![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
![]() |
#1 |
Registered User
Join Date: Aug 2016
Location: Coast
Posts: 180
|
Backspacing question for 8 lug C20
I just got a 71 C20 with aluminum 16.5 wheels on it which I'd like to replace. I searched the forum here and I like the look of the 265/75/16 on 16x8 combo up front. So for you guys who are running this setup, can you tell me what your backspacing is? Thanks.
|
![]() |
![]() |
![]() |
#2 |
The Niner
![]() Join Date: Nov 2010
Location: Broad Brook, CT
Posts: 2,494
|
Re: Backspacing question for 8 lug C20
I've got 16 x 7 F#rd van rims that have a backspace of 4 3/4"
__________________
"A good racer is one whose head is in communication with his balls." - Richie Evans 1970 C/20 - 402/TH400/3.54s - 74K miles 2003 GMC Sierra 2500 - Wheatland Yellow Niner Progression Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=697183 Classic Trucks article: https://www.motortrend.com/features/...et-c20-driven/ |
![]() |
![]() |
![]() |
#3 |
Registered User
Join Date: Aug 2016
Location: Coast
Posts: 180
|
Re: Backspacing question for 8 lug C20
That's a nice looking fit. Are those 265/75/16 tires all the way around?
|
![]() |
![]() |
![]() |
#4 |
The Niner
![]() Join Date: Nov 2010
Location: Broad Brook, CT
Posts: 2,494
|
Re: Backspacing question for 8 lug C20
Yes they are.
__________________
"A good racer is one whose head is in communication with his balls." - Richie Evans 1970 C/20 - 402/TH400/3.54s - 74K miles 2003 GMC Sierra 2500 - Wheatland Yellow Niner Progression Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=697183 Classic Trucks article: https://www.motortrend.com/features/...et-c20-driven/ |
![]() |
![]() |
![]() |
#5 |
Registered User
Join Date: Jan 2014
Location: SoCal
Posts: 281
|
Re: Backspacing question for 8 lug C20
These wheels came off of my Brother-in-Laws '88 Suburban. They are 16x6.5 with 4.5 back spacing running 245/75/16.
|
![]() |
![]() |
![]() |
#6 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,721
|
Re: Backspacing question for 8 lug C20
I ran 265 75 16 on my 70 GMC 2500 on Alcoa 16x7 rims and that was a good fit. The backspacing was 4" I believe which would be zero offset on a 7" rim.
In general, zero offset a good fit on these trucks all around. My '69 short step has 17x8 4.5" bs front and 17x9 5" bs rear. In both instances this is zero offset. That means the wheel mounting surface (WMS) is equal distance from the front of the rim and back of the rim. Wheel width is measured between the beads but backspace is measured from the actual overall width of the rim which is usually 1/2" or close enough to use that #. Offset is the distance that the WMS is displaced from the centerline. Positive offset is what you see on front drive cars where there is a lot of backspace relative to width while negative offset is what you see on most rear vintage rear drive cars.
__________________
44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
![]() |
![]() |
![]() |
#7 |
Registered User
Join Date: Aug 2016
Location: Coast
Posts: 180
|
Re: Backspacing question for 8 lug C20
Cool. I appreciate the replies. Are you guys both running the Dana 60 rearend?
My back tires are BFG 33/12.5/16.5. I think they look just right so I was going to just try to find the equivalent in a 16" tire for the back. It's the front that don't look right. I want to get the look I'm looking for but want to make sure they don't rub. Right now I've got these front tires which read 9.5/16.5 but I can't find the diameter marked anywhere on the tire. I measured them and they are around 29", which looks a little too small in my opinion. |
![]() |
![]() |
![]() |
#8 |
Registered User
Join Date: Jan 2014
Location: SoCal
Posts: 281
|
Re: Backspacing question for 8 lug C20
|
![]() |
![]() |
![]() |
#9 |
The Niner
![]() Join Date: Nov 2010
Location: Broad Brook, CT
Posts: 2,494
|
Re: Backspacing question for 8 lug C20
I'm running an Eaton rear.
__________________
"A good racer is one whose head is in communication with his balls." - Richie Evans 1970 C/20 - 402/TH400/3.54s - 74K miles 2003 GMC Sierra 2500 - Wheatland Yellow Niner Progression Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=697183 Classic Trucks article: https://www.motortrend.com/features/...et-c20-driven/ |
![]() |
![]() |
![]() |
#10 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,721
|
Re: Backspacing question for 8 lug C20
265 75 16 are 31.6" in OD give or take a little. They have a 10.4" section width. A 255 85 16 is 10" section width and 33" tall. A 285 75 16 is 11.2" section and is 32.8" tall.
I found the 265 75 16 an excellent fit on my C2500 big block truck with disc conversion and the Dana 60 on leafs in the rear. I ran ECE 1 1/2" lowering shackles in the back for a more level look without changing anything else.
__________________
44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
![]() |
![]() |
![]() |
#11 |
Registered User
Join Date: Jul 2013
Location: Winnsboro Texas
Posts: 367
|
Re: Backspacing question for 8 lug C20
I am using these wheels https://www.summitracing.com/parts/w...0804/overview/
16x8 with 4" backs spacing. 265/75/16 all the way around. (Measure right at 31" once installed) New 3/4 springs all the way around. Very happy with the look and drive.
__________________
The bitterness of poor quality lingers long after the sweetness of a low price is forgotten. |
![]() |
![]() |
![]() |
#12 |
Registered User
Join Date: Jul 2013
Location: Winnsboro Texas
Posts: 367
|
Re: Backspacing question for 8 lug C20
This is the only side view pic I have to give you an idea how far they stick out.
Hope this helps
__________________
The bitterness of poor quality lingers long after the sweetness of a low price is forgotten. |
![]() |
![]() |
![]() |
#13 |
Cool Truck
Join Date: Dec 2008
Location: Bowie,MD
Posts: 1,869
|
Re: Backspacing question for 8 lug C20
I run these 16x8s with 265/75/16 tires and 4.25 backspacing
__________________
1968 Chevrolet C20 Longhorn "Cool Truck" 1937 Chevrolet Pickup - Project Looking for a patina'd 68 50th Anniversary longbed |
![]() |
![]() |
![]() |
#14 | |
Registered User
Join Date: Aug 2016
Location: Coast
Posts: 180
|
Re: Backspacing question for 8 lug C20
Quote:
![]()
__________________
-Jim 71 Chevrolet C20 94 GMC Yukon 4x4 ![]() |
|
![]() |
![]() |
![]() |
#15 |
Registered User
Join Date: Jul 2013
Location: Winnsboro Texas
Posts: 367
|
Re: Backspacing question for 8 lug C20
They come powder coated black. I painted mine white. Before the paint even dried, I remember thinking 'dang, maybe I should have left them black...just to see what they looked like....)
![]() I have bought,sold,traded, to many parts over the years to remember where I got the hubcaps from. I do know that the price of them seems to be going through the roof lately so I usually take them off whenever I go to the big city so they don't get stolen.
__________________
The bitterness of poor quality lingers long after the sweetness of a low price is forgotten. |
![]() |
![]() |
![]() |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|