Let's talk tire pressure - JeepForum.com

 
LinkBack Thread Tools
post #1 of 10 Old 07-20-2013, 10:20 PM Thread Starter
rambo3489
Registered User
1989 YJ Wrangler 
 
Join Date: Feb 2011
Location: Phoenix
Posts: 1,704
Let's talk tire pressure

Alright guys,

Long story short I caused a lot of trouble saying I ran my MTR/Ks at 14 psi. I just got them and that's what the chalk test said to run them at. Gave me full tread contact across the tires. I was then informed the chalk test is not the best tool to use with big tires on proportionally small wheels. OK. So I ran my tires at the PSI range that was suggested to me. (20-24 psi) This picture was with 20 PSI.

Well I just got back from a little light wheeling got some mud on the tires and made an interesting observation. The tires are only contacting on the center as I feared form the start. See:




89 YJ.. My first jeep and I won't let it go. ▀||||▀

Current Project: None... I disgust myself.

<a href="
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
THE YJ MY WAY</a>
rambo3489 is offline  
Sponsored Links
Advertisement
 
post #2 of 10 Old 07-20-2013, 10:24 PM
Anticanman
RIP one good jeeper
 
Anticanman's Avatar
1994 YJ Wrangler 
 
Join Date: Aug 2009
Location: Ripon
Posts: 20,368
That looks ok to me. The way the lugs are shaped, its not supposed to have full tread contact on the pavement all the time.

Luck Favours The Prepared
Anticanman is offline  
post #3 of 10 Old 07-20-2013, 10:35 PM
dillonjm
Registered User
2013 WK 
 
Join Date: Jun 2003
Location: Wichita Falls, TX
Posts: 4,203
Quote:
Originally Posted by Anticanman View Post
That looks ok to me. The way the lugs are shaped, its not supposed to have full tread contact on the pavement all the time.
This.

Looks about right to me.

13 GC Overland - (Wife's DD) 5.7, stock
Past Jeeps: 99TJ, 78CJ7, 91YJ, 01WJ, 03TJ, 05KJ
dillonjm is offline  
post #4 of 10 Old 07-20-2013, 10:40 PM Thread Starter
rambo3489
Registered User
1989 YJ Wrangler 
 
Join Date: Feb 2011
Location: Phoenix
Posts: 1,704
No kidding?! Alright thanks guys

89 YJ.. My first jeep and I won't let it go. ▀||||▀

Current Project: None... I disgust myself.

<a href="
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
THE YJ MY WAY</a>
rambo3489 is offline  
post #5 of 10 Old 07-20-2013, 10:45 PM
dillonjm
Registered User
2013 WK 
 
Join Date: Jun 2003
Location: Wichita Falls, TX
Posts: 4,203
Its going to even out eventually too. But that is about what i run mine at, new(ish).

Granted my WJ needs about 28-30lbs of pressure vs 20. Apples to oranges though, considering tire size, weight, tire load rating, etc.

13 GC Overland - (Wife's DD) 5.7, stock
Past Jeeps: 99TJ, 78CJ7, 91YJ, 01WJ, 03TJ, 05KJ
dillonjm is offline  
post #6 of 10 Old 07-21-2013, 07:13 AM
UltimatE
Resident Audio Guru
 
UltimatE's Avatar
1994 YJ Wrangler 
 
Join Date: Sep 2004
Location: Worcester, Mass
Posts: 7,107
This is how my chalk test ended up. The outside of the tread is also rounded on my KM2s, so there is still some chalk left on the outsides. Nothing to worry about.


-Matt

White '94 YJ Sport
Black '98 ZJ Laredo - 45x60 Surco Rack - 2" Budget Boost, Addco Front Swaybar


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
UltimatE is online now  
post #7 of 10 Old 08-31-2013, 09:20 AM
tom_sprecher
Registered User
1991 YJ Wrangler 
 
Join Date: Dec 2012
Location: Marietta, GA
Posts: 613
I just installed 33 x 12.5 x 15 KM2's. What is a good starting pressure to do the chalk test?

Tom
tom_sprecher is offline  
post #8 of 10 Old 08-31-2013, 09:43 AM
RockWoRM
Registered User
 
RockWoRM's Avatar
2005 LJ Wrangler 
 
Join Date: Mar 2006
Location: Fresno
Posts: 9,279
I think it's pretty safe to say forget the chalk test and just run them in the low/mid twenties... 22-24 and you'll be fine. YJ's are not that heavy and when running meats in the 33-35 flavor on your average 8" rim, that is about the right psi. Off road, drop 'em down to whatever you like. .o2



WRM

'05 LJR, 6sp, RC long arm w/MC 6" coils, 5.13 D44's w/chromo shafts, MetalCloak fenders/sliders/body armor, 37x12.50 MTR's, Warn 9.5, RockHard swing out w/full spare. <><
RockWoRM is offline  
post #9 of 10 Old 08-31-2013, 10:51 AM
Tom95YJ
[] Eye'd Jeep Connoisseur
 
Tom95YJ's Avatar
1999 XJ Cherokee 
 
Join Date: Sep 2004
Location: Salt Lake City
Posts: 9,505
Garage
You guys dont wheel enough, Or your not wheeling properly your lugs are still in great shape, Mine are all cut and chunked from wheeling

'89 YJ The Smurf
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

'99 XJ Black Betty
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Tom95YJ is offline  
post #10 of 10 Old 08-31-2013, 01:26 PM Thread Starter
rambo3489
Registered User
1989 YJ Wrangler 
 
Join Date: Feb 2011
Location: Phoenix
Posts: 1,704
Quote:
Originally Posted by Tom95YJ View Post
You guys dont wheel enough, Or your not wheeling properly your lugs are still in great shape, Mine are all cut and chunked from wheeling
... My picture was taken a week after I completed a frame off build, with a tranny without third gear. Cut me some slack.

89 YJ.. My first jeep and I won't let it go. ▀||||▀

Current Project: None... I disgust myself.

<a href="
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
THE YJ MY WAY</a>
rambo3489 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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 On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome