air pressure - Jeep Commander Forums: Jeep Commander Forum
Wheels / Tires This section contains discussion about wheels and tires for your Jeep Commander.

 
LinkBack Thread Tools Display Modes
post #1 of 10 (permalink) Old 04-21-2011, 06:39 PM Thread Starter
Junior Member
Points: 241, Level: 4 Points: 241, Level: 4 Points: 241, Level: 4
Level up: 82% Level up: 82% Level up: 82%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Dec 2010
Posts: 2
air pressure

I have a set of goodyear duratrec on my 08 commander . How much air should i put in these tires for everyday street use. The sidewall says max 80 psi i've got mine at 55 psi any help would be great thanks
twomad is offline  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old 04-21-2011, 07:09 PM
Senior Member
Points: 9,538, Level: 65 Points: 9,538, Level: 65 Points: 9,538, Level: 65
Level up: 63% Level up: 63% Level up: 63%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Dec 2010
Location: Lisle, IL
Own a Commander?: Yes
Model year: 2007
Trim Package: Overland
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 126000
Posts: 417
Waaay too much!!

Always go by the psi listed on your door jamb. I forget off hand, but it should be 32-36psi. The psi goes up as your tires get hotter. You should probably make sure it never goes over 40psi hot. Always fill to the recommended psi when tires are cold and you might do a little extra to save a bit of gas.

If you off road, you can put them as low as 20psi and still be safe.

Good luck and welcome.


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


2007 Overland with all the options (including boulder-kissed bumper)
Bobula is offline  
post #3 of 10 (permalink) Old 04-21-2011, 07:34 PM
Moderator
Points: 10,821, Level: 68 Points: 10,821, Level: 68 Points: 10,821, Level: 68
Level up: 93% Level up: 93% Level up: 93%
Activity: 0% Activity: 0% Activity: 0%
 
SAL-XK's Avatar
 
Join Date: Apr 2010
Location: North Carolina
Posts: 1,993
The door jam is a good place to start getting your PSI set. When using tires and sizes Jeep never intended you to put on makes it a little harder then what the sticker states. Also 20PSI on my tires would hardly do me any good I have to air down to 15PSI to get some decent flex. I started at 20PSI and tested it and kept walking them down to see what works for me. The same with airing up you're going to have to check measure and pay attention to what the tire is doing wearing and sitting. My Bighorn MT's are wearing perfectly at 40PSI even wear side to side no issues.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Stop by and like the page

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


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


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


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
SAL-XK is offline  
 
post #4 of 10 (permalink) Old 04-21-2011, 08:21 PM
Senior Member
Points: 4,992, Level: 45 Points: 4,992, Level: 45 Points: 4,992, Level: 45
Level up: 21% Level up: 21% Level up: 21%
Activity: 0% Activity: 0% Activity: 0%
 
Smitty1970's Avatar
 
Join Date: Feb 2009
Location: Palmyra , Va.
Posts: 1,096
I run my Duratracs at 35 psi. i have had them for a year now, rotate them every 6K and keep it aligned and they are wearing perfectly.

American by birth, Southern by the grace of God.
Smitty1970 is offline  
post #5 of 10 (permalink) Old 04-21-2011, 09:05 PM
Senior Member
Points: 8,101, Level: 60 Points: 8,101, Level: 60 Points: 8,101, Level: 60
Level up: 76% Level up: 76% Level up: 76%
Activity: 0% Activity: 0% Activity: 0%
 
Matt_'s Avatar
 
Join Date: Jun 2010
Location: NJ
Posts: 1,128
For almost ANY tire that will fit a Commander, 35-40 will work. Anything over 40 is usually overkill unless you're fully loaded. 55 is too much.

Here's a thread I created with a bit more detail on how to figure out tire pressures: http://www.xk-forum.com/showthread.p...-tire-pressure

Cliff Notes: You find out the load capacity of your vehicle by using the OEM tire capacities OR the GAWR (Gross Axle Weight Ratings), either works, then use the Load Vs. Inflation charts published by the North American Tire & Rim Association to find out what PSI you need to run your new tires to match the OEM capacity.

-Matt
Matt_ is offline  
post #6 of 10 (permalink) Old 04-22-2011, 02:14 AM
Senior Member
Points: 7,761, Level: 59 Points: 7,761, Level: 59 Points: 7,761, Level: 59
Level up: 6% Level up: 6% Level up: 6%
Activity: 0% Activity: 0% Activity: 0%
 
USMCMP's Avatar
 
Join Date: Nov 2008
Location: Wisconsin
Posts: 696
I thought you always put 3 less than the manufacturers suggested PSI? It doesnt matter what it says on the door if the door is for the stock tires. Are you sure it is 80psi? 80 is a lot. It all depends on ride comfort, wear, handling, and gas mileage. I would not run a tire at half what it is supposed to be at but I do not think they are supposed to be ran at 80 PSI either. check again.

