off size spare? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > TJ Wrangler Technical Forum > off size spare?

XJ Rail Sale!The Ruffstuff NOT Universal 4 Link Kit!Vanco Big Brake Kit Promotion!

Reply
Unread 07-15-2007, 09:26 AM   #1
monkeychrist
Registered User
1998 TJ Wrangler 
 
Join Date: Jun 2007
Location: New Hampshire
Posts: 225
off size spare?

Hello,
I got a deal on 4 31x10.5-15's for the jeep. The fifth tire, the spare, is a stock 30. Is it still usable as a spare, just for emergency purposes, or will it cause too much tilt?

__________________
Quote:
Originally Posted by athos76 View Post
...but one day while driving, I heard a twang and saw a little orange bungee go shooting off into traffic...
monkeychrist is offline   Reply With Quote Quick reply to this message
Unread 07-15-2007, 09:43 AM   #2
marc1kim
Registered User
2005 LJ Wrangler 
 
Join Date: Jul 2007
Location: South Texas
Posts: 352
If you've got limited slip axles it's not recommended to have two different size tires.
marc1kim is offline   Reply With Quote Quick reply to this message
Unread 07-15-2007, 11:17 AM   #3
Scotch740
Registered User
2005 LJ Wrangler 
 
Join Date: Apr 2004
Location: Charlottesville VA
Posts: 2,328
If you only have a LSD in one axle you can always swap the 30 to the open axle. Other than that you will be fine.

Edit: The problem is not the tilt, which you probably won't even notice. It is that one shaft will be turning more than the other. With a LSD or a locker they will be locked together and it will cause big problems.
Scotch740 is offline   Reply With Quote Quick reply to this message
Unread 07-15-2007, 11:26 AM   #4
SGT Superman
Registered User
2000 WJ 
 
Join Date: Aug 2005
Location: Lacey, WA
Posts: 377
I hate to see people driving around with a stock spare. Like the others said, if you dont have lockers or a limited slip you will be fine for an emergency, but please get a full size on there soon.
__________________
Now you know, and knowing is half the battle. G.I. Joe!
Green Jeep Club Member #174
GO COUGS!
SGT Superman is offline   Reply With Quote Quick reply to this message
Unread 07-15-2007, 11:32 AM   #5
bairy
Registered User
2006 LJ Wrangler 
 
Join Date: Aug 2006
Location: Murrieta CA
Posts: 1,370
I wonder what the rolling diameter change is on a fully aired up 30, compared to an aired down 31
__________________
2006 LJ Claytonized
1999 TJ stockish
1987 J20
bairy is offline   Reply With Quote Quick reply to this message
Unread 07-15-2007, 11:38 AM   #6
Jerry Bransford
Administrator
 
Jerry Bransford's Avatar
2004 TJ Wrangler 
 
Join Date: Jan 2003
Location: Escondido, California, California
Posts: 60,723
Quote:
Originally Posted by bairy
I wonder what the rolling diameter change is on a fully aired up 30, compared to an aired down 31
Tire diameters don't change like balloon diameters do when air pressures are varied. The circumference changes such a small amount after being aired down to be totally inconsequential.
__________________
Getting Savvy...

Coolest offroad magazine ever! CRAWL Magazine

When you have a choice, buy American.
Jerry Bransford is offline   Reply With Quote Quick reply to this message
Unread 07-15-2007, 11:41 AM   #7
monkeychrist
Registered User
1998 TJ Wrangler 
 
Join Date: Jun 2007
Location: New Hampshire
Posts: 225
cool, thanks guys. The 31's are just to last long enough until i can do the lift and 33's all at once. The stock 30's were bald when I got the jeep and like I said, got a good deal on the 31's, but it was only for four of them.
__________________
Quote:
Originally Posted by athos76 View Post
...but one day while driving, I heard a twang and saw a little orange bungee go shooting off into traffic...
monkeychrist is offline   Reply With Quote Quick reply to this message
Unread 07-15-2007, 05:21 PM   #8
98greentj
Registered User
1998 TJ Wrangler 
 
Join Date: Sep 2006
Location: Central Wisconsin
Posts: 46
it's only a half inch, it won't matter
98greentj is offline   Reply With Quote Quick reply to this message
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.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
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


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.