JL Offset & Backspacing Finally Answered!

Yovwmon

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And the answer is - it’s complicated. (Read on)

The offset & backspacing debate has many right answers due to variance in what folks like and what actually works. The endless combination of wheels, tires and suspension plays a major role in the confusion. With your help this thread will become the JL Wrangler Forums “Go-to” for the offset & backspacing answers we’ve all been asking.

Instructions: Please copy and paste the below template into your reply and fill in ALL the fields.
  • JL Model: (Specify Rubicon, Sport or Sahara)
  • Wheel: (Specify Make & Model)
  • Offset: (Specify millimeter number and +/0/-)
  • Backspacing: (Specify in inches)
  • Tire Make: (Specify Make & Model)
  • Tire Size: (Ex, 285/75 17)
  • Lift: (Specify number of inches)
  • Rubbing: (Specify where and when)
  • Pictures: (Add images that show wheels/tires from the front, side and rear)





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Last edited:
OP

Yovwmon

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  • Thread starter
  • Thread Starter
  • #2
  • JL Model: Sport Altitude
  • Wheel: Stock 18” Altitude wheel
  • Offset: +44.5
  • Backspacing: 6”
  • Tire Make: BF Goodrich KO2
  • Tire Size: 275/70R 18
  • Lift: 2.25” Rubicon takeoff w/.50 leveling kit
  • Rubbing: No rubbing anywhere
  • Pictures:

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Headbarcode

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1
  • JL Model: Rubicon
  • Wheel: 17x9 KMC XD138 Brutes
  • Offset: -12mm
  • Backspacing: 4.53"
  • Tire Make: Milestar Patagonias
  • Tire Size: 38x13.50
  • Lift: 3.5" Metalcloak Gamechanger 6-pack edition/Synergy hybrid
  • Rubbing: Rear pinch seam (not yet trimmed)
  • Jeep Porn:
    20200815_110338_resized.jpg
    20200813_083445_resized.jpg
    20200815_110458.jpg
    20200813_083706_resized.jpg
    20200813_083632_resized.jpg
 

blnewt

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Hard act to follow there Mike @Headbarcode :( But here goes~


  • JL Model: (Specify Rubicon, Sport or Sahara) Sport S 2dr
  • Wheel: (Specify Make & Model) American Racing ATX Ravine (hubcentric) 17x8.5
  • Offset: (Specify millimeter number and +/0/-) +10
  • Backspacing: (Specify in inches) 4.7
  • Tire Make: (Specify Make & Model) Milestar Patagonia
  • Tire Size: (Ex, 285/75 17) 295/70/17
  • Lift: (Specify number of inches) 2" Rubicon Suspension Swap from JLUR w/ Hardtop, Tow and Steel Bumper pkgs
  • Rubbing: (Specify where and when) Plastic Euro fender inserts at full lock, since removed.
Pics 1 thru 5 are without any lift, pic 6 is w/ Rubicon Suspension Swap, pic 7 &8 is w/ Stubby bumper & winch (190 lbs total added) for a 1/2" drop in front.

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ChattVol

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  • JL Model: Rubicon
  • Wheel: 17x9 KMC XD138 Brutes
  • Offset: -12mm
  • Backspacing: 4.53"
  • Tire Make: Milestar Patagonias
  • Tire Size: 38x13.50
  • Lift: 3.5" Metalcloak Gamechanger 6-pack edition/Synergy hybrid
  • Rubbing: Rear pinch seam (not yet trimmed)
  • Jeep Porn:
    20200815_110338_resized.jpg
    20200813_083445_resized.jpg
    20200815_110458.jpg
    20200813_083706_resized.jpg
    20200813_083632_resized.jpg
Looks great...How many bumpstops? Would love to hear feedback after you wheel it and flex it fully. I've read where others have had solid rubbing with fender chop on the front inner liner & frame/brackets wheelin hard with 38x13.50 tires on 17x9 with 4.5 backspacing wheels. I'm running 37x12.50 Pats with 17x8.5 wheels with a backspacing that measures 4.6 with 2" bumpstops and it rubbed hard on the frame/brackets under the fender at full droop with 29" of extended shock in front. The axle shifts quite a bit when one side droops alot and you stuff the other side...I was surprised. Your crazy long travel 6 pack shocks will shift the axle even further.

This where I had heavy rubbing up front.
IMG_20200802_192536_893.jpg

FgCC5D8.jpg
 
Last edited:

ocrejects

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Looks great...How many bumpstops? Would love to hear feedback after you wheel it and flex it fully. I've read where others have had solid rubbing with fender chop on the front inner liner & frame/brackets wheelin hard with 38x13.50 tires on 17x9 with 4.5 backspacing wheels. I'm running 37x12.50 Pats with 17x8.5 wheels with a backspacing that measures 4.6 with 2" bumpstops and it rubbed hard on the frame/brackets under the fender at full droop with 29" of extended shock in front. The axle shifts quite a bit when one side droops alot and you stuff the other side...I was surprised. Your crazy long travel 6 pack shocks will shift the axle even further.

