Custom back spacing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1bad396ss · 03-15-2013, 11:15 PM

What would be the optimal backspacing for 18x8 front and 18x10 wheels on a 72 with the wide rear? Assuming the truck is 4/6 dropped with ECE Kit.

I am curious if anyone would deviate from the normal acceptable off the shelf specs if a totally custom backspace is allowed.

I am looking at the American Racing VN327 Rally wheels.

Any help or info is greatly appreciated. I also hope these would work with McGauphy Big Breaks front and rear (13 inch rotors).

1bad396ss · 03-20-2013, 10:36 PM

I have come up with a 4 inch backspace for the front 18x8's and 5.25 inch backspace for the rear 18x10's. If anyone has any other recommendations, I would certainly like your imput and/or pictures.

**lolife99** · 03-20-2013, 11:41 PM

I like 5" bs on a 18x8 up front.
5.5" bs on a 18x10 with the wider 71-72 rearend.
But that's what I like.

Remember a 8" wheel will measure 9".
10" wheel will measure 11".
Posted via Mobile Device

Pro Performance · 03-20-2013, 11:47 PM

It all depends on how you want the wheels to fit on the truck. I would say a 4.75" up front, and 5.5" on the rear... But all personal preference. The McGaughys brakes don't have a lot of caliper offset, so you will be Ok there.

We are an American Racing dealer, so let me know if we can help you out further.

Travis
Posted via Mobile Device

oldno7 · 03-21-2013, 06:16 PM

It is the original rearend im assuming i believe its diff with the 67-68 rearends, they are narrower in width so im thinking 5 inch backspacing for the rear.

Pro Performance · 03-21-2013, 06:24 PM

IF it's the original rear end, the wider 71-72, then I would run the 5.5" in the rear.

oldno7 · 03-21-2013, 09:20 PM

lolife99 would you happen to have pics of a 67 fleet 20x10 with 5x5 backspacing, and a 72 fleet 20x10 with 5x5.5

**lolife99** · 03-21-2013, 09:21 PM

Quote:

Originally Posted by oldno7

lolife99 would you happen to have pics of a 67 fleet 20x10 with 5x5 backspacing, and a 72 fleet 20x10 with 5x5.5

Do you mean narrow rearend with 5" BS and wider rearend with 5.5" BS?

**lolife99** · 03-21-2013, 09:27 PM

Early 67-69 rearend with with 20x10 (4.75" BS)

**lolife99** · 03-21-2013, 09:28 PM

71-72 wider rearend with a 20x10 (5.5" BS)

Pro Performance · 03-21-2013, 09:42 PM

Here is a 20x10 with the wider rear end.

**lolife99** · 03-21-2013, 09:44 PM

Quote:

Originally Posted by Pro Performance

Here is a 20x10 with the wider rear end.

What backspace?

oldno7 · 03-21-2013, 10:04 PM

Thx you sir, these look awesome.

Pro Performance · 03-21-2013, 10:26 PM

5.5" backspace.
Posted via Mobile Device

1bad396ss · 03-22-2013, 08:57 PM

Thanks for the recommendations. I appreciate it.

03-15-2013, 11:15 PM	#1
1bad396ss Registered User Join Date: Jul 2012 Location: STL MO Posts: 85	Custom back spacing What would be the optimal backspacing for 18x8 front and 18x10 wheels on a 72 with the wide rear? Assuming the truck is 4/6 dropped with ECE Kit. I am curious if anyone would deviate from the normal acceptable off the shelf specs if a totally custom backspace is allowed. I am looking at the American Racing VN327 Rally wheels. Any help or info is greatly appreciated. I also hope these would work with McGauphy Big Breaks front and rear (13 inch rotors). Last edited by 1bad396ss; 03-15-2013 at 11:20 PM. Reason: Hit submit too early!!!

03-20-2013, 10:36 PM	#2
1bad396ss Registered User Join Date: Jul 2012 Location: STL MO Posts: 85	Re: Custom back spacing I have come up with a 4 inch backspace for the front 18x8's and 5.25 inch backspace for the rear 18x10's. If anyone has any other recommendations, I would certainly like your imput and/or pictures.

03-20-2013, 11:41 PM	#3
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,700	Re: Custom back spacing I like 5" bs on a 18x8 up front. 5.5" bs on a 18x10 with the wider 71-72 rearend. But that's what I like. Remember a 8" wheel will measure 9". 10" wheel will measure 11". Posted via Mobile Device __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

03-20-2013, 11:47 PM	#4
Pro Performance Registered User Join Date: Aug 2010 Location: AZ Posts: 3,069	Re: Custom back spacing It all depends on how you want the wheels to fit on the truck. I would say a 4.75" up front, and 5.5" on the rear... But all personal preference. The McGaughys brakes don't have a lot of caliper offset, so you will be Ok there. We are an American Racing dealer, so let me know if we can help you out further. Travis Posted via Mobile Device

03-21-2013, 06:16 PM	#5
oldno7 Registered User Join Date: Jan 2007 Location: Ill. Posts: 584	Re: Custom back spacing It is the original rearend im assuming i believe its diff with the 67-68 rearends, they are narrower in width so im thinking 5 inch backspacing for the rear. __________________ Hi everyone, It's nice to know there's other people just as crazy about these old trucks as I am. oldno7

03-21-2013, 06:24 PM	#6
Pro Performance Registered User Join Date: Aug 2010 Location: AZ Posts: 3,069	Re: Custom back spacing IF it's the original rear end, the wider 71-72, then I would run the 5.5" in the rear.

03-21-2013, 09:20 PM	#7
oldno7 Registered User Join Date: Jan 2007 Location: Ill. Posts: 584	Re: Custom back spacing lolife99 would you happen to have pics of a 67 fleet 20x10 with 5x5 backspacing, and a 72 fleet 20x10 with 5x5.5 __________________ Hi everyone, It's nice to know there's other people just as crazy about these old trucks as I am. oldno7

03-21-2013, 09:27 PM	#9
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,700	Re: Custom back spacing Early 67-69 rearend with with 20x10 (4.75" BS) Attached Images __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

03-21-2013, 09:28 PM	#10
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,700	Re: Custom back spacing 71-72 wider rearend with a 20x10 (5.5" BS) Attached Images __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

03-21-2013, 09:42 PM	#11
Pro Performance Registered User Join Date: Aug 2010 Location: AZ Posts: 3,069	Re: Custom back spacing Here is a 20x10 with the wider rear end.

03-21-2013, 10:04 PM	#13
oldno7 Registered User Join Date: Jan 2007 Location: Ill. Posts: 584	Re: Custom back spacing Thx you sir, these look awesome. __________________ Hi everyone, It's nice to know there's other people just as crazy about these old trucks as I am. oldno7

03-21-2013, 10:26 PM	#14
Pro Performance Registered User Join Date: Aug 2010 Location: AZ Posts: 3,069	Re: Custom back spacing 5.5" backspace. Posted via Mobile Device

03-22-2013, 08:57 PM	#15
1bad396ss Registered User Join Date: Jul 2012 Location: STL MO Posts: 85	Re: Custom back spacing Thanks for the recommendations. I appreciate it.

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