YJ Wheel Backspacing - JeepForum.com
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post #1 of 30 Old 03-18-2009, 08:43 AM Thread Starter
dbdragracing
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YJ Wheel Backspacing

I have a 1992 Wrangler with new 30x9.50R15 BF Goodrich AT KOs and a stock suspension. I plan on lifting it next year...after the wedding expense is behind me! But right now I plan on adding a set of black steel 15x8 wheels (guy wants to buy my stock wheels!). What backspacing should I get? Pictures would help. Thanks.


1992 Jeep Wrangler 4.0L 5-speed
4" RC lift w/33x10.50 BFG AT KOs
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post #2 of 30 Old 03-18-2009, 08:46 AM
texas_yj
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your stock wheels are most likely 5 1/2" (5" if you have the small steelies) and most people go sith 4 1/2" aftermarkets, you don't need more back spacing if you don't go up to a 33x12.50 or bigger, I ran 31x10.50 on stock rims for a while and never rubbed at all (at lease the springs/frame, fenders a different story )

Sold) 94 YJ, 4.0L 5 sp manual, Hard top, 33/12.50s, 4.10 ring&pinions, Polished D30 w/Aussie front, 8.8 rear w/ LS, 2.5" RC, 2" BL, 5/8" booms, TJ flares, SYE, custom F/R bumpers and rock sliders, 8k winch, dual optimas, HO alt.

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post #3 of 30 Old 03-18-2009, 09:42 AM
Godchsr
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3.5 BS is the best looking by far.

This pic is without my flares on (which I have on now)

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post #4 of 30 Old 03-18-2009, 10:25 AM Thread Starter
dbdragracing
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Are those just 8" wide? Thanks.

1992 Jeep Wrangler 4.0L 5-speed
4" RC lift w/33x10.50 BFG AT KOs
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post #5 of 30 Old 03-18-2009, 10:27 AM
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I am partial to 4" BS but have had 3.75" and 4.5". I also wouldn't go past an 8" wide rim.


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post #6 of 30 Old 03-18-2009, 11:55 AM
spiicytuna
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Not to highjack, but now I am curious....I have been looking at some wheels that are 15 x 8" / 25.4mm offset ... how will this be with 33x12.5 tires?
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post #7 of 30 Old 03-18-2009, 12:59 PM
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That will work fine with 33

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post #8 of 30 Old 03-18-2009, 01:14 PM
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Quote:
Originally Posted by rustywrangler View Post
I am partial to 4" BS but have had 3.75" and 4.5". I also wouldn't go past an 8" wide rim.
I agree. Both my YJ's have 4" BS. I think it works well. This one has 33's
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post #9 of 30 Old 03-18-2009, 02:03 PM Thread Starter
dbdragracing
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Are those 8" wide? Thanks.

1992 Jeep Wrangler 4.0L 5-speed
4" RC lift w/33x10.50 BFG AT KOs
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post #10 of 30 Old 03-18-2009, 03:24 PM
PeteYJTJ
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My YJ has 4" backspace 15x8 currently, and 35s.



Years ago the YJ had 4.75" backspace 15 x 8 on 33s.



My TJ now has 4.75 backspace 15x8 on 30s. It will get 31s when they wear out - it's my DD.



You really can't see much from these angles though. Personally I would stay with 8" wide. I don't like the low backspace wheels (<4") because it sticks the tire out too far, which looks goofy to me, and it puts more stress on your unit wheel bearings also. JMHO.

Good luck
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post #11 of 30 Old 03-18-2009, 03:36 PM
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Quote:
Originally Posted by PeteYJTJ View Post
Personally I would stay with 8" wide. I don't like the low backspace wheels (<4") because it sticks the tire out too far, which looks goofy to me, and it puts more stress on your unit wheel bearings also.
Wait, so 1" (25.4mm) backspacing sticks out MORE than 4" backspacing? I would totally think that it is the other way around if you hadnt said this.
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post #12 of 30 Old 03-18-2009, 03:40 PM
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We've got 33 x 12.5's w/ 4" backspacing on the same 15x8 rims as Pete's black D's above. Look great and perform well. We tried to reuse the factory aluminum rims, but the backspacing (5.5 I think) was too deep, couldn't get the steering wheel to turn fully w/o hitting the sway bar. And no, we're not pulling the sway bar just yet, maybe down the road, but not yet, son is too young behind the wheel.
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post #13 of 30 Old 03-18-2009, 03:42 PM
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Quote:
Originally Posted by spiicytuna View Post
Wait, so 1" (25.4mm) backspacing sticks out MORE than 4" backspacing? I would totally think that it is the other way around if you hadnt said this.
The difference is between POSITIVE and NEGATIVE backspacing. While not a Jeep site, this link explains backspacing and offset rather well. http://www.chevellestuff.com/tech/wheel_offset.htm

A positive 25.4mm is 1" further IN towards the truck. A negative 25.4mm is 1" further OUT from the truck.
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post #14 of 30 Old 03-18-2009, 03:51 PM
PeteYJTJ
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Quote:
Originally Posted by Rproject View Post
The difference is between POSITIVE and NEGATIVE backspacing. While not a Jeep site, this link explains backspacing and offset rather well. http://www.chevellestuff.com/tech/wheel_offset.htm

A positive 25.4mm is 1" further IN towards the truck. A negative 25.4mm is 1" further OUT from the truck.
Technically, the correct terminology is positive and negative OFFSET. Backspacing is usually a positive value. I don't think I've seen or heard of a "negative backspace" wheel.

To answer the question - yes, a 5" backspace sticks out LESS than a 3.5" backspace. Think of backspace as the distance from the MOUNTING SURFACE of the hub to the BACK of the wheel. So a 5" backspace would have the back of the wheel 5" inside the hub surface, while a 3.5" backspace would only be 3.5", making the wheel stick out more.

Pete

88YJ:SOA/locked/35s/Superwinch=Wheeling Jeep.
04WJ:4.0/3"+10mm/Superwinch=DD & Expedition Jeep.
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post #15 of 30 Old 03-18-2009, 03:52 PM
spiicytuna
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Quote:
Originally Posted by Rproject View Post
The difference is between POSITIVE and NEGATIVE backspacing. While not a Jeep site, this link explains backspacing and offset rather well. http://www.chevellestuff.com/tech/wheel_offset.htm

A positive 25.4mm is 1" further IN towards the truck. A negative 25.4mm is 1" further OUT from the truck.
Okay that makes sense. So a 15x8 with positive 1" of backspacing will be closer to the truck. Will this work with 33's, or look stupid, or?
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