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Correct backspacing and bolt pattern?

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Old Feb 27, 2011 | 05:40 PM
  #1  
LoganKello's Avatar
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From: The sticks, Iowa
Car: Trans Am GTA
Engine: 305 TPI
Transmission: 700r4
Correct backspacing and bolt pattern?

Hi guys, Im gonna buy some of the following:

Cragar Superspoke 15x7 in front with BFG T/A 225/60/15
Cragar Superspoke 15x8 in back with BFG T/A 275/60/15

When it comes to wheels and backspacing I know nothing so I was wondering what bolt pattern and what backspacing to order

Thanks guys!!!
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Old Feb 27, 2011 | 05:59 PM
  #2  
//<86TA>\\'s Avatar
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From: Central NJ
Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: Correct backspacing and bolt pattern?

bolt pattern, 5x4.75, backspacing, rear can be 4.5" to 5", front should be 4-4.5".

the factory 15x7's use a zero offset, or 4" of backspacing, and the factory 16x8's use a little over 5 in the rear and 4.5 in the front.

so to keep the wheels in the same place as your stock ones, you would want 4" in the front and 5 in the rear, but 4.5 in the rear will work just as well and bring the tire out a little more.
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Old Feb 27, 2011 | 06:18 PM
  #3  
LoganKello's Avatar
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From: The sticks, Iowa
Car: Trans Am GTA
Engine: 305 TPI
Transmission: 700r4
Re: Correct backspacing and bolt pattern?

Awesome Thank you!!!
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Old Oct 29, 2012 | 09:11 AM
  #4  
quick90rs's Avatar
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Car: 1990 Camaro RS
Engine: 350 Vortec Demon 650CFM
Transmission: 700R4
Axle/Gears: Posi
Re: Correct backspacing and bolt pattern?

Is it possible to run the same backspacing for all 4 wheels? would it be 4.5". and whats the backspace?
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Old Oct 29, 2012 | 03:36 PM
  #5  
//<86TA>\\'s Avatar
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Joined: Aug 2006
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From: Central NJ
Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: Correct backspacing and bolt pattern?

Originally Posted by quick90rs
Is it possible to run the same backspacing for all 4 wheels? would it be 4.5". and whats the backspace?
Depends what width wheeels. An 8" will will fit with 4.5" of bs front and rear if that's what you are asking. Backspacing is the distance from the wheels mounting surface to the back most part of the wheel
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Old Oct 28, 2018 | 02:55 PM
  #6  
superccs's Avatar
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Re: Correct backspacing and bolt pattern?

Backspacing Explained...
https://www.wheelpros.com/page/offset-explained/9

I just learned something, so you can too :P
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