925
Images: 220
For one.... That is max psi. I run 30-35 psi on my 31's. The more psi , the better mpg you may get and a harsher ride than with a lower psi like 25-28.

__________________
~Todd~ 2004 X 4.0 5 speed---SOLD
4" Lift, 4.56's, 33" Duratracs on M/T Classics
RR SYE, Tatton CV, MML, BL, TT, Dynomax Exhaust
Hella Lighting: Driving, Fogs and H4 E-Codes
NOPE! ... and NEVER will be...
TnDz TJ is offline   Quote Quick Reply
Old 11-25-2011, 11:42 PM   #3
Jeeper
 
Tmstar05's Avatar
 
Join Date: Nov 2011
Location: El paso
Posts: 142
Holy cow r u nuts? Lol yea 50 is the max plus your chances of burning rubber are superb lol which wears out your tires real quick even when you come to a complete stop and you make a turn your tire will spin and in no time your tires will be bald especially the back ones first. I run 25psi on my 33's but stay in between 1500-2000 rpm's. And I rotate them every 6000 miles.
Tmstar05 is offline   Quote Quick Reply
Old 11-26-2011, 05:35 AM   #4
Jeeper
 
cork1958's Avatar
 
Join Date: Nov 2008
Location: MI
Posts: 560
Yeah,
32-35psi on my 31's also.
cork1958 is offline   Quote Quick Reply
Old 11-26-2011, 05:48 AM   #5
Jeeper
 
Join Date: Jul 2011
Posts: 50
Look at the sticker on the inside of the drivers door, That is the manufacturers specified cold psi for that vehicle. my 2003 sahara with 30x9.5 is 29 psi.
Defiance03Sahara is offline   Quote Quick Reply
Old 11-26-2011, 07:14 AM   #6
Moderator

WF Supporting Member
::WF Moderator::
 
doclouie's Avatar
 
Join Date: Feb 2010
Location: In the mountains.
Posts: 3,660
Images: 4
30 psi on 31s.
__________________
2000 Sahara, 3.5" Rubicon Express Lift, 1" spring spacer & 1" Body Lift, 33" or 35" BFG Mud tires, Front & Rear ARB, Rancho 9000 shocks, UCF Ultra High Belly Up

doclouie is offline   Quote Quick Reply
Old 11-26-2011, 08:13 AM   #7
Jeeper
 
TnDz TJ's Avatar
 
Join Date: Apr 2011
Location: Reno, NV
Posts: 2,925
Images: 220
lower your psi down to 30-35 and you will think you are in a Cadillac LOL!!! The wear is also going to show more on the rear since you have a better tendency to 'slip' with such a high psi. Rotate your tires at every oil change ( every 3000 miles for me) and keep them uniformly even.
__________________
~Todd~ 2004 X 4.0 5 speed---SOLD
4" Lift, 4.56's, 33" Duratracs on M/T Classics
RR SYE, Tatton CV, MML, BL, TT, Dynomax Exhaust
Hella Lighting: Driving, Fogs and H4 E-Codes
NOPE! ... and NEVER will be...
TnDz TJ is offline   Quote Quick Reply
Old 11-26-2011, 03:08 PM   #8
Jeeper
 
2003 wrangler's Avatar
 
Join Date: Jul 2011
Posts: 313
Since I read all of the posts, I have lowered my psi in all of my tires to 32psi. Is that good? Thanks for all of the replys it is greatly appreciated. I guess since this is my first jeep, I didnt realize that that was so bad, but im glad I asked i learned something new today! Thanks.
2003 wrangler is offline   Quote Quick Reply
Old 11-26-2011, 03:15 PM   #9
Jeeper
 
freeskier's Avatar
 
Join Date: Mar 2011
Location: Longmont, CO
Posts: 2,476
Quote:
Originally Posted by Defiance03Sahara View Post
Look at the sticker on the inside of the drivers door, That is the manufacturers specified cold psi for that vehicle. my 2003 sahara with 30x9.5 is 29 psi.
Manufacturer specs go out the window when you deviate from stock tire size.
freeskier is offline   Quote Quick Reply
Old 11-26-2011, 03:21 PM   #10
Jeeper
 
InvertChaos's Avatar
 
Join Date: Sep 2010
Location: NoVa
Posts: 7,879
Quote:
Originally Posted by freeskier

Manufacturer specs go out the window when you deviate from stock tire size.
30x9.5 is about stock tire size iirc
__________________
|2004 Jeep TJ "Green Machine"|4.0L 5 speed Dana44|33x12.50x15 Goodyear Duratracs|2.5" RC coils + 1.25" body lift|OME NitroSport shocks|4.56 gears|Skid Row Engine Skid|BCC Sliders|Currie AntiRock|
InvertChaos is offline   Quote Quick Reply
Old 12-04-2011, 09:33 AM   #11
Jeeper
 
Join Date: Nov 2011
Location: Wilderness, Virginia
Posts: 29
How low should I set tire pressure when going off road? 30 X 9.5 Not rock crawling, just trail and maybe mud.

