PSI offroad - 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 03-18-2013, 11:38 AM   #1
Jeeper
 
DBoat's Avatar
 
Join Date: Jul 2012
Location: The Big D
Posts: 1,435
PSI offroad

I am sure there are some threads on this... but..

I have 17" wheels with 33" tires.. just need some recommendations on how far to air down the tires for some crawling. I run 30 psi on the street..

Is 17 psi low enough? 12 psi? Post up..

Thanks
Dana

DBoat is offline   Quote Quick Reply
Old 03-18-2013, 11:40 AM   #2
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 31,096
Images: 2
Until you get below 15 psi, you're not really airing down for offroading. You can safely air down to 11-12 psi. But part of that depends on your wheel width... you can safely air down to lower air pressures before it may unseat with a 15x8 wheel than you can with a 15x10 wheel.

Even before I got my beadlock wheels I would air my 35x12.50 tires on 15x8 wheels down to 7-8 psi for tougher trails & they never unseated.

__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 03-18-2013, 02:40 PM   #3
Jeeper
 
Sherpa's Avatar
 
Join Date: Oct 2010
Location: Lehi, UT
Posts: 1,049
Like Jerry, I am also running 35x12.50 tires on 15x8 non-beadlock wheels. I regularly air down to 12 psi front, 10 psi rear and have no issues whatsoever off road. I leave a couple extra pounds up front since (in my mind, anyway) a tire that steers is more likely to unseat... though I'm pretty confident I could drop another two pounds without worry.
__________________
Dempsey Bowling
My fleet: 91 Miata, 98 Wrangler Sport, 06 Mustang GT, 01 Suburban 8.1L, 14 Forte EX
Jeep mods: 4" longarm + 1" BL, 35" KM2s, 4.56s with dual ARBs... and lots of scratched armor
Sherpa is offline   Quote Quick Reply
Old 03-18-2013, 05:34 PM   #4
Jeeper
 
1ofakind's Avatar
 
Join Date: Dec 2012
Posts: 126
i have 33x12.50 on my 15x8 wheels, typically air down to 6-8psi in the snow with zero trouble. 10 would work also
1ofakind is offline   Quote Quick Reply
Old 03-18-2013, 06:02 PM   #5
Jeeponator

WF Supporting Member
 
Michigunman's Avatar
 
Join Date: Aug 2010
Location: Cumming, GA
Posts: 1,212
Not knowing your exact specs, I'm running similar. 285/70x17 (33x11.5) tires on 8" wide rims. I had been airing down to 12 psi. I recently started going down to 10 with noticeable improvements. My tires were barely squatting at 12. Never burped any air or had any issues.

Attached is a picture from this past weekend.
Attached Thumbnails
Click image for larger version

Name:	down.jpg
Views:	64
Size:	243.2 KB
ID:	224504  
__________________
Michigunman

Just because you can doesn't mean you should.
Michigunman is offline   Quote Quick Reply
Old 03-18-2013, 06:18 PM   #6
Jeeper
 
amiller's Avatar
 
Join Date: Jun 2012
Posts: 349
Generally between 8 and 12 psi. is where I play
__________________
2005 TJ with a few goodies
amiller is offline   Quote Quick Reply
Old 03-18-2013, 06:23 PM   #7
Jeeper
 
beaureed445's Avatar
 
Join Date: Sep 2012
Location: Oklahoma
Posts: 464
If I'm running 33x12.50's on a 15x10 rim, how far can I go down before it becomes an issue? The last thing I want is to blow a bead because I air down too far.
beaureed445 is offline   Quote Quick Reply
Old 03-19-2013, 08:41 AM   #8
Jeeper
 
DBoat's Avatar
 
Join Date: Jul 2012
Location: The Big D
Posts: 1,435
Thanks for the great responses.. I will look at the width of my 17" rims and get the exact tire size tonight and post up.. however, it looks like I am heading to 10 lbs for this excursion.
on a related note, my buddy Mike and I installed the holders for the CO2 tank last night in the tub of the Jeep. They should work well..
DBoat is offline   Quote Quick Reply
Old 03-19-2013, 08:51 AM   #9
Rock-Rubber

WF Supporting Member
 
GoldenSahara00's Avatar
 
Join Date: Aug 2010
Location: SCPA
Posts: 16,560
12 is good but it depends on the tire compound. My duratracs at 12 and MTR at 8 behave about the same.
__________________
Ryan - A good eye, a light foot, and a smart rig.
Bolt-ons are boring
AMERICAN JEEPER
My Build - http://www.wranglerforum.com/f118/pr...a00-74622.html
Rausch Creek Trip: 2014 Trip Coming Soon
GoldenSahara00 is offline   Quote Quick Reply
Old 03-19-2013, 09:21 AM   #10
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 31,096
Images: 2
Quote:
Originally Posted by beaureed445 View Post
If I'm running 33x12.50's on a 15x10 rim, how far can I go down before it becomes an issue? The last thing I want is to blow a bead because I air down too far.
You should be fine at 12 psi or thereabouts. Some go down a little further with a 10" wide wheel but...
__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 03-19-2013, 05:53 PM   #11
Jeeper
 
DBoat's Avatar
 
Join Date: Jul 2012
Location: The Big D
Posts: 1,435
Wheels are 17x9 tires are 295x70x17s

Dana
DBoat is offline   Quote Quick Reply
Old 03-20-2013, 10:12 PM   #12
Jeeper
 
DBoat's Avatar
 
Join Date: Jul 2012
Location: The Big D
Posts: 1,435
Guess I am going to go to 10 psi and give it a try.. unless I hear from Jerry otherwise..
DBoat is offline   Quote Quick Reply
Old 03-24-2013, 06:40 AM   #13
Jeeper
 
DBoat's Avatar
 
Join Date: Jul 2012
Location: The Big D
Posts: 1,435
Aired down to 11 psi and what a difference. Thank you all for the advice. As an aside, used my new CO2 setup to air back up. All Incan say is W O W. this is the setup for the truly impatient. Took maybe a minute per wheel.
Dana
DBoat is offline   Quote Quick Reply
Old 03-24-2013, 08:08 AM   #14
Jeeper
 
SweetTeaDrinkerTJ98's Avatar
 
Join Date: Feb 2013
Location: Northwestern Pennsylvania, 1 hour away from Erie.
Posts: 144
For the sand we go down to 9-10

__________________
1998 4 banger stock. 31" Mastercraft Courser M/Ts

SweetTeaDrinkerTJ98 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



logo carid shop wrangler parts carid fender flares custom wheels store avs deflectors at carid

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 06:14 AM.



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