15X8's and 15X10's what backspacing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1LoC10 · 02-21-2008, 02:57 AM

I am going to be ordering some 15X8 fronts and 15X10 backs for my truck.. what backspacing should i get.. i did a search and cant find what i need... i want the wheels to be deep lip as possible but still be able to tuck when lowered..The rears will be a 295/50 and its a 69 short fleet with trailing arm suspension..Thanks

whatnow123 · 02-21-2008, 03:09 AM

Check my build thread for quite a few photos, but the wheels I have are 8 and 10 with 4.5 backspacing on all 4 corners.

chevguy7 · 02-22-2008, 07:53 AM

I was thinking about doing 15x8's with a 4" backspace and 15x10's with a 5" backspace...

im curious too, so here is a ttt

BCOWANWHEELS · 02-22-2008, 09:42 AM

4 1/2 " in the rear is max without rubbing problems

1LoC10 · 03-10-2008, 08:11 AM

so 4.5 on both the 8" and 10" will work.. anyone have pics of this set up?

1LoC10 · 03-17-2008, 10:58 PM

okey dokey, i guess ill do 4.5 all around..lol

70stroker · 03-18-2008, 07:14 AM

I have a 15x10 with 4.5 backspacing in the rear with 295-50-16 heres some pics. But i have 6's up fronts so that wont help.

'72customdeluxe · 03-08-2009, 06:11 AM

Quote:

Originally Posted by whatnow123

Check my build thread for quite a few photos, but the wheels I have are 8 and 10 with 4.5 backspacing on all 4 corners.

Isn't the 67-70 rear end narrower than the newer ones? I want to eventually put 10 wides on my 72 step but don't know if 4.5 backspace would stick out. It would only lowered about 3" so I want it to fill the fenders to the outside pretty much to the edge. Anybody have some advice?

SCOTI · 03-08-2009, 10:35 AM

Quote:

Originally Posted by 1LoC10

I am going to be ordering some 15X8 fronts and 15X10 backs for my truck.. what backspacing should i get.. i did a search and cant find what i need... i want the wheels to be deep lip as possible but still be able to tuck when lowered..The rears will be a 295/50 and its a 69 short fleet with trailing arm suspension..Thanks

Do you have wheels on there now? If so, use them as your baseline measurement & the add/subtract from there to get the answer that's right for your truck. I use cardboard to add width where I need it. Add to the rear to mimic back-spacing. Add to the front to mimic that deep dish look.

What works for one guy may not work for another. Not many people have the cash laying around for 'hoping' they'll work . ......

whatnow123 · 03-08-2009, 11:56 AM

Quote:

Originally Posted by '72customdeluxe

Isn't the 67-70 rear end narrower than the newer ones? I want to eventually put 10 wides on my 72 step but don't know if 4.5 backspace would stick out. It would only lowered about 3" so I want it to fill the fenders to the outside pretty much to the edge. Anybody have some advice?

Yep, the 67-70 rear is narrower by 3/4 a side which would make a huge difference. I just wonder how many people have bought wheels on advise from this board and then scratch thier head wondering why it doesn't look the same as the truck they were wondering about. I usually mention that I have a 67 rear as I don't like to see people waste time and money on incomplete advise (I did a write up on my build thread) and have tried to get other members to post which rear they have when giving advise about rear backspacing on thier truck as it's a popular topic, but it seems to always fall on deaf ears so I stopped doing it.

I even tried to start a thread for rear wheel spacing...(e.g. Type of bed, which rearend, width of rim and backspacing) as there are a few variables but again they would just post backspacing with no mention of short or long rear.

**Boog** · 03-08-2009, 01:54 PM

Has anybody noticed this is an old thread brought back up? Did 1lowc10 ever get those wheels? Also it is my understanding that a 15" front wheel with that much backspacing will scrub on the control arm in the lowered position. Is that not the case?

'72customdeluxe · 03-08-2009, 02:14 PM

Quote:

Originally Posted by SCOTI

Do you have wheels on there now? If so, use them as your baseline measurement & the add/subtract from there to get the answer that's right for your truck. I use cardboard to add width where I need it. Add to the rear to mimic back-spacing. Add to the front to mimic that deep dish look.

What works for one guy may not work for another. Not many people have the cash laying around for 'hoping' they'll work . ......

I currently have 73-87 15x8 truck rallys. I have no idea on the offset. They aren't custom or anything. They have 31x10.5 inch tires and if I put wider ones on it it might look better. I don't like how the front sits wider because the axle is narrower than the front. I plan on running a 29x12.5 or 28x12 tire. I'll have to measure when I get to that point. Does anyone know the specs on my current wheels above?

SCOTI · 03-08-2009, 02:46 PM

Typical truck ralleys are 15x8 w/4" back spacing.

'72customdeluxe · 03-11-2009, 10:23 PM

So when I eventually get to measuring the wheels couldn't I just add 2 inches to the backspacing measurement as I like the offset I have and the new ones would be 2 inches wider? Because backspace adds to the back right? They sit right at the edge of the fenders now.

SCOTI · 03-11-2009, 10:35 PM

Quote:

Originally Posted by '72customdeluxe

So when I eventually get to measuring the wheels couldn't I just add 2 inches to the backspacing measurement as I like the offset I have and the new ones would be 2 inches wider? Because backspace adds to the back right? They sit right at the edge of the fenders now.

