Back Spacing for Factory Ralley Wheel? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**70cst** · 08-15-2010, 02:56 PM

Ok all you experts...anyone know what the factory BS is on the GM Ralley Wheel? My TT II's have a 4 1/2" BS and I want to go 16x7 but with less BS so I can reinstall my 2" drop springs.

The 2" Drop Spindles and 2" Drop Springs do not work well with my 16x8 TT II's with the 4 1/2 " BS. I have rubing issues.

cdowns · 08-15-2010, 04:23 PM

i think most of those ralleys are 41/2 or 43/4 backspace

Blazer1970 · 08-16-2010, 06:05 AM

I am pretty sure that the 15 X 8 truck ralleys are about 3 5/8" backspacing.

**lolife99** · 08-16-2010, 06:16 AM

The 15x8 truck ralleys have a 4" BS.
The 15x7's have a 3-5/8" BS.

70cst,... do you have any pics of the problem area?

**70cst** · 08-16-2010, 08:07 AM

Quote:

Originally Posted by lolife99

The 15x8 truck ralleys have a 4" BS.
The 15x7's have a 3-5/8" BS.

70cst,... do you have any pics of the problem area?

Thanks...that's what I needed to know.

08-15-2010, 02:56 PM	#1
70cst Senior Member Join Date: Feb 2001 Location: New Madison, Ohio Posts: 21,365	Back Spacing for Factory Ralley Wheel? Ok all you experts...anyone know what the factory BS is on the GM Ralley Wheel? My TT II's have a 4 1/2" BS and I want to go 16x7 but with less BS so I can reinstall my 2" drop springs. The 2" Drop Spindles and 2" Drop Springs do not work well with my 16x8 TT II's with the 4 1/2 " BS. I have rubing issues. __________________ A husband can be right...or...A husband can be happy. 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder!

08-15-2010, 04:23 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Back Spacing for Factory Ralley Wheel? i think most of those ralleys are 41/2 or 43/4 backspace __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

08-16-2010, 06:05 AM	#3
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,510	Re: Back Spacing for Factory Ralley Wheel? I am pretty sure that the 15 X 8 truck ralleys are about 3 5/8" backspacing. __________________ Tim

08-16-2010, 06:16 AM	#4
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,696	Re: Back Spacing for Factory Ralley Wheel? The 15x8 truck ralleys have a 4" BS. The 15x7's have a 3-5/8" BS. 70cst,... do you have any pics of the problem area? __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 Last edited by lolife99; 08-16-2010 at 06:20 AM.



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