backspacing question - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 11 Old 09-07-2010, 07:31 PM Thread Starter
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backspacing question

ordered a set of 17inch wheels with a 4.75 backspacing. Im going to run 40s and was told it would not rub...Looking around on here it seems 4.5 is the highest with 35s. Anyone with experience with this? 17x9 4.75 backspacing wheels and 40x13.5x17 tires. Lift is is RK long arm and D60 axles.

Last edited by jvalason; 09-07-2010 at 08:05 PM.
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post #2 of 11 Old 09-07-2010, 07:53 PM
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backspacing has everything to do with the WIDTH of the tire and not the diameter.

I run 4.5 BS with my 37" 12.5" wide tires. No issues.

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post #3 of 11 Old 09-07-2010, 08:01 PM Thread Starter
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Ok so anyone know if 4.75 backspacing will work on a 13.5inch wide tire?

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post #4 of 11 Old 09-07-2010, 08:22 PM
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If youre running full width D60 axles you should be fine. If youre running stock JK axles you will rub.

To run a 38x14.5R16 tire on a 16x10 wheel I had to go to a 3.5" B/S, but that is with the stock axles.
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post #5 of 11 Old 09-07-2010, 09:50 PM
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Try using this wheel size calculator...

http://www.rimsntires.com/rt_specs.jsp


Plug in the numbers for your current rim and tire and compare them to your new rim and tire...
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post #6 of 11 Old 09-07-2010, 10:28 PM
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You will for sure rub at full turn on the lower control arms.

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post #7 of 11 Old 09-08-2010, 12:35 PM
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Quote:
Originally Posted by jvalason View Post
Ok so anyone know if 4.75 backspacing will work on a 13.5inch wide tire?
A 9" wide rim is fine for a 13.5" wide tire, as to the back spacing, I run 17x10.5 rims with 4" backspacing and 40x13.5's and they rub hard on the frame with stock width axles. Wider axles will help a lot, but I'd still try and keep the Back spacing below 4".
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post #8 of 11 Old 09-08-2010, 04:30 PM
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I run 37 13.5 on a 9" wheel & stock width axle and it rubs the lower arms at full lock.

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post #9 of 11 Old 09-09-2010, 10:39 AM
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Quote:
Originally Posted by Desert Rat Off-Road View Post
If it rubs, you can run 1 1/2" wheel spacers.
I had to run 1.5" spacers back when I had 37's and rims with 4.75" BS on stock axles, otherwise they rubbed a lot.
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post #10 of 11 Old 09-10-2010, 07:06 AM
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you said D60 axles...

if you have wider than stock axles..Then you might be fine..But you still might need a little back spacing. possibly 1/2".

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post #11 of 11 Old 09-10-2010, 11:21 AM
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There are some running 13.50 width on 4.5BS, most get rubbing issues. Some say a lot, some say not much.

I'm getting ready to mount a set myself on 4.5BS so we'll see.
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