'06 HEMI LIMITED LOADED QDII DE-BADGED, TINT, SILVERSTAR ULTRAS, LED TAILS, R/C LIFT, BILSTEINS, KMC XD HOSS WHEELS, DURATRACS, MAGNAFLOW, K&N CAI and OIL FILTER, ROYAL PURPLE, HAWK HPS PADS, RED CALIPERS, LEDs BEHIND GRILLE

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
USMCMP is offline  
post #7 of 10 (permalink) Old 04-22-2011, 05:46 AM
Senior Member
Points: 8,101, Level: 60 Points: 8,101, Level: 60 Points: 8,101, Level: 60
Level up: 76% Level up: 76% Level up: 76%
Activity: 0% Activity: 0% Activity: 0%
 
Matt_'s Avatar
 
Join Date: Jun 2010
Location: NJ
Posts: 1,128
The tire manufacturers don't suggest a PSI, they only give a MAX PSI.

The auto manufacturers suggest a PSI based on vehicle weight and load capacities. So you want to match the auto manufacturers tire capacity with the new tires.

-Matt
Matt_ is offline  
post #8 of 10 (permalink) Old 04-22-2011, 08:06 AM
Senior Member
Points: 4,992, Level: 45 Points: 4,992, Level: 45 Points: 4,992, Level: 45
Level up: 21% Level up: 21% Level up: 21%
Activity: 0% Activity: 0% Activity: 0%
 
Smitty1970's Avatar
 
Join Date: Feb 2009
Location: Palmyra , Va.
Posts: 1,096
I had my tires and rims shipped mounted and balanced. they were inflated to 80psi. This is MAx Psi as stated on sidewall. No way would you want to run them at 80.

American by birth, Southern by the grace of God.
Smitty1970 is offline  
post #9 of 10 (permalink) Old 04-22-2011, 08:47 AM
Senior Member
Points: 8,101, Level: 60 Points: 8,101, Level: 60 Points: 8,101, Level: 60
Level up: 76% Level up: 76% Level up: 76%
Activity: 0% Activity: 0% Activity: 0%
 
Matt_'s Avatar
 
Join Date: Jun 2010
Location: NJ
Posts: 1,128
Quote:
Originally Posted by USMCMP View Post
I would not run a tire at half what it is supposed to be at but I do not think they are supposed to be ran at 80 PSI either. check again.
There is absolutely nothing wrong with running a C, D or E rated tire at 35 PSI (EDIT: when used in the proper application.). Remember, 80psi is not "what its supposed to be run at", That is just the absolute maximum pressure.

The TRA (Tire and Rim Association) has published data stating what pressures LT tires are actually "supposed" to be run at for given loads. And yes, they all have acceptable ratings down to 35 psi; most of which have a load capacity more than adequate for our vehicles at those pressures.

This isn't conjecture. .... its actually the proper method for determining tire pressure.

It should also be noted that there are also manufacturer warnings against LT tires in some applications where the required pressure (per the TRA) is actually too high for the vehicle and thereby decreases contact patch. This is normally reported as a crappy ride by users, but what most don't realize is that also translates into reduced traction, reduced handling and longer stopping distances. Being over inflated is a big problem, and people running 50, 60 or even 70 psi in vehicles that should only have 40-45 max when fully loaded is not good. Also, any "MPG" benefits of running over inflated tires are quickly counter acted by increased tire wear, wear&tear on vehicle suspensions and reduced safety. If you want better MPG, get LRR tires and run the proper tire pressures.... not E rated tires at 70 PSI. (Edit2: Not that anyone here has recommended this.... just a blanket statement )

-Matt

Last edited by Matt_; 04-22-2011 at 09:46 AM.
Matt_ is offline  
post #10 of 10 (permalink) Old 04-22-2011, 08:00 PM Thread Starter
Junior Member
Points: 241, Level: 4 Points: 241, Level: 4 Points: 241, Level: 4
Level up: 82% Level up: 82% Level up: 82%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Dec 2010
Posts: 2
Thanks for the replys and after reading all of this info i will be lowering my air pressure. When i bought the tires they were at 80 psi and then at last oil change they were set at 32psi and the goodyear store that i bought them at had no clue. thanks again were all the help
twomad is offline  
Sponsored Links
Advertisement
 
Reply

  Jeep Commander Forums: Jeep Commander Forum > Jeep Commander Discussion > Wheels / Tires

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Jeep Commander Forums: Jeep Commander 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:
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:
OR

Log-in











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
Display Modes
Linear Mode Linear Mode



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 On
Pingbacks are On
Refbacks are On

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