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Unread 08-24-2013, 07:13 AM   #1
AtlantaCJ7
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Narrow Track - 33x12.5 tires on stock 15x8

I have a 1980 cj7, narrow track, putting a 2.5" bds lift on it, keeping my stock rims, and putting 33x12.5 duratrac tires on it. I am concerned about rubbing, backspacing, flex, and clearance. I don't plan to offroad a lot but I want to trailrun and flex some. I am thinking I may need to put spacers on, and maybe add a 1" body lift. Any thoughts? And pics of rigs with similar setup?

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Unread 08-24-2013, 07:23 AM   #2
Vaquero45
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I don't know how much this will help, but I have a 77 with the narrow track axles. It has a 4 inch lift, 1 inch body lift, and my wheels have 2.5 backspacing. The tires are BFG AT 33x12.5. I don't have any issues with rubbing. I went the low backspacing to help with stability on the road. I felt a noticeable difference in the handling immediately.

Here's a pic.

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Unread 08-24-2013, 07:29 AM   #3
AtlantaCJ7
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Nice! What kind if wheels came with a 2.5 backspacing?
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Unread 08-24-2013, 09:03 AM   #4
jeepdaddy2000
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I believe stock rims are 7". That seems a little narrow for 12.5" tires.
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Unread 08-24-2013, 09:28 AM   #5
jp360cj
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I don't remember the switchover year but in the late 70s the stock size was 15x8, switched to 15x7 sometime in the 80s. I want to say the change coincided with the switch to widetrack axles in 82, but I'm not 100% on that
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Unread 08-24-2013, 09:31 AM   #6
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Quote:
Originally Posted by jeepdaddy2000 View Post
I believe stock rims are 7". That seems a little narrow for 12.5" tires.
I've done it, but only out of neccesity, and it was on WT axles. I probably wouldn't on NT axles....given how much the sidewall bulges on the 7" rim and the fact they will definitely scrub the wheel well. Had a buddy that ran what the OP is suggesting and there was serious rubbing on the inner wheel well (even with a 3" lift).
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Unread 08-24-2013, 09:48 AM   #7
AtlantaCJ7
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They are 15x8, with actual outside dim. Being 9". I believe they switched to 7's later.
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Unread 08-24-2013, 12:22 PM   #8
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I'd be more concerned about the loss of turning radius. Those tires are going to rub on the springs in a tight turn. You can adjust the steering stops to prevent contact with the springs, but you'll notice you can't make a very tight U-turn (a tight switch back may become a 2-point turn). You can resolve some of the problem with wheel spacers or special back spacing, but be aware that will also put more strain on your wheel bearings (in addition to the forces created by bigger tires). Honestly, I think switching to wide-trac axles is the best solution (granted, this is not a cheap or easy fix, but better in the long run).
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Unread 08-24-2013, 12:34 PM   #9
spottedfrog
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You will need less back space, I have 31x10.5 now with NTs and 3" lift. on 15x8.5 and 3.75 BS. and While I have full turning radius now I rum under full compression in the back and And a 12.5 wide tire would rub the springs in front at full turning lock.
I'm going to go with a 33x12.5 soon but will need less back space. your options are either to use spacers or find a low backspace wheel. so far the only 10 wide wheel with a 2.5 back space I an find to fit a CJ is the Pro comp 52:
http://www.procompusa.com/prodDetail...21&plID=100347
I'd go WT if I could get my hands on a set.
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Unread 08-24-2013, 01:07 PM   #10
Vaquero45
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Quote:
Originally Posted by AtlantaCJ7 View Post
Nice! What kind if wheels came with a 2.5 backspacing?
http://www.4x4groupbuy.com/store/bla...bs-p-9273.html

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Unread 08-24-2013, 01:50 PM   #11
spottedfrog
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Originally Posted by Vaquero45 View Post
are your rear wheels flush with the flare? or even poke out a tad?
do you have any dead-on front/back shots to show it?
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Unread 08-24-2013, 03:39 PM   #12
AtlantaCJ7
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Any concern with 2.5" backspacing? Does that put too much strain on the axle or other?
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Unread 08-24-2013, 04:15 PM   #13
spottedfrog
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Quote:
Originally Posted by AtlantaCJ7 View Post
Any concern with 2.5" backspacing? Does that put too much strain on the axle or other?
Probably a tad less than a 2" spacer and you eliminate the spacer as a fail point.
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Unread 08-24-2013, 05:32 PM   #14
Vaquero45
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Quote:
Originally Posted by spottedfrog View Post
are your rear wheels flush with the flare? or even poke out a tad?
do you have any dead-on front/back shots to show it?
The tread is just under the flare. The side of the tires pokes out just a little. I don't have any pics from directly behind but this will give you an idea what it looks like.







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Unread 08-24-2013, 06:06 PM   #15
spottedfrog
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Quote:
Originally Posted by Vaquero45 View Post
The tread is just under the flare. The side of the tires pokes out just a little. I don't have any pics from directly behind but this will give you an idea what it looks like.
Perfect thanks. have you had the suspension fully compressed yet, how is the clearance out back?
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