quick backspacing question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

SGJ72 · 01-22-2016, 07:14 PM

thinking about putting some 15x8 Rallys on my 72, but these wheels have a 4.5" backspace. as I understand, that's so they can tuck under better, yes? so I can run a taller tire? I haven't lowered the truck any yet, and may not get to that for a while. so, running this backspace, it's not going to make the truck look weird, is it? like, too narrow a track? if so, I could run down some 15x8 Rallys with no backspace, probably.

I searched all through here for an answer to this, and probably read it sixteen times, but I wanted to be sure before I do it. thanks for any help.

**lolife99** · 01-22-2016, 07:56 PM

Are you sure they are 4.5" backspace?
(pics?)
If so they will rub on your tierod
4" is usually the max backspace on a 15" diameter wheel up front.

SGJ72 · 01-22-2016, 08:02 PM

man, don't want that rubbing action. hadn't even considered that. thanks. and, don't have them yet, was only considering them:

https://cosprings.craigslist.org/wto/5409519546.html

**lolife99** · 01-22-2016, 08:41 PM

Quote:

Originally Posted by SGJ72

man, don't want that rubbing action. hadn't even considered that. thanks. and, don't have them yet, was only considering them:

https://cosprings.craigslist.org/wto/5409519546.html

Those are 15x8 truck rally wheels.
They have a 4" backspace.
NOT 4.5"

SGJ72 · 01-22-2016, 09:53 PM

good to know, thanks. so, he's got the specs in the listing wrong? I'm guessing if 4.5" will rub, though, then 4" might as well. may just wait till some with no offset show up, I guess.

Kennuck · 01-22-2016, 10:09 PM

An 8" wide rim with 4.0 backspacing is 0 Offset.

SGJ72 · 01-22-2016, 10:18 PM

ah. so it's just a stock-normal rally rim, then? guess that wouldn't rub. cool. maybe I'll pick these up. thanks.

01-22-2016, 07:14 PM	#1
SGJ72 Registered User Join Date: Sep 2015 Location: Boulder, CO (SLC, UT for the moment) Posts: 23	quick backspacing question thinking about putting some 15x8 Rallys on my 72, but these wheels have a 4.5" backspace. as I understand, that's so they can tuck under better, yes? so I can run a taller tire? I haven't lowered the truck any yet, and may not get to that for a while. so, running this backspace, it's not going to make the truck look weird, is it? like, too narrow a track? if so, I could run down some 15x8 Rallys with no backspace, probably. I searched all through here for an answer to this, and probably read it sixteen times, but I wanted to be sure before I do it. thanks for any help. __________________ no build thread, but I could probably rig together a bill-thread

01-22-2016, 07:56 PM	#2
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,691	Re: quick backspacing question Are you sure they are 4.5" backspace? (pics?) If so they will rub on your tierod 4" is usually the max backspace on a 15" diameter wheel up front. __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

01-22-2016, 08:02 PM	#3
SGJ72 Registered User Join Date: Sep 2015 Location: Boulder, CO (SLC, UT for the moment) Posts: 23	Re: quick backspacing question man, don't want that rubbing action. hadn't even considered that. thanks. and, don't have them yet, was only considering them: https://cosprings.craigslist.org/wto/5409519546.html __________________ no build thread, but I could probably rig together a bill-thread

01-22-2016, 09:53 PM	#5
SGJ72 Registered User Join Date: Sep 2015 Location: Boulder, CO (SLC, UT for the moment) Posts: 23	Re: quick backspacing question good to know, thanks. so, he's got the specs in the listing wrong? I'm guessing if 4.5" will rub, though, then 4" might as well. may just wait till some with no offset show up, I guess. __________________ no build thread, but I could probably rig together a bill-thread

01-22-2016, 10:09 PM	#6
Kennuck Registered User Join Date: Oct 2013 Location: Dresden, Ontario Posts: 647	Re: quick backspacing question An 8" wide rim with 4.0 backspacing is 0 Offset. __________________ 1970 Short Wide 5.3 4L60E BlackBear tune 3:73 gears, Boyd's Tank 2.5 / 4 drop 5 lug disc brakes Vintage Air 18x8 Ridlers 255/55 frt. 18x9.5 275/60 rear

01-22-2016, 10:18 PM	#7
SGJ72 Registered User Join Date: Sep 2015 Location: Boulder, CO (SLC, UT for the moment) Posts: 23	Re: quick backspacing question ah. so it's just a stock-normal rally rim, then? guess that wouldn't rub. cool. maybe I'll pick these up. thanks. __________________ no build thread, but I could probably rig together a bill-thread

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