2001 Wrangler Sport, stock suspension.
Rinkers Ranch is offline   Quote Quick Reply
Old 12-04-2011, 10:24 AM   #12
Jeeper
 
Atthehop's Avatar
 
Join Date: Jul 2008
Location: NW, NJ
Posts: 3,772
I ran 26 in my 30's and 28 in my 31's. Got over 75k on 30's and 19-20 mpg highway. These are BFG AT's which have stiff sidewalls.
__________________
Retired my 94 YJ 4cyl 5spd @ 200K
Now in a 04 TJ 4cyl 5spd CV @120K+
Both as a commuter vehicle in NW, NJ
April 2012.downsized and now a 99er.
Atthehop is online now   Quote Quick Reply
Old 12-04-2011, 11:46 AM   #13
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 31,076
Images: 2
Quote:
Originally Posted by Rinkers Ranch View Post
How low should I set tire pressure when going off road? 30 X 9.5 Not rock crawling, just trail and maybe mud.

2001 Wrangler Sport, stock suspension.
You can safely air them down to 12-13 psi. Any higher than that and you're really not airing down.

I once had a new Rubicon owner and his wife (both new to offroading) in my group doing a moderately difficult trail. He and his wife were getting progressively angrier saying we misled them on the trail's difficulty, that it was way more difficult than they were led to believe it would be. They were having trouble and their tires were spinning where I didn't think they should be spinning so I asked what pressure he had lowered his tire pressure to. He very testily said they were aired "way down" and that he wasn't going any lower. 30 minutes later he was by then holding the group up and his wife was pissed at the world and all of us for "misleading" them so badly. I pushed back hard on the tire pressure issue and pushed for what pressure his tires were at when he snapped back '20'. After a few minutes of discussion, I told him either he or I was going to take his tire pressure down to 12 psi. He was unbelievably angry by this time so I just started airing his tires down when he took over. Once he got his tires to 12 psi, he had no more problems on the trail and the guy and his wife finally started having a little fun with their new Rubicon.

Moral of the story... don't be afraid to air your tires down enough. This wasn't directed at you Rinkers Ranch, this was just a quick story to illustrate the importance of airing down 'enough'.
__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 12-04-2011, 03:19 PM   #14
Jeeper
 
Join Date: Nov 2011
Location: Wilderness, Virginia
Posts: 29
Thanks Jerry, that is exactly the information I needed. I looked over this site for a # but the only thing I found about off road tire pressure was 'air them down' before getting on the trail. I have no problem with the 12 -13 psi range. I didn't want to drop the pressure so low as to pop the bead off the wheel.

Also on the highway pressure; I was told by my friend who owns a small tire shop, the factory spec is set more to ride quality than tire wear or handeling. He said to determin the best wear tire pressure was to set the pressure between factory pressrue and max tire pressure. His formula is to take the Max pressure on the tire, subtract the factory spec. pressure, take half of the difference and add it to the factory spec. pressure and this is the best pressure for tire wear. So I run my Jeep tires at 41psi. 50psi - 32psi = 18psi /2 = 9psi + 32psi = 41psi. This has given me great tire wear on the Jeep, pick-up, and car, but at the expense of the ride quality. Just the same, I'm going to air them down, on the Jeep, to about 32psi, run them that way for a couple of weeks, and check for any change in the wear.

Thanks again, Wayne

Oh, I told you wrong about my tire size. They are 31" X 10.5" BF Goodrich M+S.
Rinkers Ranch is offline   Quote Quick Reply
Old 12-04-2011, 03:26 PM   #15
Jeeper
 
RSC17's Avatar
 
Join Date: Nov 2009
Location: Cleveland, OH
Posts: 698
Images: 1
Quote:
Originally Posted by Jerry Bransford View Post
You can safely air them down to 12-13 psi. Any higher than that and you're really not airing down.

