Default another stupid QUESTION 

Old 04-06-2010, 06:08 PM   #1
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What the heck is back spacing in regard to rim selection and what effect does It have ??? What do I need to know about this when I am choosing a new rim?...

 

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Default Re: another stupid QUESTION 

Old 04-06-2010, 06:26 PM   #2
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Before going into a long and complicated post trying to get as much info as possible into a confined space
let me just direct you here

https://www.rsracing.com/tech-wheel.html

ps, no question is stupid, not asking a question is stupid,
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Default Re: another stupid QUESTION 

Old 04-06-2010, 07:38 PM   #3
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Here ya go:



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Default Re: another stupid QUESTION 

Old 04-06-2010, 07:42 PM   #4
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Basically back spacing is the distance from the edge to the mounting surface.
The more negative back spacing the more the wheel will stick out away from the vehicle, however this also puts stress on the axle.

Ideal is to have no negative or positive, the wheel mounting surface will be centered
and you'll have less strain on the axle.
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Default Re: another stupid QUESTION 

Old 04-06-2010, 09:41 PM   #5
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Quote:
Originally Posted by BrockGrimes View Post
Basically back spacing is the distance from the edge to the mounting surface.
The more negative back spacing the more the wheel will stick out away from the vehicle, however this also puts stress on the axle.

Ideal is to have no negative or positive, the wheel mounting surface will be centered
and you'll have less strain on the axle.
SO? Is there a preferred back spacing for a rim on a 81 cj-7 narrow trac going to a 33x1250x15 tire ? example 3.75 BS on a 5 on 5.5 15x8

 

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Default Re: another stupid QUESTION 

Old 04-06-2010, 09:44 PM   #6
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Do you have options?

Quote:
Originally Posted by SANDBLASTER View Post
SO? Is there a preferred back spacing for a rim on a 81 cj-7 narrow trac going to a 33x1250x15 tire ? example 3.75 BS on a 5 on 5.5 15x8
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Default Re: another stupid QUESTION 

Old 04-06-2010, 09:53 PM   #7
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Do you have options?
Not sure what you mean.

 

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Default Re: another stupid QUESTION 

Old 04-06-2010, 09:57 PM   #8
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A 4" backspace is as close as you can get to your calipers assuming disc brakes. Up to 31" tires and you will be good on lock to lock clearance with your leaf springs. Going bigger on the tires will mean you need less backspace to move the tire out farther for clearance.
If you are going with 33x12.5 you will want less backspace than 4" say 2-1/2" but trying to find the wheels you want with those numbers tough, you may have to then think about wheel spacers to gain tire clearance.
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Default Re: another stupid QUESTION 

Old 04-06-2010, 10:03 PM   #9
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how many different back space dimentions do wheel manufacturers give you on an 8" wide wheel? If stock is 4" I would say you will not be able to have more with out dragging the tire and depending what width the new tire is, say 2" wider than stock, you may want less back space, 3" perhaps. this way all the additional rubber moves away from the wheel well to keep the inside edge close to the original position, relitive to the wheel well.
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Default Re: another stupid QUESTION 

Old 04-06-2010, 10:13 PM   #10
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Quote:
Originally Posted by IOPort51 View Post
how many different back space dimentions do wheel manufacturers give you on an 8" wide wheel? If stock is 4" I would say you will not be able to have more with out dragging the tire and depending what width the new tire is, say 2" wider than stock, you may want less back space, 3" perhaps. this way all the additional rubber moves away from the wheel well to keep the inside edge close to the original position, relitive to the wheel well.
OK! so I'm not the sharpest knife in the drawer BUT ...
will the 3.75 inch BS work with the 33X1250X15 tire on my 1981 CJ-7

 

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