That's correct.

timcrow00 · 03-11-2009, 11:53 PM

whats the difference between backspace and offset

stepn67 · 03-12-2009, 11:45 AM

This helped me understand difference between the two.
Name: wheel offset.jpg
Views: 778
Size: 26.6 KB

02-21-2008, 02:57 AM	#1
1LoC10 Insert Title Here Join Date: Feb 2006 Location: Dyer, Indiana Posts: 5,679	15X8's and 15X10's what backspacing I am going to be ordering some 15X8 fronts and 15X10 backs for my truck.. what backspacing should i get.. i did a search and cant find what i need... i want the wheels to be deep lip as possible but still be able to tuck when lowered..The rears will be a 295/50 and its a 69 short fleet with trailing arm suspension..Thanks __________________ BOBBY _69 SWB_ 1000 pics of 67-72's>> http://s193.photobucket.com/albums/z...-72/?start=all << Last edited by 1LoC10; 02-21-2008 at 02:58 AM.

02-21-2008, 03:09 AM	#2
whatnow123 Registered User Join Date: Oct 2006 Location: Arizona Posts: 835	Re: 15X8's and 15X10's what backspacing Check my build thread for quite a few photos, but the wheels I have are 8 and 10 with 4.5 backspacing on all 4 corners. __________________ 67 Short Step, 355, 700R 4.11 posi rear, 4/6 drop Discs on all 4 corners. Build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=219094

02-22-2008, 07:53 AM	#3
chevguy7 Registered User Join Date: Oct 2006 Location: Washington Posts: 316	Re: 15X8's and 15X10's what backspacing I was thinking about doing 15x8's with a 4" backspace and 15x10's with a 5" backspace... im curious too, so here is a ttt __________________ 1970 C10 - ECE 3.5/5 drop, dual exhaust with turbo mufflers, front discs http://67-72chevytrucks.com/vboard/s...d.php?t=272458 2000 Buick Regal GS - Supercharged 3.8 V6 240hp, 1/4 mile 15 seconds Last edited by chevguy7; 02-22-2008 at 07:54 AM.

02-22-2008, 09:42 AM	#4
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Re: 15X8's and 15X10's what backspacing 4 1/2 " in the rear is max without rubbing problems __________________ I BELIEVE IN JOHN 3:16

03-10-2008, 08:11 AM	#5
1LoC10 Insert Title Here Join Date: Feb 2006 Location: Dyer, Indiana Posts: 5,679	Re: 15X8's and 15X10's what backspacing so 4.5 on both the 8" and 10" will work.. anyone have pics of this set up? __________________ BOBBY _69 SWB_ 1000 pics of 67-72's>> http://s193.photobucket.com/albums/z...-72/?start=all <<

03-17-2008, 10:58 PM	#6
1LoC10 Insert Title Here Join Date: Feb 2006 Location: Dyer, Indiana Posts: 5,679	Re: 15X8's and 15X10's what backspacing okey dokey, i guess ill do 4.5 all around..lol __________________ BOBBY _69 SWB_ 1000 pics of 67-72's>> http://s193.photobucket.com/albums/z...-72/?start=all <<

03-18-2008, 07:14 AM	#7
70stroker Registered User Join Date: Jan 2007 Location: pittsburg kansas Posts: 894	Re: 15X8's and 15X10's what backspacing I have a 15x10 with 4.5 backspacing in the rear with 295-50-16 heres some pics. But i have 6's up fronts so that wont help. __________________ 70 GMC build: http://67-72chevytrucks.com/vboard/s...d.php?t=613130 Last edited by 70stroker; 03-18-2008 at 07:16 AM.

03-08-2009, 01:54 PM	#11
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,514	Re: 15X8's and 15X10's what backspacing Has anybody noticed this is an old thread brought back up? Did 1lowc10 ever get those wheels? Also it is my understanding that a 15" front wheel with that much backspacing will scrub on the control arm in the lowered position. Is that not the case? __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

03-08-2009, 02:46 PM	#13
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,064	Re: 15X8's and 15X10's what backspacing Typical truck ralleys are 15x8 w/4" back spacing. __________________ 67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... *Cubic inches is like Indiana Jones with a cheap pistol.*

03-11-2009, 10:23 PM	#14
'72customdeluxe Registered User Join Date: Jan 2008 Location: Tejas Posts: 691	Re: 15X8's and 15X10's what backspacing So when I eventually get to measuring the wheels couldn't I just add 2 inches to the backspacing measurement as I like the offset I have and the new ones would be 2 inches wider? Because backspace adds to the back right? They sit right at the edge of the fenders now. __________________ '72 cheyenne super step, '05 long bed gmc

03-11-2009, 11:53 PM	#16
timcrow00 Registered User Join Date: Mar 2009 Location: mulvane, KS Posts: 200	Re: 15X8's and 15X10's what backspacing whats the difference between backspace and offset

03-12-2009, 11:45 AM	#17
stepn67 Junior Member Join Date: Dec 2002 Location: Tucson, AZ Posts: 140	Re: 15X8's and 15X10's what backspacing This helped me understand difference between the two.



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