JL Offset & Backspacing Finally Answered!

SSinGA

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  • JL Model: JLU Rubicon
  • Wheel: Raceline 928M Monster 17"
  • Offset: -12
  • Backspacing: 4.5
  • Tire Make: Cooper STT Pro
  • Tire Size: 37x13.5x17
  • Lift: Rock Krawler X-Factor 3.5"
  • Rubbing: Full turn on lower control arm (very slight)
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Stuckinthesand

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Toyo open country ATII
35x12.5x17
Rough country 2.5” spacer lift
No rubbing at all

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Tdkrum5

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20 Unlimited Altitude, still have stock wheels and1.5 inch spacers till wheels and tire arrive. Problem is not sure about the wheels yet. Tires will be 37.

JL Model: Sport Altitude
Wheel: Stock 18” Altitude wheel
Offset: +44.5
Backspacing: 6”
Tire Make: Goodyear Wrangler Ultra Terrain AT
Tire Size: 275/70R 18
Lift: Clayton off-road 2.5+ overland
Rubbing: Yes with the lift this is why the 1.5" spacers. Clayton says 4.75 backspacing for their lifts.
Pictures:

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Last edited:

PillowFightr

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I was hoping to see the KMC XD231 RG Race (0 offset) and KMC XD232 RG Race (-38 offset), but i cant find much info about them :(

Those are the only 2 wheels i like and i dont think ill be able to fit the -38 onto my rubicon diesel, i think it will rub! I might just go with the 0 offset version!

This thread is amazing, hopefully more people post their configs and pics here! 😎
 

Stuckinthesand

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I was hoping to see the KMC XD231 RG Race (0 offset) and KMC XD232 RG Race (-38 offset), but i cant find much info about them :(

Those are the only 2 wheels i like and i dont think ill be able to fit the -38 onto my rubicon diesel, i think it will rub! I might just go with the 0 offset version!

This thread is amazing, hopefully more people post their configs and pics here! 😎
Try this thread. It’s not diesel but still Rubicon’s.

https://www.jlwranglerforums.com/fo...dlocks-dirty-life-dts-etc.65763/#post-1392613
 

JL2021guy

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[*]JL Model: JLUR
[*]Wheel: gfx tr 10
[*]Offset: +12
[*]Backspacing: ~5.5
[*]Tire Make: mastercraft courser mxt
[*]Tire Size: 37 12.5 17
[*]Lift: mopar 2.5-3
[*]Rubbing: super mild on inner fenders when off roading. Not enough to be bothersome
[*]Pictures:

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i wasnt aware mopar has more than a 2" lift. do you mean that the 2" lift gives more than 2"? i will have to look into this more...
 

Tdkrum5

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JL Model: 20 JLU Altitude with Rubicon D44 axles
Wheel: Teraflex Nomad
Offset: 0
Backspacing: 4.75
Tire Make: Nitto Trail Grappler
Tire Size: 37 12.5 17
Lift: Clayton Off-road 2.5 plus overland lift. I got around 3"
Rubbing: None at this time with minor flexing . Sport fenders are a little narrower cause of smaller axles. Waiting on the Rubicon High line fenders before I really test it out. Also have the Terafles front sway quick disconnects.
Pictures: From the driveway

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InMyImage

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Legitimate questions, not trying to be rude or flippant... examples of what people are running is interesting but there aren’t any “answers” in this thread.

We are going to attempt to afford solid upgrades for a trip to the Rubicon Trail next summer and would like to actually make it through it.... We have a stock 2019 JLU Rubicon and are looking at 37” tires with beadlock rims and a 3.5 lift that requires a backspacing of 4.75 or less but doesn’t specify an offset so what would be good guidelines for the rim offset for common wheel widths?

Thanks
 

GATORB8

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Legitimate questions, not trying to be rude or flippant... examples of what people are running is interesting but there aren’t any “answers” in this thread.

We are going to attempt to afford solid upgrades for a trip to the Rubicon Trail next summer and would like to actually make it through it.... We have a stock 2019 JLU Rubicon and are looking at 37” tires with beadlock rims and a 3.5 lift that requires a backspacing of 4.75 or less but doesn’t specify an offset so what would be good guidelines for the rim offset for common wheel widths?

Thanks
Offset and backspace relationship changes with wheel width. Actual wheel width is 1” wider than nominal. Offset is the movement in the mounting face from the center line, so dead center is 0mm offset.

so… a 8.5” wheel is actually 9.5” wide, 0 offset would be a backspace of exactly half, so 4.75. So you need an offset of 0mm or less
A 9” wheel would be 10” wide, so 0 offset is 5” BS. You need at least 1/4” less which is about 6mm, so you would need an offset of -6mm or “less”
 

InMyImage

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Offset and backspace relationship changes with wheel width. Actual wheel width is 1” wider than nominal. Offset is the movement in the mounting face from the center line, so dead center is 0mm offset.

so… a 8.5” wheel is actually 9.5” wide, 0 offset would be a backspace of exactly half, so 4.75. So you need an offset of 0mm or less
A 9” wheel would be 10” wide, so 0 offset is 5” BS. You need at least 1/4” less which is about 6mm, so you would need an offset of -6mm or “less”
Thanks! That’s really helpful, appreciate it and enjoy your weekend.
 

JasonInDLH

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I wish I had found this thread when I was shopping for wheels and tires!


  • JL Model: Rubicon
  • Wheel: Ballistic Rage
  • Offset: -19mm
  • Backspacing: 4.75
  • Tire Make: BFGoodrich Mud Terrain KM3
  • Tire Size: 325/60R20
  • Lift: AEV DualSport 2.5”
  • Rubbing: None
  • Pictures:

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GATORB8

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Guess I may as well post our setup while I'm here.


  • JL Model: JLUR 4xe
  • Wheel: Raceline Clutch 17x8.5 (934B)
  • Offset: +18 mm
  • Backspacing: 5.46
  • Tire Make: BFG AT KO2
  • Tire Size: 35x12.50R17
  • Lift: 2" F, 1.5" R, 2" Bumpstops
  • Rubbing: Front: full lock full stuff minor on aftermarket front bumper
  • Pictures:

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2019 JLUR

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This thread really does not give anyone any good information without telling us how much bumpstop front and rear. Rubbing or not rubbing is usually because of the amount of bumpstop.
 
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