I once had a new Rubicon owner and his wife (both new to offroading) in my group doing a moderately difficult trail. He and his wife were getting progressively angrier saying we misled them on the trail's difficulty, that it was way more difficult than they were led to believe it would be. They were having trouble and their tires were spinning where I didn't think they should be spinning so I asked what pressure he had lowered his tire pressure to. He very testily said they were aired "way down" and that he wasn't going any lower. 30 minutes later he was by then holding the group up and his wife was pissed at the world and all of us for "misleading" them so badly. I pushed back hard on the tire pressure issue and pushed for what pressure his tires were at when he snapped back '20'. After a few minutes of discussion, I told him either he or I was going to take his tire pressure down to 12 psi. He was unbelievably angry by this time so I just started airing his tires down when he took over. Once he got his tires to 12 psi, he had no more problems on the trail and the guy and his wife finally started having a little fun with their new Rubicon.

Moral of the story... don't be afraid to air your tires down enough. This wasn't directed at you Rinkers Ranch, this was just a quick story to illustrate the importance of airing down 'enough'.
I know you are referring to the specific question but let me add that the width of your wheel is a factor on how much you can air down. Stock Jeep wheels and wheels up to 8" are safe running that low (12psi). A 9" wheel is probably going to be OK as well. When you get to 10" wide wheels, the possibility of popping a bead is very high at such low pressures. This, of course, pertains to a standard wheel with no beadlock. This is exactly why I'm switching out my 10" wheels for 8". I wouldn't even have 10" wheels if I hadn't gotten them for free.
__________________
Northeast Ohio 4x4 . com
4x4 Tech Discussion - Events - Classifieds

^Check us out
RSC17 is offline   Quote Quick Reply
Old 12-04-2011, 04:42 PM   #16
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 31,076
Images: 2
Quote:
Originally Posted by Rinkers Ranch View Post
Thanks Jerry, that is exactly the information I needed. I looked over this site for a # but the only thing I found about off road tire pressure was 'air them down' before getting on the trail. I have no problem with the 12 -13 psi range. I didn't want to drop the pressure so low as to pop the bead off the wheel.

Also on the highway pressure; I was told by my friend who owns a small tire shop, the factory spec is set more to ride quality than tire wear or handeling. He said to determin the best wear tire pressure was to set the pressure between factory pressrue and max tire pressure. His formula is to take the Max pressure on the tire, subtract the factory spec. pressure, take half of the difference and add it to the factory spec. pressure and this is the best pressure for tire wear. So I run my Jeep tires at 41psi. 50psi - 32psi = 18psi /2 = 9psi + 32psi = 41psi. This has given me great tire wear on the Jeep, pick-up, and car, but at the expense of the ride quality. Just the same, I'm going to air them down, on the Jeep, to about 32psi, run them that way for a couple of weeks, and check for any change in the wear.

Thanks again, Wayne

Oh, I told you wrong about my tire size. They are 31" X 10.5" BF Goodrich M+S.
41 psi is simply too high for a Load Range C 31" tire supporting a vehicle with the weight of a TJ. The factory's recommended air pressure hasn't been about ride quality in many years, it is now higher for better mpg so they can up their fleet (CAFE) mpg averages to meet the ever increasing EPA's regulations.
__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 12-05-2011, 05:22 AM   #17
Jeeper
 
Join Date: Nov 2011
Location: Wilderness, Virginia
Posts: 29
Thanks for the quick reply. I'm going to lower the air pressure today. I understand your comment about tire pressure and ride quality. Yes, my friend and I both learned our tech stuff in an earlier time, and have not kept up with some of the changing technology as I should have. 42 years with Caterpillar (tractor division) taught me just how fast technology changes, and just keeping up was a full time job. Now that I'm retired I don't keep up with things as well as I use to.

Thanks again for helping and old man keep up, Wayne
Rinkers Ranch is offline   Quote Quick Reply
Old 08-27-2012, 11:15 PM   #18
Jeeper
 
shanes04wrangler's Avatar
 
Join Date: Feb 2012
Location: chicago
Posts: 273
on my 04 tj it says 33psi inside the door but i have my 30x9.5 at 30psi. I just fig its better for wear and comfort and mpg dont matter its a jeep.

shanes04wrangler is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Poison Spyder Rear Stinger Tire Carrier DTS Vendor Spotlight! Great Deals for Members. 36 05-02-2014 06:28 AM
Tire Pressure question GeePers TJ General Discussion Forum 21 11-01-2011 09:38 PM
Tire pressure grunt0341 TJ General Discussion Forum 4 08-06-2011 09:50 AM
tire pressure on road tntviper1 General Jeep Discussion 20 06-04-2011 12:21 PM
Tire pressure for 31x10.50 akawonderchild TJ General Discussion Forum 16 05-07-2011 01:13 AM


logo carid shop wrangler parts carid fender flares custom wheels store avs deflectors at carid
» Rates
Get low rates on auto insurance in Canada!

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 07:44 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC