Way too confused on backspacing!

[Jeep&dogs]

I literally just spent the last 6 hours reading through backspacing threads and I feel as if I lost a few brain cells in the process. I just bought a 2020 Rubicon and I plan on running 315/70/17 KO2’s on it. I will most likely never do a lift but if I do it will be something mild. I want to keep the rim in the fenders as close to stock as possible. I was looking at the Icon Rebound but that I believe will put the wheel well out of the flares? Can anyone recommend what backspacing I should be trying to look for?

I had an Lj prior to this and I don’t recall it being nearly as much as a pain looking for wheels for it.

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[LLANERO]

If you want to keep the wheels in the fender as close to stock a possible, I suggest keeping the stock ones. Tires will stick out 0.59" more than stock.
I don't know if you will have ribbing issues.
I guess someone with a similar set up will chime in soon.

 

[Sting_NC_USA]

Have you seen this calculator?

If you want to keep the wheels in the fender as close to stock a possible, I suggest keeping the stock ones. Tires will stick out 0.59" more than stock.
I don't know if you will have ribbing issues.
I guess someone with a similar set up will chime in soon.

Have you seen this calculator: https://tiresize.com/wheel-offset-calculator/

The measurements for the wheel you described are 315/70/17 and a quick internet search indicates the offset on those wheels is -6 for a total backspacing of -4.5, which is normal for a non-lifted Jeep. If you find and plug in your current tire size and wheel offset, you'll get an image comparison of what is happening.

Good Luck!

PS: This is a great thread on the topic: https://www.jlwranglerforums.com/fo...and-backspace-of-stock-jl-rubicon-wheel.3992/

 

[Jeep&dogs]

Have you seen this calculator?



Have you seen this calculator: https://tiresize.com/wheel-offset-calculator/

The measurements for the wheel you described are 315/70/17 and a quick internet search indicates the offset on those wheels is -6 for a total backspacing of -4.5, which is normal for a non-lifted Jeep. If you find and plug in your current tire size and wheel offset, you'll get an image comparison of what is happening.

Good Luck!

PS: This is a great thread on the topic: https://www.jlwranglerforums.com/fo...and-backspace-of-stock-jl-rubicon-wheel.3992/

Yes, that was one of the many I read through today, the -6 just seems like it will push the tire way out.

 

[sourdough]

here is the tire stick out with a 12.5 width Cooper Pro, AEV JL Pintler 8.5 wide wheel. If I remember correctly this wheel is 5.77 BS +25 offset. Calculator below says this combo sticks out 1.5" more than stock.

 

[Jeep&dogs]

here is the tire stick out with a 12.5 width Cooper Pro, AEV JL Pintler 8.5 wide wheel. If I remember correctly this wheel is 5.77 BS +25 offset.

https://tiresize.com/wheel-offset-calculator/

That’s about the exact fit I am looking for!

 

[blnewt]

here is the tire stick out with a 12.5 width Cooper Pro, AEV JL Pintler 8.5 wide wheel. If I remember correctly this wheel is 5.77 BS +25 offset. Calculator below says this combo sticks out 1.5" more than stock.

I believe the stock JL wheel has a +44.5 offset. Calculator below should give you an idea as to how the wheel/tire combo you choose will change.
https://tiresize.com/wheel-offset-calculator/

Should be a good plan w/ stock suspension, as you go up in lift you have to go less positive on the offset. That 8.5 +25 is a nice fit on the Stock Rubicon running 315/70s, might have to go to offsets in the +10 range if you go up 1.5" lift, and a zero offset if you go to a 2.5".

 

[Jeep&dogs]

Should be a good plan w/ stock suspension, as you go up in lift you have to go less positive on the offset. That 8.5 +25 is a nice fit on the Stock Rubicon running 315/70s, might have to go to offsets in the +10 range if you go up 1.5" lift, and a zero offset if you go to a 2.5".

Coming from a Lj I am new on some of this. I am assuming the less positive offset is due to lower control are clearances on the lift? I will most likely not lift it but I will probably be going with aftermarket arms to gain some more caster.

 

[Jerrybizzle]

17x9 +12 offset with 12.5 wide tires
Don’t mind the messy garage.

 

[sourdough]

Coming from a Lj I am new on some of this. I am assuming the less positive offset is due to lower control are clearances on the lift? I will most likely not lift it but I will probably be going with aftermarket arms to gain some more caster.

AEV spec’d their JL wheels with +25 offset. Give them a call and ask one of their wheel techs about fitment.

+25 works on my JLR with a Mopar lift and 37’s. AEV can tell you about your tire choice.

 

[Discount Tire]

Backspace and offset can definitely be confusing. For example, a 20x9 with 4.5-inch BS fits different than a 20x10 with 4.5-inch BS. The inside clearance (towards suspension) between the two sizes are the same but the 20x10 will sit further out, specifically by 1-inch.

If you're looking to keep the tire/wheel assembly within the fenders as much as possible, a narrower width wheel with higher offset is the way to go.

On a side note for those not familiar how to convert wheel offset into backspace, check out the basic write-up below:

Offset & Backspace - How do they Relate | JLWranglerForums

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