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Old 04-01-2012, 08:47 AM   #1
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Back Spacing

Can anyone tell me if a 5" back spacing will work with my 35X12.50 17's without rubbing? Right now I have GY Fierce Attitude MT's on a 4" Rough country lift with stock wheels and the rear tires are just slightly rubbing the lower control arms. I know the preferred back spacing is 4.5 but does a half inch make that much difference?

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Old 04-01-2012, 08:54 AM   #2
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Quote:
Originally Posted by Crazyi View Post
Can anyone tell me if a 5" back spacing will work with my 35X12.50 17's without rubbing? Right now I have GY Fierce Attitude MT's on a 4" Rough country lift with stock wheels and the rear tires are just slightly rubbing the lower control arms. I know the preferred back spacing is 4.5 but does a half inch make that much difference?
If your tires are "just slightly rubbing the lower control arms", you'll move them out about 1.25" by going to wheels with 5" backspacing. If that'll fix the problem, then they'll work, but only for your current setup.

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Old 04-01-2012, 09:00 AM   #3
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I'm actually very shocked that that is the only contact you are getting. Typically a tire that wide on stock wheels (6.25" backspacing) results in all kinds of contact including front swaybar, read end links, etc.

Like wolf said, you would be moving out 1.25" from stock, so that should clear up some issues.
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'11 JKU Sport - TF Leveling Kit - 16" Strike 5s on 33s
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Old 04-01-2012, 09:01 AM   #4
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I'm actually very shocked that that is the only contact you are getting. Typically a tire that wide on stock wheels (6.25" backspacing) results in all kinds of contact including front swaybar, read end links, etc.
Shocked, as well. In fact, had to read the post through a couple of times to be sure I wasn't missing something. Hmmm. Definitely not the norm.
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Old 04-01-2012, 09:06 AM   #5
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Thanks guys for your help I've found some wheels I kinda like in a 4.5 but all the ones I really like are 5's. But there is all kind of room in the front with stock just not in rear. I'll try to post some pics but I'm new to WF so bear with me.
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Old 04-01-2012, 09:09 AM   #6
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Quote:
Originally Posted by Crazyi
Thanks guys for your help I've found some wheels I kinda like in a 4.5 but all the ones I really like are 5's. But there is all kind of room in the front with stock just not in rear. I'll try to post some pics but I'm new to WF so bear with me.
Did you do the lift and tires after purchase, or did you buy it like that? Wondering if it has wheel spacers.
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Old 04-01-2012, 09:16 AM   #7
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No I bought the jeep stock and did the lift myself in the backyard. No spacers.
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Old 04-01-2012, 09:27 AM   #8
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Here are some pics of the jeep itself I'll take some of the lift an suspension
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Old 04-01-2012, 09:35 AM   #9
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Notice the rear tires touching the control arms
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Old 04-01-2012, 09:41 AM   #10
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Tight! JMO, but I'd go with the 4.5" bs on the aftermarket wheels. Just in case you ever decide to change something on your lift. 5" of backspacing still seems a little close to me...though it'll probably work.

Nice looking Jeep.
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Old 04-01-2012, 09:44 AM   #11
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Yea it's pretty darn tight probably would be a good idea to go with 4.5's just not a huge selection of black wheels in that BS but better safe then sorry
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Old 04-01-2012, 10:23 AM   #12
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Which wheels are you liking inparticular? I find far more 17" wheels in 4.5 than 5".

That being said, a 17x9 wheel with 5" backspacing would be the same as a 17x8 wheel with 4.5" backspacing. Both would have an offset of 0 so the tire wouldn't move regardless of which wheel you put on, despite the backspacing being a bit different.
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Old 04-01-2012, 11:32 AM   #13
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I was looking at the 17X9 XD Crank it has a 5" but I'm confused on why it wouldn't move from a 17x8 to a 17X9
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Old 04-01-2012, 04:15 PM   #14
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Quote:
Originally Posted by Crazyi
I was looking at the 17X9 XD Crank it has a 5" but I'm confused on why it wouldn't move from a 17x8 to a 17X9
Several folks running the cranks without issue.

Regarding the 17x8 vs 17x9; if the offset on both is 0, then the tire won't move, regardless of which wheel you go with. It will have less bulge with the 17x9, but the tires position under the fender will not change.
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Old 04-01-2012, 05:42 PM   #15
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Forget about backspace it is the worse form of measurement you can use. Each wheel can have a different backspace and work depending on the width of the wheel

As long as you have 0 offset the wheel will be fine.

4.5bs only applies to 8" wide wheels like 17X8

5" bs is perfectly fine for 9" wide wheel or larger like 17X9

---------------------------------------------------------------------------
Here is a guide I wrote up for someone else:

15" wheel need at least 3.75" bs so not to rub caliper no matter how wide the wheel

16" wide wheels need at least 4.25" bs for the same reason as above

That applies to alloy and some steel but there can be exceptions. Most steel 15" will not fit.

17" and larger wheel need the following for 315 mm or 12.5" tires

7.5" wide wheels need 4.25 bs
8" wide wheels need 4.5" bs
8.5" wheel need at least 4.75 bs
9" wide wheels need 5" bs
9.5" needs 5.25" bs
10" need 5.5" bs
10.5 need 5.75" bs
11" Not recommended needs 6" bs.

All these are 0 offset but you can use less offset of -12 or -19 but the tire will stick out further past the fender with these offsets
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Old 04-01-2012, 06:00 PM   #16
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That is very helpful and I'm glad to hear the Cranks will work. I plan to order them in the morning and will post a pic when they get put on. Thanks
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Old 04-01-2012, 08:40 PM   #17
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I have 17" X 9" CRANK wheels on my Arctic. Used the stock size Rubicon tires. NO rubbing anywhere.
Love the wheels.

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Old 04-01-2012, 08:50 PM   #18
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Nice! 👍👍
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Old 04-01-2012, 09:07 PM   #19
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Quote:
Originally Posted by rics1997
15" wheel need at least 3.75" bs so not to rub caliper no matter how wide the wheel

16" wide wheels need at least 4.25" bs for the same reason as above
Actually, there are some 15" wheels that can have more than 3.75" backspacing and still work. An example would be the Black Rock 909, which has 4" backspacing.

16" wheels can have more than 4.25" as well. The 16x8.5 Level 8 Strike 5s which I run have 4.5".

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'11 JKU Sport - TF Leveling Kit - 16" Strike 5s on 33s
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