18x12 backspacing question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ibinyth · 12-14-2019, 02:20 PM

Can I run a 18x12 with a 6" backspacing on a late model 70 c10 wider rear end? Truck has no bedfloor or tubs, just bedsides. How close would that get it to flush?

ibinyth · 12-15-2019, 05:08 AM

They also come in 5.5bs

Alternative is 18x11 with either 6bs or 5bs

**PGSigns** · 12-16-2019, 07:56 AM

You would need to pick the tire you want to run and use a tool like the ones listed in the link below. The tire is what you have to make fit and the tool will tell you the rim you need.
Jimmy
https://www.summitracing.com/search/...imulator-tools

SCOTI · 12-16-2019, 11:04 AM

The shorter width 6-lug 12bolts allow about ~10" of back space before you have clearance problems (if the wheel diameter clears) @ the suspension. I ran 15x14" wheels (9.75"BS??) w/widened tubs & the shorter width 12bolt

So, will your proposed combo's 'fit' with the wider housing? They can. Will they look right? Only way to know is to measure your set-up. I would bet if the truck is lower than stock height, there will be issues @ the bedside requiring more back spacing. My best WAG is you need closer to ~8" BS w/the wider rear housing if the truck is lowered & you don't want to have to worry about rubbing @ the bedside.

68Stepbed · 12-17-2019, 05:21 PM

What wheels are you looking at?

12-14-2019, 02:20 PM	#1
ibinyth Registered User Join Date: Jun 2018 Location: kannapolis north Carolina Posts: 29	18x12 backspacing question Can I run a 18x12 with a 6" backspacing on a late model 70 c10 wider rear end? Truck has no bedfloor or tubs, just bedsides. How close would that get it to flush?

12-15-2019, 05:08 AM	#2
ibinyth Registered User Join Date: Jun 2018 Location: kannapolis north Carolina Posts: 29	Re: 18x12 backspacing question They also come in 5.5bs Alternative is 18x11 with either 6bs or 5bs

12-16-2019, 07:56 AM	#3
PGSigns Senior Member Join Date: Jan 2011 Location: Hayes Va Posts: 4,569	Re: 18x12 backspacing question You would need to pick the tire you want to run and use a tool like the ones listed in the link below. The tire is what you have to make fit and the tool will tell you the rim you need. Jimmy https://www.summitracing.com/search/...imulator-tools __________________ 60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic

12-16-2019, 11:04 AM	#4
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,068	Re: 18x12 backspacing question The shorter width 6-lug 12bolts allow about ~10" of back space before you have clearance problems (if the wheel diameter clears) @ the suspension. I ran 15x14" wheels (9.75"BS??) w/widened tubs & the shorter width 12bolt So, will your proposed combo's 'fit' with the wider housing? They can. Will they look right? Only way to know is to measure your set-up. I would bet if the truck is lower than stock height, there will be issues @ the bedside requiring more back spacing. My best WAG is you need closer to ~8" BS w/the wider rear housing if the truck is lowered & you don't want to have to worry about rubbing @ the bedside. __________________ 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.*

12-17-2019, 05:21 PM	#5
68Stepbed Registered User Join Date: Mar 2005 Location: 10-Uh-See Posts: 5,609	Re: 18x12 backspacing question What wheels are you looking at? __________________ Matt 68 C10 stepside, LS1/700R4, TCI Engineering suspension system



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