WILL THESE FIT, backspacing for new rims - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Dropt72Shortbed · 11-16-2002, 03:05 AM

ive found a killer deal locally on a set of billet 18s

front are 8" with 5.25" bs rears are 9.5 with 5.75"bs

i have a fleetside 72 with the stock 3.73 posi 12 bolt.

i think this backspacing is for the 88-98 trucks, will it fit on my 72? ive the backspacings only off like .25 i can run small spacers

ChevLoRay · 11-16-2002, 08:41 AM

Backspace on stock wheels for 88-98's is 4.25 inches. Because of the width of the wheels you cited, they seem to have a bit more.

I lowered my '69 with Early Classic Enterprises components. It had been running a set of 15x8's, but I never checked the back space (offset). When I did the lowering and converted to discs on front, I had to go to a 15x7 wheel to keep them from sticking outside the front fender line....discs added to the front track.

Based on my experience, you MAY see that these do the same, but I do not really know.

We lowered my sons' 96 GMC using DJM spindles and had to go to a wheel with no more than 3.5 inches of back space. He had a set of 15x8's on it that had the stock back spacing. It sat in the garage for about a week while we waited on two matching wheels from California. The lower control arms would contact the back of the wheel and prevented it from being driven EXCEPT in a straight line.

However, the diameter of the wheels you cited will not present that problem, because they are large enough to clear the A-arms.
All you need to watch is that they clear the wheel openings when you bottom out the suspension, or at least that is what I think.

turmoline · 11-16-2002, 11:39 AM

I am running 8 @ front with a 4.5" backspacing and 9.5 @ back with a 5.25 backspacing. The back wheels you are wanting to run should work because there is a lot of room towards the inside of the wheel, but your dish won't be that deep. I assume you're tucking the wheel. Not sure about the fronts, mine sit @ 2" from the frame rail when turned all the way to the left or right. Iam also running mustang II suspension and don't have the shock interfering. plus my overall tracking width is narrower than stock. slammed67 would know about the fronts. What tires are you planning on running?

brad2 · 11-16-2002, 12:29 PM

I have 20x8 with 4.5 bs on the front and I think the fit is pretty good. The back is a 20x10 with 5 bs but it really isn't enough on my Jimmy to tuck some tire. I don't know if there would be a difference on the back between a truck and a jimmy.

11-16-2002, 03:05 AM	#1
Dropt72Shortbed Registered User Join Date: May 2002 Location: Huntington Beach CA Posts: 678	WILL THESE FIT, backspacing for new rims ive found a killer deal locally on a set of billet 18s front are 8" with 5.25" bs rears are 9.5 with 5.75"bs i have a fleetside 72 with the stock 3.73 posi 12 bolt. i think this backspacing is for the 88-98 trucks, will it fit on my 72? ive the backspacings only off like .25 i can run small spacers

11-16-2002, 08:41 AM	#2
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Backspace on stock wheels for 88-98's is 4.25 inches. Because of the width of the wheels you cited, they seem to have a bit more. I lowered my '69 with Early Classic Enterprises components. It had been running a set of 15x8's, but I never checked the back space (offset). When I did the lowering and converted to discs on front, I had to go to a 15x7 wheel to keep them from sticking outside the front fender line....discs added to the front track. Based on my experience, you MAY see that these do the same, but I do not really know. We lowered my sons' 96 GMC using DJM spindles and had to go to a wheel with no more than 3.5 inches of back space. He had a set of 15x8's on it that had the stock back spacing. It sat in the garage for about a week while we waited on two matching wheels from California. The lower control arms would contact the back of the wheel and prevented it from being driven EXCEPT in a straight line. However, the diameter of the wheels you cited will not present that problem, because they are large enough to clear the A-arms. All you need to watch is that they clear the wheel openings when you bottom out the suspension, or at least that is what I think. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

11-16-2002, 11:39 AM	#3
turmoline Registered User Join Date: Jul 2001 Location: santa cruz, Calif. U.S. Posts: 166	I am running 8 @ front with a 4.5" backspacing and 9.5 @ back with a 5.25 backspacing. The back wheels you are wanting to run should work because there is a lot of room towards the inside of the wheel, but your dish won't be that deep. I assume you're tucking the wheel. Not sure about the fronts, mine sit @ 2" from the frame rail when turned all the way to the left or right. Iam also running mustang II suspension and don't have the shock interfering. plus my overall tracking width is narrower than stock. slammed67 would know about the fronts. What tires are you planning on running?

11-16-2002, 12:29 PM	#4
brad2 Registered User Join Date: Feb 2001 Location: edmond, ok Posts: 1,058	I have 20x8 with 4.5 bs on the front and I think the fit is pretty good. The back is a 20x10 with 5 bs but it really isn't enough on my Jimmy to tuck some tire. I don't know if there would be a difference on the back between a truck and a jimmy.



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