Quick question about backspacing...... - 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 > Four Wheeling Forums > Wheelin' Neighborhood > South Central USA > Colorado Jeep Forum > Quick question about backspacing......

Rugged Ridge Modular XHD Snorkel Now for both 3.8L and 3.6RIGID LED Light Blowout Sale - All Sizes, All Series, all Introducing MONSTALINER™ UV Permanent DIY Roll On Bed Line

Reply
Unread 07-26-2007, 03:55 PM   #1
stangman68inftc
Registered User
2000 TJ Wrangler 
 
Join Date: Nov 2006
Location: Fort Collins, CO
Posts: 429
Tj Quick question about backspacing......

Hey guys, I've got stock canyons right now on my TJ with 31x10.5 and I have to problems with them except that at full lock, right or left, they rub. So I've been looking around for sometime now for some black steelies and think I've found a good deal on a pair of 15x7's. I called and asked the guy if he knew what the backspacing was on them and he wasn't sure so he measured from the inner edge of the rim to where the wheel bolts to the hub and it was 4.5. First question, this is the correct way to measure backspacing right? Second question, I have heard, but am not positive, that a 12.5 inch wide tire will fit on a 7 inch wide wheel, is this correct? Last question is can I mount a 12.5 inch wide tire on a wheel with 4.5 inches of backspacing and have it not rub while turning? Thanks for the help guys.

__________________
Colorado Jeep Club member #87
stangman68inftc is offline   Reply With Quote Quick reply to this message
Unread 07-26-2007, 03:57 PM   #2
ArloGuthroJeep
Mr. Hyde!
 
ArloGuthroJeep's Avatar
2004 WJ 
 
Join Date: Mar 2005
Location: Boulder, CO
Posts: 23,087
Can't answer your TJ specific questions on rubbing, but generally a 12.5" wide tire wants an 8" wide rim. The only way to know for sure is to visit the tire manufacturers website and check on their list. It'll display the minimum rim width. Too narrow and it'll bow the tire and cause poor tread wear.
__________________
'04 WJ, 6" Clayton LA's, 242 SYE, 35" BFG MT KM2's, 4.56 gears, & D44a locked
'14 WK2 Limited w/5.7L, ORAI, & Tow Package
ArloGuthroJeep is offline   Reply With Quote Quick reply to this message
Unread 07-26-2007, 04:12 PM   #3
KUK9
Registered User
2000 TJ Wrangler 
 
Join Date: Oct 2003
Location: Denver, Colorado
Posts: 3,118
First, yes, that is the correct way to measure backspacing- basically lie the wheel face down, put a straight edge across the wheel, and measure from the outside of the wheel to the mounting surface.

Second, I'm confused a bit. You are saying that you have 10.50 wide tires, but then are jumping to 12.50. Is this just to make sure that in the future if you go larger that you are ok, or is there a typo in there somewhere?

As far as a 12.50 wide tire, I would go with an 8" wide wheel (which is what most people run...some run 10" wide). With an 8" wide wheel, a 12.50 will fit very well, and allow you to air down lower than a 10" wheel without the chances of blowing a bead as easily. You should be able to run a 12.50 on 4.5" and not have it rub...but you might need to go to 4.75".
__________________
REDLYNER Racing #4550

My Build Thread:
http://www.jeepforum.com/forum/f22/adapt-die-kuk9s-stretch-tj-build-1160620
KUK9 is offline   Reply With Quote Quick reply to this message
Unread 07-26-2007, 05:19 PM   #4
stangman68inftc
Registered User
2000 TJ Wrangler 
 
Join Date: Nov 2006
Location: Fort Collins, CO
Posts: 429
Tj

Sorry if I was a bit confusing. I currently am running a 10.5 inch wide tire, and on the stock wheels they rub at full lock. This is the main reason why I want new wheels. However, I am curious about whether or not I would be able to fit a 12.5 inch wide tire on these wheels in the future so that was why I asked about both. I would assume that for now, these 15X7 would be fine for my 31X10.5. After I get my, lift on, I have been thinking about getting some 33X10.5 BFG AT's because they are cost effective, and I would assume don't hit the gas mileage as badly as a 33X12.5. I am not however, set on getting 33X10.5, that's why I was curious about 12.5 inch tires as well. One last question, anyone know of a good inexpensive place, preferably in northern colorado to have my tires mounted on these new wheels assuming I get them? Thanks again guys.
__________________
Colorado Jeep Club member #87
stangman68inftc is offline   Reply With Quote Quick reply to this message
Unread 07-26-2007, 05:27 PM   #5
Shag
Registered User
2000 TJ Wrangler 
 
Join Date: Aug 2006
Location: , CO
Posts: 744
I have the stock canyons as well with 31x10.5 BFG AT's. I was having rubbing issues until I added a couple of washers to the steering stops.
__________________
____________________________________

Shaun
Buy Shag A Lifetime Membership
Quote:
Originally Posted by afbond03
....just need a nice tug it would be really simple to get me from behind just pull me back....
rbowling is a thief. I bought these gears from him, and now I am out my money and still no gears. Do not trust him.
Shag is offline   Reply With Quote Quick reply to this message
Unread 07-26-2007, 07:14 PM   #6
otisdog
Registered User
2003 TJ Wrangler 
 
Join Date: Apr 2005
Location: Aurora Co
Posts: 4,625
12.50's probably would be ok with 4.5" backspacing, however if you could get them with 4" it would be better.
Rubbing when turning full is the least of your worries with too much backspacing - how close the tires are to the upper rear spring perchs is a bigger concern. You don't want to slice up a couple $160 tires. You have to check both sides also because your lift [ trackbar] may be pulling your axle to one side a bit more than the other.
Jim
__________________
03 Sport
otisdog is offline   Reply With Quote Quick reply to this message
Unread 07-26-2007, 10:43 PM   #7
MtnHighTJ
Registered User
1998 TJ Wrangler 
 
Join Date: Mar 2007
Location: Nederland, CO.
Posts: 547
I got some 1.5" wheel spacers for sale $90 shipped, that would take care of the rub.
__________________
[CENTER][/CENTER]5spd Banks Monster exhaust
Dana30 ARB Locker Dana 44 LSD 4.88's
4" Explorer Pro Comp lift
1 1/4 JKS BL Brown Dog 1" MML
RE monos Nasty's Disco's
15"x 8" soft 8's w/ 35"x12.5'' MT Baja MTZ
A to Z sliders. Nth degree oil pan skid
Rokmen gas skid steering skid Warn dif plate
Superwinch EPi 9000
Currie HD Tie rod
BESRK rear bumper w/swing out

Colorado Jeep Club Member #85[INDENT][/INDENT]
MtnHighTJ is offline   Reply With Quote Quick reply to this message
Unread 07-26-2007, 10:45 PM   #8
stangman68inftc
Registered User
2000 TJ Wrangler 
 
Join Date: Nov 2006
Location: Fort Collins, CO
Posts: 429
I know I can just add spacers as far as the rubbing goes, but first of all I'm too lazy, second of all, it's only at full lock and I know it so I can avoid it, third of all, I would rather get some wheels with better backspacing so that I can take full advantage of my turning radius. The main that I haven't put my lift on yet is because I have a feeling my stock wheels will make my tires rub on the spring perches.
__________________
Colorado Jeep Club member #87
stangman68inftc 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.