Front Wheel Back Spacing? - Team Camaro Tech
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post #1 of 29 (permalink) Old Dec 1st, 16, 04:46 PM Thread Starter
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Front Wheel Back Spacing?

It's common knowledge it seems that the most back spacing on the rear wheels one can use is 4.5 inches for max rubber on the first gens. Mine's a 68 with stock leaf spring location and 15 inch rims.
What back spacing do I want for the front wheels? I can't seem to find this anywhere.
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post #2 of 29 (permalink) Old Dec 1st, 16, 06:14 PM
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Re: Front Wheel Back Spacing?

Quote:
Originally Posted by Moonpie View Post
It's common knowledge it seems that the most back spacing on the rear wheels one can use is 4.5 inches for max rubber on the first gens. Mine's a 68 with stock leaf spring location and 15 inch rims.
What back spacing do I want for the front wheels? I can't seem to find this anywhere.
Front and rear backspacing depends on the wheel width. Diameter is not relevant. What widths are you planning to run front and back?

Don

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post #3 of 29 (permalink) Old Dec 4th, 16, 07:18 AM Thread Starter
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Re: Front Wheel Back Spacing?

I would not agree with that. There is only so much back space room before a rim hits the shock mount on the rear. 4 1/2 inches.
Anyone know typical back spacing for the front wheels please?
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post #4 of 29 (permalink) Old Dec 4th, 16, 07:27 AM
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Re: Front Wheel Back Spacing?

Typical would be the same as the rear for the stock wheels. All four wheels and tires were the same size stock. If you go to a larger diameter wheel you usually go to a lower aspect ratio tire so the overall diameter is the same. Therefore the desired backspace would be the same.

If you go to a wider wheel then ideal BS will change.
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post #5 of 29 (permalink) Old Dec 4th, 16, 07:47 AM Thread Starter
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Re: Front Wheel Back Spacing?

I'm planning on Torque Thrust D's, 8 or 81/2 on rear with 275/60 or 50's. On the front the tallest tire i can get no more than a standard 78 series wide. I'd love to run my 28x7 Sportsmans but the street use would tear 'em up. So perhaps a 7" or 6" wide rim on the front.
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post #6 of 29 (permalink) Old Dec 4th, 16, 08:41 AM
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Re: Front Wheel Back Spacing?

I'd say a 225/70/15 would match up well with a 275/60/15. Backspacing on a 15x7 would be around 4-4.5". Just depends on whether you want the wheel more tucked or more pushed out towards the fender.

If you go with a 50 series rear, I'd drop the front to a 60 series to match.


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post #7 of 29 (permalink) Old Dec 4th, 16, 05:50 PM Thread Starter
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Re: Front Wheel Back Spacing?

I won't use 60's on the front. Kinda tough on the ball joints and boy am I gonna hear it for that.
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post #8 of 29 (permalink) Old Dec 4th, 16, 06:19 PM
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Re: Front Wheel Back Spacing?

Brent, what Is your setup up front if you dont mind my asking? Stock subframe?

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post #9 of 29 (permalink) Old Dec 5th, 16, 05:02 AM
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Re: Front Wheel Back Spacing?

Quote:
Originally Posted by Moonpie View Post
I would not agree with that. There is only so much back space room before a rim hits the shock mount on the rear. 4 1/2 inches.
Anyone know typical back spacing for the front wheels please?
Saw this on another forum. Best summary I have seen for first gen wheels. I have used backspacing of 5-7/8 with a 10 inch rear wheel and 5.75 backspacing with a 9.5 inch rear wheel.

"Keep your offset as close to +6mm on a first gen as possible and that should center the wheel between the subframe/fender and the frame rail/quarter panel as possible.

Ideal backspacing for maximum clearance is as follows:

17x7 = 4.25"bs
17x8 = 4.75"bs
17x8.5 = 5" bs
17x9 = 5.25"bs
17x9.5 = 5.5" bs

Wheel diameter is irrelevant, it's the same for any 17"/18"/19" wheel."

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post #10 of 29 (permalink) Old Dec 5th, 16, 08:34 AM
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Re: Front Wheel Back Spacing?

Quote:
Originally Posted by dhutton View Post
Saw this on another forum. Best summary I have seen for first gen wheels. I have used backspacing of 5-7/8 with a 10 inch rear wheel and 5.75 backspacing with a 9.5 inch rear wheel.

"Keep your offset as close to +6mm on a first gen as possible and that should center the wheel between the subframe/fender and the frame rail/quarter panel as possible.

Ideal backspacing for maximum clearance is as follows:

17x7 = 4.25"bs
17x8 = 4.75"bs
17x8.5 = 5" bs
17x9 = 5.25"bs
17x9.5 = 5.5" bs

Wheel diameter is irrelevant, it's the same for any 17"/18"/19" wheel."
Yeah, that was my post somewhere. Not sure which forum that was on.


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post #11 of 29 (permalink) Old Dec 5th, 16, 08:38 AM
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Re: Front Wheel Back Spacing?

Quote:
Originally Posted by 3d cad View Post
Brent, what Is your setup up front if you dont mind my asking? Stock subframe?
Stock subframe, SpeedTech Upper & Lower control arms, Hotchkis 2" lowering coil springs. Wilwood brakes add .19" to track width. 5" bs on an 18x8 w/ a 245/40/18, and needed a 5mm spacer not to rub on the front subframe. 4.75" would have been perfect.


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post #12 of 29 (permalink) Old Dec 5th, 16, 09:47 AM
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Re: Front Wheel Back Spacing?

The best way is to measure clearance with your existing wheel and tire. Then use one of the online comparison tools to determine wheel/tire combo that will meet you needs.

For example If you have a 6" wheel with 4 1/2" BS and your tire to fender clearance is 2" you know a 7" wheel with the same BS will give you 1" clearance or 1 1/2" if your BS is 5"

When looking at tires look at Section Width along with Tread Width as well as overall diameter.
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post #13 of 29 (permalink) Old Dec 5th, 16, 10:21 AM
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Re: Front Wheel Back Spacing?

Quote:
Originally Posted by 67Rally View Post
Yeah, that was my post somewhere. Not sure which forum that was on.
Lateral-g.

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1969 Camaro vert LS3 4L65E Ridetech level 2 - sold
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post #14 of 29 (permalink) Old Dec 5th, 16, 12:02 PM
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Re: Front Wheel Back Spacing?

I am under the impression that factory disc hubs have a mounting surface further out than drum hubs. Is that true?

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post #15 of 29 (permalink) Old Dec 5th, 16, 08:09 PM
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Re: Front Wheel Back Spacing?

Thanks for that info Brent. I need to get back rims soon to fit in the back and its a better deal if I can get all 4. With no front sheet metal that's kind of a scary proposition.

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