Reply
 
Thread Tools Display Modes
Old 08-08-2012, 08:43 AM   #1
Member
 
Join Date: Mar 2011
Posts: 80
tire pressure question

The tires I have on my Cherokee have printing on them that says a maximum of 65 psi when cold. I assume they mean that is the pressure to set it at from the start when the camper has been sitting for awhile. I ask this because prior to my last camping trip I had indeed set my tires to that pressure. When I returned home (120 mile trip) I noticed a obvious abnormal bulge in the side wall of one of the tires that disappeared as the tire cooled. Who knows how long this has been going on. The tires are Carlisle Radial Trail tires 225/75R15. I plan to replace the tire. Is the pressure right of 65 right?
__________________

__________________
kjoh75 is offline   Reply With Quote
Old 08-08-2012, 08:47 AM   #2
Site Team - Lou
 
Herk7769's Avatar
 
Join Date: Oct 2009
Location: South Eastern PA
Posts: 21,157
Yes sir.

65 is correct for your OEM tire. They are sized to just support the max gross weight of your camper with very little room for "over loading."

A bulge in a sidewall is an indication of a belt separation.
Time for new tires (in my opinion), before a sidewall failure leaves you on the side of the road with camper damage.
__________________

__________________

Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW
Herk7769 is offline   Reply With Quote
Old 08-08-2012, 08:51 AM   #3
Senior Member
 
Great Horned Owl's Avatar
 
Join Date: Feb 2012
Location: Lake County, Illinois
Posts: 301
That is the MAXIMUM cold pressure that the tire can handle. It is not necessarily the pressure that you should set. There should be a (probably yellow) label on the left side of the rig that has weight ratings and tire pressures.

Joel
__________________
2011 Silverado 2500HD Duramax, 4x4, crew cab, long bed
Palomino Puma 253-FBS, 27' 5th wheel
1994 19' Class B on Chevy chassis
Great Horned Owl is offline   Reply With Quote
Old 08-08-2012, 08:52 AM   #4
Site Team - Lou
 
Herk7769's Avatar
 
Join Date: Oct 2009
Location: South Eastern PA
Posts: 21,157
Quote:
Originally Posted by Great Horned Owl View Post
That is the MAXIMUM cold pressure that the tire can handle. It is not necessarily the pressure that you should set. There should be a (probably yellow) label on the left side of the rig that has weight ratings and tire pressures.

Joel
Thanks Joel, you are correct. I would be surprised, though, if the yellow sticker had a different pressure that the max for the tire.
__________________

Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW
Herk7769 is offline   Reply With Quote
Old 08-08-2012, 10:12 AM   #5
Member
 
Join Date: Mar 2011
Posts: 80
My Cherokee is a 2005 27L (second owner). I do not see a yellow sticker on it to give me this psi number. I have dual axles. I have already replaced 2 of the Carlisle Radial Trail tires last summer. I hit something on the road and blew one tire. I replaced with my spare but experienced a second flat on the same side 20 minutes later. Must have damaged it but not to point of it blowing at the same time. Not a good day to say the least. Not knowing I purchased a Goodyear Marathon (Walmart) for one and the second tire I believe is a Commadore (regular tire store).

Currently the Commadore is sitting as a spare. Riding on three Radial Trail tires and one Marathon.

Joel, you suggested that this psi number (65 psi when cold in my case) is the maximum the tire can handle. I know has the tires heat up the pressure will increase. Should I be getting into the habit of setting the pressure 5-7 pounds below this cold number????

I found Commadore tires (load D, 2 steel belts, 10 ply) at my local NTB tire store. Do these have a better then average reputation
__________________
kjoh75 is offline   Reply With Quote
Old 08-08-2012, 10:24 AM   #6
Senior Member
 
jimh's Avatar
 
Join Date: Jul 2010
Location: Lake Charles, La.
Posts: 1,531
look on the inside of the kitchen cabinet and see if the tire cold pressure is repeated. my tag on the outside is blank from the elements.
cold pressure is just that. the tire should be inflated to trailer recommended rate when cold. they will build pressure when heated but that is not ur reference pressure.

when u replace, u may want to consider a LT tire with smooth outer tread (believe they call it a closed rib pattern, they squirm less)...the LT's are the same tire w/more stringent testing.
sense ur inflation pressure is greater than 60, u want the metal high pressure stems. the rubber ones tend to crack. i actually had one break off.
__________________
jimh is offline   Reply With Quote
Old 08-08-2012, 10:45 AM   #7
Mod free 5er
 
Join Date: Mar 2008
Location: Concord, NC
Posts: 24,215
Quote:
Originally Posted by jimh View Post
...the LT's are the same tire w/more stringent testing...
Not quite correct, the ST tires are designed different in the way the plys are positioned inside the carcass. They are designed for rolling and twisting and the LT's are designed for pulling, stopping & turning. Two different animals, but the LT's will work, just not as good IMO.
__________________
OldCoot is offline   Reply With Quote
Old 08-08-2012, 11:04 AM   #8
Senior Member
 
Join Date: Jul 2012
Posts: 1,258
If you have already blown one Carlisle, and another has a bulge in it, I would replace them all asap. I have never heard of Commadore tires, but a simple google search with 'commadore tire failure' should get you something.
If the Goodyears are D-rated, that might be a safe bet.
You can run the tires at 65 psi cold, but the D-rated tires have lots of load capacity. My camper doesn't come close to loading the tires, so I run mine at about 58-59 psi cold, which puts them right in the 64-65 psi range on the road.
Everyone has their own opinion, nothing is written in stone.
__________________
bakken is offline   Reply With Quote
Old 08-08-2012, 11:58 AM   #9
Junior Member
 
Join Date: Sep 2011
Location: Welland Ontario Canada
Posts: 8
A lot of my friends have had tire trouble. All used tires manufactured for trailers. I have LT tires on my present 5th and my previous 5th. Never a problem. I would never use a trailer tire.
__________________
murph164 is offline   Reply With Quote
Old 08-08-2012, 12:16 PM   #10
Senior Member
 
jimh's Avatar
 
Join Date: Jul 2010
Location: Lake Charles, La.
Posts: 1,531
the st and lt are designed the same. no difference in side roll. the difference is the higher speed rating and temp rating of the lt. the st has a higher weight rating with less reserve. the lt has a greater reserve. the st doesn't require the more stringent testing because a failure on it is not considered life threatening.

i've been told the larger trailers come with LT but i am unable to varify that (the trailers i looked at had ST). i did notice that a couple of tires and rims that i purchased from a trailer supply were both LT (much to my surprise). the st is also not to exceed 65 mph. if i can find the links, i will be happy to supply them.
__________________

__________________
jimh is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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



» Virginia Campgrounds

Reviews provided by




ForestRiverForums.com is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 06:35 AM.