What Backspacing?

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Dec 16, 2007 | 03:48 PM

everclear4520

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From: Texas

What Backspacing?

i'm going to put a 9" Rear in my car and its 2" shorter on each side... and i'm gonna get some new Boyds 17-10's what is the backspacin i should choose?
i lookin to go with a big lip rim.. which i think i have to do anyways with the Narrowed rearend

any help would help alot

Thanks Matt

Dec 17, 2007 | 06:13 PM

everclear4520

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anyone?

Dec 17, 2007 | 07:42 PM

ERIK@MASPORT

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bob from epp runs his m9 narrowed 2", maybe he can chime in

Dec 17, 2007 | 08:10 PM

382ssz28

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From: N Canto, Ohio

The factory backspacing is 6 3/4" on stock rims. If your 9" is 2" narrower on each side, your backspace should be 4 3/4". The old way was to use a plumb bob after centering your new diff at ride height. I'm going off of my 02 ss car with the 9.5" 10 spokes.

Dec 17, 2007 | 09:35 PM

everclear4520

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so when i go to order i should say i need two 17 by 10" wide with 4 3/4 backspacing?

and whats a plumb bob?

Dec 18, 2007 | 10:03 AM

ERIK@MASPORT

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Sorry Bob from EPP only narrowed his 1" per side, sorry about that!
E

Dec 18, 2007 | 10:06 AM

ERIK@MASPORT

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Using a plump bob helps determine the center of something by hanging a weighted item off of a string and seing where it hangs in relation ship to whatever it is you are trying to center, or measure from. I am sure that did not clear anything up, but if you saw one, you'd see right away what I was talking about...
For instace, you can use the plumb bob method to determine whether or not your rear is centered. It is not the best most accurate way, but it is a good start and can give you a good indication!