Need help with offset/Backspacing - JeepForum.com

 
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post #1 of 12 Old 08-11-2013, 11:14 PM Thread Starter
irishluck
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Need help with offset/Backspacing

Im looking for some wheels and having issues with this whole backspacing and offset thing.

Ive done alot of reading online and found a few post on here but still am confused.
What is the difference between the two?

Right now My 33's on stock wheels are barely rubbing on my 2013 wrangler 2dr.
The rear is fine but when I tried to put on extended sway bar links they rub the tire.


So as far as I know, offset moves the center mounting part of the wheel either farther out of the rim or closer in so it moves the wheel kind of out more. Correct me if Im wrong?

So what is back spacing then?

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post #2 of 12 Old 08-12-2013, 08:27 AM
Astennis1
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Same thing different ways to measure.

Offset if the distance from center point of wheel which doesn't change with wheel width. Backspacing measures from the rear face of the wheel to the center mount (see conversion below based on wheel width)





EDIT: The less backspacing you have the further your wheels stick out from the vehicle

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post #3 of 12 Old 08-12-2013, 08:29 AM
TOK
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I went through some of this when I was looking for wheels. Not sure if I'm describing it 100% right, but here was my take on it...

Offset is a more generic number. Like you said, it defines the distance of the wheel body from the centerline of the wheel. How it differs from backspacing is that you can have completely different sized wheels with the same offset, but they would not necessarily both fit your Jeep because their backspacing is different for different widths/sizes.

The backspacing is the number that matters; it is the physical measurement of the the specific wheel you're looking at. The backspacing may vary across different sizes of the same wheel, while the offset doesn't change.
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post #4 of 12 Old 08-12-2013, 09:03 AM
scbroder
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Both numbers are important to consider. Lets say you are comparing a wheels and one is 8.5" wide, one is 9.5" wide. If the backspacing is the same then the clearance to the frame will be the same. However the 9.5" wheel will stick out from under the fender and additional 1 inch, which may or may not be desirable depending on your desires.
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post #5 of 12 Old 08-12-2013, 09:20 AM
brianjw
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Quote:
Originally Posted by scbroder
Both numbers are important to consider. Lets say you are comparing a wheels and one is 8.5" wide, one is 9.5" wide. If the backspacing is the same then the clearance to the frame will be the same. However the 9.5" wheel will stick out from under the fender and additional 1 inch, which may or may not be desirable depending on your desires.
Well you're partially right. The tire on the 9.5" wheel with equal back spacing will be centered 1/2" further OUT than the one on an 8.5" wheel.
So spacing between the wheel and frame would be the same, but the tire would be shaped differently and moved out from the frame to some extent as well.
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post #6 of 12 Old 08-12-2013, 11:44 AM Thread Starter
irishluck
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Ah okay, I kinda understand this now.

So here is my question then.

About what do I need for an aftermarket wheel for my jeep?

Again I have a 2013 wrangler sport 2 door.
I dotn mind the wheels sticking out of the fender a little bit, I actually prefer it.

I have 33"s on now and they rub slightly and the rear sway bar extended link rubs the tire when installed.

So can you guys help me out on what backspacing/offset I need?
Also what is the stock wheel offset/ backspacing?
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post #7 of 12 Old 08-12-2013, 12:12 PM
TOK
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The commonly accepted safe number is 4.5" or less to run up to 35" tires. Stock is 6.25" I believe.

You have a little bit of leeway there. I'm running Procomp 7036's (they say 4.75") with 315/70/17's and 2.5" lift and nothing is close to rubbing.
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post #8 of 12 Old 08-12-2013, 02:03 PM Thread Starter
irishluck
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Quote:
Originally Posted by TOK View Post
The commonly accepted safe number is 4.5" or less to run up to 35" tires. Stock is 6.25" I believe.

You have a little bit of leeway there. I'm running Procomp 7036's (they say 4.75") with 315/70/17's and 2.5" lift and nothing is close to rubbing.
Very nice looking jeep!
I do have a 2.5" lift already too.

So a 4.5" back spacing or less. Ill look around!
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post #9 of 12 Old 08-12-2013, 02:37 PM Thread Starter
irishluck
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http://www.streetsideauto.com/p/crag...FSVgMgod_BcA8Q

Heres a simple one Ive been looking at that claims to be 4.25 back spacing
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post #10 of 12 Old 08-12-2013, 03:12 PM
TOK
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Not sure from their description if that is the Cragar Soft 8, but that is the steel wheel a lot of guys run on JK's. If you google that name, you'll get a ton of links.

Good luck!
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post #11 of 12 Old 08-12-2013, 03:16 PM Thread Starter
irishluck
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Quote:
Originally Posted by TOK View Post
Not sure from their description if that is the Cragar Soft 8, but that is the steel wheel a lot of guys run on JK's. If you google that name, you'll get a ton of links.

Good luck!
For the price you cant beat it!
I do like the wheel.

Going to look around for a few other options just to see what else there is!
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post #12 of 12 Old 08-13-2013, 07:07 PM Thread Starter
irishluck
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I know this may not be the best way to ask this but does anyone know where to get a decent but cheap tire?

Hopefully some 33's. I know tires aren't cheap. About the lowest one is $200 that I've found.

Any help?
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