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Plus(+) 12mm or Minus(-) 12mm Offset for No-Rub

Binfordtools

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Finally getting around to buying wheels for my 2021 Willys. Running a 2" spacer lift and 35x12 Grapplers. I currently have stock wheels and 1.75" wheel spacers and the wheels stick out quite a bit. But without the spacers, I rub the lower control arm at full lock.
I want to get the RockTrix RT105 17x9 wheels which I can get either a plus 12mm offset or a minus 12mm offset. I don't like the look of the wheels sticking out past the fenders too much so I was considering the Plus (+) 12mm offset which is 5.5" of backspacing. Does anyone know if these will rub the LCA with my setup? It would give me an extra inch of clearance but is that enough with 35x12 tires to clear at full lock?

B29C0588-11BA-4F62-8284-7E7A3352C150_1_201_a.jpeg


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aldo98229

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Jeep OE wheels have 6.2 inches of backspacing. Rights now your 1.75-inch (44 mm) spacers are giving you 4.45 inches of backspacing. That is a LOT. That’s why your wheels look pushed so far out.

The wheels you are looking at with 5.5 b.s. means the wheels will only be 0.7 inches further out than OE. I don’t think that will be enough to clear, though.

Most AEV and Quadratec wheels have 5.2 inches of b.s. That’s the equivalent of having a 1-inch (or 25 mm) spacer. That seems to be the sweet spot between clearing and not pushing the wheels too far out.

For reference: 1 inch = 25 mm.
 
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Binfordtools

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Jeep OE wheels have 6.2 inches of backspacing. Rights now your 1.75-inch (44 mm) spacers are giving you 4.45 inches of backspacing. That is a LOT. That’s why your wheels look pushed so far out.

The wheels you are looking at with 5.5 b.s. means the wheels will only be 0.7 inches further out than OE. I don’t think that will be enough to clear, though.

Most AEV and Quadratec wheels have 5.2 inches of b.s. That’s the equivalent of having a 1-inch (or 25 mm) spacer. That seems to be the sweet spot between clearing and not pushing the wheels too far out.

For reference: 1 inch = 25 mm.
Thank you for the information. I'll take a look at some other wheels then. Appreciate it.
 
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Binfordtools

Binfordtools

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One other thing that I just remembered, I run the stock wheels which are 7.5" wide. With this, the 315/70-17 tires bulge quite a bit. The wheels I was looking at are 9" wide wheels which I assume will not make the wheels budge as much. I wonder if that combined with the 0.7" of added clearance would be enough to not rub the LCA?
 

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I am not a wheel expert but some of the info from previous poster is incorrect

AEV wheels spec'd for gladiators have backspacing around 5.75" and offset of +25.

so the inside edge of rim on the RT105 with 5.5" backspacing would have almost 1/4" more inside clearance than AEV with 5.75" backspacing. Now the RT105 are 17x9 and AEV are 17x8.5 so 1/2" wider. So the outer part of the wheel would stick out about 3/4" further than AEV.

If the stock wheels are 6.2" backspacing (going by previous poster since I don't have that info) and you have 1.75" spacers you are basically making your stock wheels 4.45" backspacing. So the RT105 would reduce your inside clearance by about 1" from stock wheels with spacers, but would gain .7" from stock with no spacers.

I have been comparing the saverge II to the RT105 as those are the wheels I have been considering. the RT105 with 5.5 BS and +12 offset should work fine, the 4.5 BS and -12 offset would also work but would be very close to inside clearance with your spacers but with a much wider wheel so would stick out even further than what you have with spacers.

As far as rubbing, I don't know as I am still running stock and havent pulled the trigger yet. But I was under the assumption AEV wheels cleared stock control arms running 35" tires, so the RT105 5.5bs +12 offset should also clear.
 

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Binfordtools

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stick out even further than what you have with spacers.

As far as rubbing, I don't know as I am still running stock and havent pulled the trigger yet. But I was under the assumption AEV wheels cleared stock control arms running 35" tires, so the RT105 5.5bs +12 offset should also clear.
I am actually trading emails with Rocktrix right now about this. I will post what they come up with.
 

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FYI Most aftermarket companies want 4.5-4.75” of backspace to clear their control arms if you add a real lift, not sure if you’ve thought about going that far or sticking to spacers.

AEV gets away with less, 5.2” or whatever, since they just use stock control arms, which apparently have an inward curve to give wheels more clearance.

I’m surprised you rub stock as I thought people weren’t having that issue with 35s?
 
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Binfordtools

Binfordtools

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I heard back from RockTrix. They had asked what the factory Willy's wheel offset was. I thought it was 44mm so I gave them that. With their wider wheel (9" vs. 7.7") and the +12mm offset, it looks like I'd gain about 1/2" on the inner. That combined with less tire bulge (in theory) should be close to not rubbing on the LCA.


Jeep Gladiator Plus(+) 12mm or Minus(-) 12mm Offset for No-Rub 1624908006051
 

DankjeeP

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I heard back from RockTrix. They had asked what the factory Willy's wheel offset was. I thought it was 44mm so I gave them that. With their wider wheel (9" vs. 7.7") and the +12mm offset, it looks like I'd gain about 1/2" on the inner. That combined with less tire bulge (in theory) should be close to not rubbing on the LCA.


Jeep Gladiator Plus(+) 12mm or Minus(-) 12mm Offset for No-Rub 1624908006051
Good site here you can play around with the numbers
https://tiresize.com/wheel-offset-calculator/
 
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Binfordtools

Binfordtools

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@Binfordtools What did you end up going with? I am in the same boat as you, trying to figure out if I should go with 5.5 or 4.5 backspacing.
 

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@Binfordtools What did you end up going with? I am in the same boat as you, trying to figure out if I should go with 5.5 or 4.5 backspacing.
Here's my truck with RT 109s, 17x9, +12mm offset, 5.5 inch backspace. They only stick out a bit beyond the fenders, lots of space on the inside, currently running OEM tires but I'm pretty confident that 315/70/17 would be fine since that's only needing 15mm additional clearance on the inside, the extra wheel width needs another 19mm, total of 34mm clearance needed. Change of offset from 44 to 12 netted me 32mm, so in all I think it's pretty much identical to factory clearance using these wheels and 35 inch tires.
The -12mm offset wheels look very wide and stick out a lot with stock bodywork.

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TheScott

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That looks really good! I will be running BFG KO2 315/70/17 so that info was much appreciated!
 

md_adirondacks

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I'm running 315/70-17 (BFG KO2) tires on 9in wide wheels with +18 offset and this is what it looks like, +12 will stick out just a little more.
IMO its perfect but everyone has their own taste.

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DustyGladiator

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I'm running 315/70-17 (BFG KO2) tires on 9in wide wheels with +18 offset and this is what it looks like, +12 will stick out just a little more.
IMO its perfect but everyone has their own taste.

Jeep Gladiator Plus(+) 12mm or Minus(-) 12mm Offset for No-Rub IMG_3287


Jeep Gladiator Plus(+) 12mm or Minus(-) 12mm Offset for No-Rub IMG_3287
Do you have any more info on your wheel choice? Backspacing, etc? Your wheel poke is just about exactly what I am looking for. All of the others I have seen to date stick out way to much for my liking.
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