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Old 07-19-2011, 03:41 AM   #1
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Wheel experts: need some help with custom wheels for my 2012 JKU.

I'm dizzy from trying to figure out all the sizes and back spacing etc, so I thought I'd reach out to the experts to get some advice.

I'm having some custom wheels made for my 12' Sahara JKU that will take 4-6 weeks to been made.

I need help on figuring out the correct backspacing and the right width for them so I can get them on it right away since my rig will be here in 10 days...or so the site says.

Here's what I'm planning on running with thus far...

16" wheel with BFG All-Terrain 265/75 R16 rubber.

So what backspacing and wheel width do I need with this setup so I don't need to worry about rubbing and spacers?

I would prefer the tires to sit in a bit and NOT be flush to the edge of the flare, and something that would allow me to go with a larger tire in the future if I'd like.

Thank you kindly in advance!

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Old 07-19-2011, 06:10 AM   #2
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A smaller than stock tire? Why?

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Old 07-19-2011, 07:12 AM   #3
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Also--you can't have it both ways. If the tire sits inside and underneath the fender (as does the stock set up), you won't be able to go much (if any) larger than a stock size. For larger tires, you need wheels that put part of the tires out beyond the fenders.
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Old 07-19-2011, 07:48 AM   #4
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I'm definitely no expert, but if I compare this with my tires (stock "rubi" bfg MTs on 17 inch Moabs), your tire is slightly smaller in diameter by about .4 inches, but your tire is slightly wider (also by about .4 inches). My tire is inside the fender on the stock wheel with 5.5 inches of backspacing.** So, I think if you went with the stock b.s. you would be about flush with the fender.

**I'm not 100% sure about the stock backspacing. I found that spec on Quadratec for the Mopar moab rims.

Like MTH said you are going to have to make a choice: Do you want it inside the fender or do you want "room to grow"? . If you want room to grow then you might consider 4.5 inch backspacing.
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Old 07-19-2011, 07:48 AM   #5
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I've been pondering wheel fitment for a week or two myself. What I've been looking for is a 17x9 wheel with the stock backspacing. Haven't found one yet that doesn't look like it belongs on an Excalade on the north side. What happened to all the nice looking wheels? Anyway, keeping the stock backspacing means the tire won't rub on the inside, but it also moves the face of the wheel 1.5" out which you don't want, but I think you're stuck with to go wider.
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Old 07-19-2011, 01:00 PM   #6
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Thanks for the input!

What about a 275/70 R17 BFG AT KO with a 17"x7.5" wheel with 5" backspacing?

I want to achieve an old school tall skinny tire look...
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Old 07-19-2011, 01:09 PM   #7
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A tire with a 275 section will never achieve a tall skinny look unless it's 4 feet tall. It will also bulge out almost 2" on each side giving the illusion that it's even wider than it really is. If you want old school tall and skinny you should look at something like a 245/75/17 or a 33x10.5x17. Neither of those are particularly tall and skinny, but they may be as close as you can get.
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Old 07-19-2011, 02:50 PM   #8
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Quote:
Originally Posted by PBandJeep View Post
Thanks for the input!

What about a 275/70 R17 BFG AT KO with a 17"x7.5" wheel with 5" backspacing?

I want to achieve an old school tall skinny tire look...
Try BFG KM2--255/80/17 33.3 in tall /10 in wide and no rubbing
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Old 07-19-2011, 04:19 PM   #9
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Quote:
Originally Posted by oilwell1415 View Post
A tire with a 275 section will never achieve a tall skinny look unless it's 4 feet tall. It will also bulge out almost 2" on each side giving the illusion that it's even wider than it really is. If you want old school tall and skinny you should look at something like a 245/75/17 or a 33x10.5x17. Neither of those are particularly tall and skinny, but they may be as close as you can get.
245/75 17 are the stock tyre for us, what do you guys get?

Our rims are 17/7.5 in with 6in backspace. On these stock rims we can fit 265/70 17's with no rubbing, 275/70 17's with minor rubbing on some vehicles, 285/70 17's with noticeable rubbing on all vehicles. To fit 285's without rubbing requires maximum 5" backspace, less is desirable. Also the larger the tyre diameter, the more chance it will hit sway bar at full lock, so a 33 in stock width will be very close to hitting, a 35 at stock width will hit and requires the lesser backspace.

Also, double check with your dealer on the front discs, it was my understanding the '12 world wide would have the 13in front discs they chucked into the '10 models down here. Bottom line there are very very few 16in rims that will fit over the calipers.

This is a diagram of the stock rims we get down here (we only get one size, no options):

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Old 07-19-2011, 07:14 PM   #10
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We get 255/75/17 on the Sport S.
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Old 07-19-2011, 09:52 PM   #11
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Originally Posted by SeaComms View Post

Also, double check with your dealer on the front discs, it was my understanding the '12 world wide would have the 13in front discs they chucked into the '10 models down here. Bottom line there are very very few 16in rims that will fit over the calipers.
Ah man, can anyone confirm this yet? That would be a major bummer if I had custom wheels made and they end up not fitting.
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Old 07-19-2011, 10:18 PM   #12
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In the States, plenty of 2010s have 15" alloy wheels, no shaving required. They don't all fit, but many do. I can't speak to the 2012s.
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Old 07-19-2011, 10:18 PM   #13
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Most get these as standards for after market wheels. It is based on width. A 9" wide wheel needs 5" bs, 8.5 needs 4.75", 8 needs 4.5, 7.5 needs 4.25"

The reason the backspace is different for wheel width is because the tire will baloon over a small width will then a larger one

So a 9" wheel with a 10" tire, the tire adds 1/2" to the backspacing so 5" bs with .5" tire overhang gives you 5.5" back past the surface of the hub

While a 8" wheel with the same 10" tire will hang over 1" each side of the wheel. So you need 4.5" backspace with 1" over hang, gives you a total of 5.5" back past the surface of the hub

So a 9" wheel with a 5" bs after accounting for tire overhang is the same as a 8" wheel with 4.5" bs.
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Old 07-19-2011, 10:44 PM   #14
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Again, I appreciate all the help.
I think I'm going to have suck it up and be patient.

I'm going to wait till it arrives and do it right, so i can make sure I don't F it up.

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