This where I had heavy rubbing up front.
IMG_20200802_192536_893.jpg

FgCC5D8.jpg
  • JL Model: Rubicon
  • Wheel: 17x9 Fuel Beadlocks Covert
  • Offset: -15mn
  • Backspacing: 4.5
  • Looks great...How many bumpstops? Would love to hear feedback after you wheel it and flex it fully. I've read where others have had solid rubbing with fender chop on the front inner liner & frame/brackets wheelin hard with 38x13.50 tires on 17x9 with 4.5 backspacing wheels. I'm running 37x12.50 Pats with 17x8.5 wheels with a backspacing that measures 4.6 with 2" bumpstops and it rubbed hard on the frame/brackets under the fender at full droop with 29" of extended shock in front. The axle shifts quite a bit when one side droops alot and you stuff the other side...I was surprised. Your crazy long travel 6 pack shocks will shift the axle even further.

    This where I had heavy rubbing up front.
    IMG_20200802_192536_893.jpg

    FgCC5D8.jpg
JL Model: Rubicon 2018
  • Wheel: 17x9 Fuel Covert Beadlocks
  • Offset: -15mm
  • Backspacing: 4.5”
  • Tire Make: Milestar Patagonias
  • Tire Size: 37x12.50x17
  • Lift: 2.5” Rock Krawler
  • Rubbing: very little, Rear Back plastic finder liner. Took off. No issues anywhere else.

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blnewt

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JL Model: Rubicon 2018
  • Wheel: 17x9 Fuel Covert Beadlocks
  • Offset: -15mm
  • Backspacing: 4.5”
  • Tire Make: Milestar Patagonias
  • Tire Size: 37x12.50x17
  • Lift: 2.5” Rock Krawler
  • Rubbing: very little, Rear Back plastic finder liner. Took off. No issues anywhere else.

1D9DA663-C521-43B7-B9D0-E3796A18B3F3.png
Just dippin your toe in the shallow end I see :)
NICE!
 

ChattVol

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  • JL Model: Rubicon
  • Wheel: 17x9 Fuel Beadlocks Covert
  • Offset: -15mn
  • Backspacing: 4.5
JL Model: Rubicon 2018
  • Wheel: 17x9 Fuel Covert Beadlocks
  • Offset: -15mm
  • Backspacing: 4.5”
  • Tire Make: Milestar Patagonias
  • Tire Size: 37x12.50x17
  • Lift: 2.5” Rock Krawler
  • Rubbing: very little, Rear Back plastic finder liner. Took off. No issues anywhere else.

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BFD70E62-F526-421F-9842-40711CEEAC91.jpeg


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Nice! Any full flex pics? How many bumpstops? I had wheeled mine several times previously without any bad rubbing until I hit full flex.(one rear tire came off the ground) My shocks are also the RK 3.5" twin tube shocks that extend to 29"...that also contributed. I think 17x9 with 4.5 backspacing would be ideal with 37x12 50. With 38x13.50, I think it takes backspacing closer to 4.0 to clear at full flex. Mine also bottomed out here with rear tire 39" lifted:
WSBuDtu.jpg
IUoJ1Uo.jpg
 

sourdough

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  • JL Model: rubicon
  • Wheel: AEV JL Pintler
  • Offset: 5.77 +25
  • Tire Make: cooper stt pro
  • Tire Size: 37x12.5r17
  • Lift: mopar approx 2.75
  • Rubbing: eleminated rubbing at rear liners with heat reshaping and front LCA's with steering stops out 1/4"
  • Pictures:
  • JL w new shoes 2.jpg
    JL tire stick out.jpeg
    JLR flexed frt..jpeg
    JLR flexd rear.jpeg
 

ChattVol

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  • JL Model: rubicon
  • Wheel: AEV JL Pintler
  • Offset: 5.77 +25
  • Tire Make: cooper stt pro
  • Tire Size: 37x12.5r17
  • Lift: mopar approx 2.75
  • Rubbing: eleminated rubbing at rear liners with heat reshaping and front LCA's with steering stops out 1/4"
  • Pictures:
  • JL w new shoes 2.jpg
    JL tire stick out.jpeg
    JLR flexed frt..jpeg
    JLR flexd rear.jpeg
Nice...love those tires. 37s will clear with wheels with higher backspacing with the mopar lift bc it doesn't have alot of travel. I think front shocks only extend to 26". What did your jeep score in that flex test?
 
Last edited:
OP

Yovwmon

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  • Thread starter
  • Thread Starter
  • #12
  • JL Model: Sport Altitude
  • Wheel: 17” Fuel Nitro
  • Offset: -12
  • Backspacing: 4.25
  • Tire Make: Goodyear Duratrac
  • Tire Size: 315/70R 17
  • Lift: 2.25” Rubicon takeoff w/.50 leveling kit
  • Rubbing: No rubbing anywhere under normal road driving. Vehicle rides incredibly well, very stable and these D load tires feel so much better on bumps than what the BF Goodrich Ko2 E load did.

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Jerrybizzle

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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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ocrejects

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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:

1A84ADAF-E779-48DE-8017-1D965D26CB3B.jpeg


EE5DA43C-5D3C-4F2F-88BF-8FFE35F282BF.jpeg


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Who makes your back bumper?
 

Jerrybizzle

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Who makes your back bumper?
EAG from amazon but I think it’s discontinued. Wanted a full wrap around which was kind of hard to find. I have eag front and rear bumper along with the sliders. Been real happy with them for the price. About $800 for all 3.

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