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post #1 of 11 Old 12-12-2015, 10:47 AM Thread Starter
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trailready backspacing

New to site and wanting opinions on trailready beadlock backspacing. I have 2015 jkur with 3.5 inch metalcloak gamechanger with their overland fenders. Wanting to run 37 12.50 tires. Trying to decide on 4, or 4.5 inch backspacing. I think I would like the looks of the 4.5 better, but don't want to have too much rubbing issues. Any thoughts and pictures of what anyone else is running would be appreciated. I know I could adjust the steering stops, but the unlimited turning radius is already compromised compared to my last TJ.
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post #2 of 11 Old 12-14-2015, 11:26 AM
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I rubbed and full lock and stuff with my 37's on a 4.5" BS wheel. I run a 1.5" spacer for an effective 3" BS and it's perfect.

You will want at least the 4" BS or less.

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post #3 of 11 Old 12-14-2015, 12:00 PM
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Go with 3.5" back spacing or you're going to rub on the frame under articulation and lower control arms when you turn. You might kiss the frame under hard articulation with a wheel turned with 3.5" back spacing, but you won't rub the lower control arms.

Let me know if you need any help!


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post #4 of 11 Old 12-14-2015, 01:10 PM
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Same ^ 4.5 bs rubbed and increased my turning radius. 3.5 bs did not rub, turning radius is lower but still not really tight.
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post #5 of 11 Old 12-22-2015, 08:31 AM
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Instead of starting a new thread, I thought I would also ask my question here. I am running a 2.5 RK flex lift on my 08 JKU Rubicon and am planning on buying Moto Metal 961's and 35x12.50R18 Mud Grapplers. I really don't know if I should get the 18x9s or 18x10s. Also, what backspacing should I get? Thanks in advance!
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post #6 of 11 Old 12-22-2015, 09:23 AM
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Quote:
Originally Posted by riklite View Post
Instead of starting a new thread, I thought I would also ask my question here. I am running a 2.5 RK flex lift on my 08 JKU Rubicon and am planning on buying Moto Metal 961's and 35x12.50R18 Mud Grapplers. I really don't know if I should get the 18x9s or 18x10s. Also, what backspacing should I get? Thanks in advance!
4 - 4.5" back spacing. -6 to -12MM offset equates to the same thing.


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post #7 of 11 Old 12-22-2015, 09:39 AM
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Quote:
Originally Posted by RiverCityOffroad View Post
4 - 4.5" back spacing. -6 to -12MM offset equates to the same thing.
Sort of.... Offset is wheel width dependent. It's the distance from the CL of the wheel.

Backspace is the distance from the inboard wheel face to the hub mount surface. It will always be consistent and independent of wheel width.

I can't say for certain with the wheel he highlighted but I've seen a bit of confusion in the past comparing offset to BS.

-Mike
2007 2dr X, 6sp, 35's on D44's, 2" lift, cage, hydro, etc.
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post #8 of 11 Old 12-22-2015, 09:52 AM
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Quote:
Originally Posted by JKred07 View Post
Sort of.... Offset is wheel width dependent. It's the distance from the CL of the wheel.

Backspace is the distance from the inboard wheel face to the hub mount surface. It will always be consistent and independent of wheel width.

I can't say for certain with the wheel he highlighted but I've seen a bit of confusion in the past comparing offset to BS.
It is the same thing with a different measurement. It literally refers to the same thing.

I was just trying to make it easy for the feller because Wheel Pros uses offset measurements on their website instead of back spacing.

6MM = .25"
12 MM = .5"

-6 on an 8" wide wheel is 4.0 back spacing
-6 offset on an 8.5" wide wheel is 4.25" back spacing
-12 on a 9" wide wheel is 4.5 back spacing

To obtain the measurement use this:

Width of Wheel + 1 = / 2 - OFFSET

9" Wheel with -12MM Offset

9 + 1 = 10 / 2 = 5 - 12MM (.5") = 4.5"


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post #9 of 11 Old 12-22-2015, 12:10 PM
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Thanks! I appreciate the info!
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post #10 of 11 Old 12-22-2015, 01:06 PM
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Quote:
Originally Posted by RiverCityOffroad View Post
It is the same thing with a different measurement. It literally refers to the same thing.

I was just trying to make it easy for the feller because Wheel Pros uses offset measurements on their website instead of back spacing.

6MM = .25"
12 MM = .5"

-6 on an 8" wide wheel is 4.0 back spacing
-6 offset on an 8.5" wide wheel is 4.25" back spacing
-12 on a 9" wide wheel is 4.5 back spacing

To obtain the measurement use this:

Width of Wheel + 1 = / 2 - OFFSET

9" Wheel with -12MM Offset

9 + 1 = 10 / 2 = 5 - 12MM (.5") = 4.5"
Agreed. I took your original comment to suggest that 6mm offset is always a fixed backspace. I was just clarifying it is dependent on wheel width.

Honestly though, I always understood offset as 0mm = 1/2(Width). I'm curious why the extra inch is considered in the calculation?

-Mike
2007 2dr X, 6sp, 35's on D44's, 2" lift, cage, hydro, etc.
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post #11 of 11 Old 12-22-2015, 01:11 PM
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Quote:
Originally Posted by JKred07 View Post
Agreed. I took your original comment to suggest that 6mm offset is always a fixed backspace. I was just clarifying it is dependent on wheel width.

Honestly though, I always understood offset as 0mm = 1/2(Width). I'm curious why the extra inch is considered in the calculation?
Blew my mind the first time I came across it too, but then you consider that the actual wheel is about 1/2" wider on both sides than the actual mounting surface of the tire and...


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