Reduced Tire Pressure...What a change! - Jeep Wrangler Forum

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

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on
Old 12-19-2009, 06:14 PM   #1
Join Date: Nov 2009
Posts: 7
Reduced Tire Pressure...What a change!

I have super swamper radial tsl's (36x12.5x16) and went from 30lbs down to 22lbs...let me tell you. Quite a better ride! I'm somewhat of a "nube" to the jeep thing so I pretty much thought the tire pressure would be the same as a passenger car...till i asked someone what i should be running. So would running 22lbs be fine? of course i mostly do regular asphalt driving. (4cyl).
What are you guys running (street) as far as tire pressure)

joel-c is offline   Quote
Old 12-19-2009, 07:10 PM   #2
Atthehop's Avatar
Join Date: Jul 2008
Location: NW, NJ
Posts: 4,034
I have 30x9.5's and run 25. You should be fine. Do you know how to do the chalk test.

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 offline   Quote
Old 12-19-2009, 07:15 PM   #3
Join Date: Nov 2009
Posts: 7
not at all. educate me....
joel-c is offline   Quote
Old 12-19-2009, 07:46 PM   #4
I am JD and it's My Dream

WF Supporting Member
::WF Administrator::
JDsDream's Avatar
Join Date: Jan 2009
Location: The Peach State
Posts: 28,124
Just get a piece of chalk, run it across the tread (side to side) and move the jeep over a piece of even pavement a couple three turns of the tire. If the chalk is worn evenly, your pressure is good.

Worn in the middle of the tire = too much pressure.

Worn on the outer tread - too little.

I have 31's and I run 24 in them.
The kind of woman that when my feet hit the floor each morning the devil says "Oh Crap, She's up!"

To All Of Our Forum Veterans and Active Service Members.
Our Debt To You Is Greater Than We Could Ever Repay.
Thank You

Become a Supporting Member!
JDsDream is online now   Quote
Old 12-19-2009, 07:57 PM   #5
Knows a couple things...

WF Supporting Member
Jerry Bransford's Avatar
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 38,482
Basically you put a few lines of chalk across the tread and drive it a bit to see how evenly the chalk has worn. If the chalk is more worn away on the edges, the tire is underinflated. If the chalk is more worn away in the center, it's overinflated. However, the chalk test isn't as foolproof or all it's made out to be. It can fool some people into underinflating their tires below what they should be.

Like in my opinion, 25 psi is too low of a pressure for radial 30x9.50x15 tires (bias belted tires do well at lower pressures). Heck I run higher than that, 26 psi, in my 35x12.50x15 tires which over two sets of tires has produced absolutely even wear. The factory's recommendation for a 30x9.50 tire on an unloaded Wrangler is more like 31 psi and 33 psi when the Wrangler is fully loaded with people & luggage. That psi is based on the tire's size, load carrying rating, and the weight of the Wrangler. The chalk test alone will often mislead people into underinflating their tires so while it can help (especially where overinflation exists), it shouldn't be the sole indication of what pressure to run.
When you have a choice, buy American.

Jerry Bransford is online now   Quote
Old 12-19-2009, 08:09 PM   #6
nicolas-eric's Avatar
Join Date: Jan 2007
Location: Hamburg, Germany
Posts: 5,893
Send a message via ICQ to nicolas-eric Send a message via AIM to nicolas-eric Send a message via MSN to nicolas-eric Send a message via Yahoo to nicolas-eric
IMO 22 psi isn´t enough for a 30" tire.
nicolas-eric is online now   Quote
Old 12-20-2009, 10:43 AM   #7
HyperBuzzin's Avatar
Join Date: Nov 2009
Location: Western PA
Posts: 642
Originally Posted by joel-c View Post
I have super swamper radial tsl's (36x12.5x16)..... of course i mostly do regular asphalt driving. (4cyl).
36" Swampers for mostly asphalt??
Make them TSL's happy and take 'em off road!!!
'04 TJ Unlimited (The Original Unlimited!!)
2.25"BB, 32" M/T's & Super Swampers for off-road
Where we're goin', we don't need no stinkin' roads!!
HyperBuzzin is offline   Quote
Old 12-20-2009, 12:13 PM   #8
Join Date: Nov 2009
Posts: 7 is a waste by not running them off road! the only "off roading" i've done is the beach !! gotta make more time to play. Thanks for the "chalk" information. I'll atleast try it.

joel-c is offline   Quote

Thread Tools

Posting Rules
You may not post new threads
You may not 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
Looking to change tire size? Read me! 95riogrande YJ Tech Forum 15 09-17-2010 08:19 AM
Faulty Tire Pressure Monitor System RobW Tires & Wheels 16 06-09-2009 08:52 PM
Tire Pressure - Remedial Review innocent bystander TJ General Discussion Forum 22 03-27-2009 11:24 AM
Tire Pressure scotiez General Jeep Discussion 15 04-08-2008 06:35 PM
Tire Pressure jj33002 YJ General Discussion Forum 8 03-26-2006 06:59 PM

Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 08:01 PM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.

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