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Old 02-28-2013, 05:29 PM   #1
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12.5 tires on 12.5 wheels

That's what was (and is) on my TJ when I bought it. Should I be worried about this combination and downsize my wheels?

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Old 02-28-2013, 06:18 PM   #2
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I suppose it depends on what you plan on doing with it ... Street should be fine as most cars will have rims and tires of equal width ... Off road you are not going to get very much sidewall flex with that set up and it is going to be very easy to unseat the bead if you air down at all ... I think a common rule of thumb is the wheel should be 2 inches narrower than the tires ... So you'd be better off with a 10 inch wheel ... That's the happy medium ... I have 12.5s on an 8 inch wheel by comparison which makes it a little bouncy on the road but allows for more flex on the rocks

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Old 02-28-2013, 09:24 PM   #3
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That makes sense. It is my DD but I do want to take it off road too. The current tires are radials so I doubt airing down would benefit me anyways.

I guess my biggest worry is how far the wheel itself sticks out seeing that the offset is so much larger than the backspace. Could it cause the ball joints and othe parts suffer excessive wear or premature failure?
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Old 02-28-2013, 11:05 PM   #4
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those look like eagle alloy series 058 15x12s ... I looked it up and the offset is -71 ... that's pretty massive ... by comparison the 15x10s have a -46 ... so yeah that is added stress on your ball joints and could cause them to wear out faster... personally I would considered getting new wheels

radials can be aired down just fine ... my old ATs I used to air down to 15psi ... now I can go down to 8-10psi with my MTZs ... they are making radials pretty tough now ... plus your BFGs are one of the few ATs that have a 3 ply sidewall ... so they hold up pretty well
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Old 03-01-2013, 09:25 AM   #5
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15x10 @ -46mm offset or 15x12 @ -71mm offset have about the same backspace, 3.75".

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Old 03-05-2013, 09:46 PM   #6
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Thaynks for that info. The main worry is the added offset since it mocws the tiee contact patch out and in theory oversteeas the joints. Is it really inoperative I change those rims or should I lice with those and buy a wheel/tire package down the road?
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Old 03-11-2013, 05:36 PM   #7
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So I found a set of 15x8 aluminum rims locally. Would it be a good idea to make the switch?
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Old 03-11-2013, 06:55 PM   #8
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IMO, any wheel with the same backspace is going to put the same amount of stress on your ball joints, regardless of the wheel width. Willing to bet the 15x8's have -19mm offset (which happens to be 3.75" backspace).

edit: ignore this. I just checked it and the wider wheel will put that tire out some more. So you might be better off with a 15x8. Maybe ask in the TJ forum for some input?

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Old 03-11-2013, 08:52 PM   #9
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Quote:
Originally Posted by elclipo View Post
So I found a set of 15x8 aluminum rims locally. Would it be a good idea to make the switch?
If the price it good and you would be happy with them ... I would. I am very happy with the 15x8 and 33" tire combo. You will get a little sidewall bulge, but nothing too bad. I'm putting on a pic of mine so you can see the bulge.

For reference these wheels have 3.75" backspacing, and you can see that they do stick out a ways which might cause problems with the law if you are sticking out from your fenders too far. But with a 12.5" wide tire you are going to need some backspacing to avoid rubbing at full lock, a lot of people will run spacers just for this and that adds on a whole new set of potential problems. On a JK I think that magic backspacing for that wide of a tire is at most 4.5". DB, has a point: Might wanna ask in the TJ forum to see what backspacing you'll need for that wide of a tire on a TJ. My guess is that those aluminum wheels you found have around a 4" backspacing if they are aftermarket. The higher the backspacing the closer they sit to the hubs and the less strain is put on the ball joints, but you also might run into some rubbing when you flex or turn.
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Old 03-11-2013, 09:04 PM   #10
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Quote:
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If the price it good and you would be happy with them ... I would. I am very happy with the 15x8 and 33" tire combo. For reference these wheels have 3.75" backspacing.

You will get a little sidewall bulge, but nothing too bad. Here is a pic of mine:
If by bulge you mean the tire sticks out further than the wheel, I'm perfectly ok with that. I actually prefer it to be honest. The current wheels stick out further than the tire thread. There are scratches on the rims where the PO hit the wheels because they are so wide.
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Old 03-11-2013, 09:14 PM   #11
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Yep... that is exactly what I mean by bulge. I prefer this setup for several reasons: The tire protects the rim better (Poor man's rim guard). The tire bead has more tension on it and therefore stays in place better (Poor man's bead locks). And it looks better, IMO. I think my JK looks more like a "Jeep" with the 15x8 wheels ... call me crazy.

Also, I like the option of being able to go down to a 10.5" width tire without having to change the wheels.
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Old 03-11-2013, 09:28 PM   #12
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Very good pints indeed. I didn't even think of the possibility or going down to a 10.5 tire in the future either.
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Old 03-11-2013, 09:44 PM   #13
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These are thew wheels. 15x8 5on4.5 pattern 3.75backspacing

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Old 03-11-2013, 09:51 PM   #14
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Those are pretty badass! Even at 3.75" bs you would still be bringing your tires an inch or two closer into your body, wouldn't stick out as far. Do you have something for the spare already?
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Old 03-11-2013, 09:58 PM   #15
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I have the stock pare with a stock tire. Never been off the carrier. I would love to find a 5 wheel set honestly but this is the beast deal I've seen so far.

Edit: and I'm sure it'll be easier to find a 5th wheel for this set thank my 12.5 set.
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Old 03-21-2013, 09:30 PM   #16
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Did you end up getting those wheels?

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