Offset or backspacing ? - Team Camaro Tech
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post #1 of 7 (permalink) Old Dec 8th, 10, 12:05 PM Thread Starter
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Offset or backspacing ?

I have a 68 Camaro and want to purchase two rims at these measurements (15 x 8 Wheels Chevy 4 3/4 3 1/2 BS ) . Does anyone know if these will fit my car ? I have 15x8 rims there now, but i'm concerned about the 3 1/2 back spacing ? What to do ? Here are some pictures of my Camaro rear.

https://www.camaros.net/forums/album.php?albumid=531


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68 Camaro / 400 ci / 3.73 10 /
Edelbrock Performer Series 600 cfm no. 14054
Edelbrock Performer EPS Intake Manifold 27014

98 GMC Suburban / 454 V8 / K2500 4x4

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post #2 of 7 (permalink) Old Dec 8th, 10, 02:08 PM
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Re: Offset or backspacing ?

3 1/2 will push the tire out away from the car. Get a 4 1/2" BS and it will be damn near centered (with a stock length rear).

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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post #3 of 7 (permalink) Old Dec 8th, 10, 02:11 PM
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Re: Offset or backspacing ?

Are we talking front or rear rims?
What is the current backspacing (BS) you have on your rims?
3 1/2 BS seems too little for a 8" rim. If you research on here you'll find that 4"-4.75" is the typical common BS for 8" rims and majority being 4.5".

Matt

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post #4 of 7 (permalink) Old Dec 8th, 10, 02:23 PM Thread Starter
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Re: Offset or backspacing ?

Doug G - Thanks for the head up buddy.

zlek131 - They would be for the rear. Unfortunately i'm not very smart so i don't know. But i do know i have 15x8 inch rims that i busted. Not sure about back spacing ?


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68 Camaro / 400 ci / 3.73 10 /
Edelbrock Performer Series 600 cfm no. 14054
Edelbrock Performer EPS Intake Manifold 27014

98 GMC Suburban / 454 V8 / K2500 4x4

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post #5 of 7 (permalink) Old Dec 8th, 10, 05:05 PM
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Re: Offset or backspacing ?

4.5" BS...275/60/15 MT DR's



68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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post #6 of 7 (permalink) Old Dec 8th, 10, 05:51 PM
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Re: Offset or backspacing ?

Just happen to have some good pictures for you:

67 Camaro with Hotchkiss rear springs, nothing in the car, bare body. It will lower down a bout 1 inch after everything is back in it.

My wheel is Crager Eliminator 15x8 4.5 inch back space and the other one is a 15x8 SS wheel with 4.5 inch back space.

The BFG 255/60/15 on the SS wheel:







The Crager eliminator 4.5 inch back space and 275/60/15 tire







The master craft tire is a junk tire for fit check only but this shot made me go 255/60/15. More side wall and more side wall bulge than I wanted on the 15x8 wheel. It looks like a truck tire on there....


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post #7 of 7 (permalink) Old Dec 8th, 10, 06:07 PM
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Re: Offset or backspacing ?

Since you mentioned "Offset & Back Spacing" Offset is the distance from the wheels mounting pad to the center of the wheel. Back Spacing is the distance from the pad to the inner rim lip. Check this link, it has a couple graphic's and a nice chart for figuring out what you want...

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

...Dennis

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