15 x 12 backspacing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jj72c10 · 03-09-2011, 11:21 AM

I am getting ready to order either the new Rival rims or Rally rims from Billet Specialties. I have Mickey Thompson 29 x 15 x15 street radials and have cut the bed floor and added 4.5 inches to the factory tubs. It appears that a 7" backspace would work with my combo. Anyone else running 15 x 12's ona '72 fleetside with factory width rear?

Any input appreciated......

Thanks,

Jeff

gcburdic · 03-10-2011, 11:17 AM

A little help please

ChevLoRay · 03-10-2011, 02:10 PM

Don't think it'll help, but it may be useful. I have a '69, that I ran 15x10 Wheel Vintique rally wheels on. Stock axle width with a 5-inch backspace on the wheels. Didn't stick out past the sides of the fenders, nor did they ever rub on the inside of the wheel housings.

I think your stock-width axle housing is a tad (1-inch?) wider than mine. Based on what I know about mine, I'd think a minimum of -inches for backspace, but probably more correct is your thought about going with the 7-inch BS. If you have to special-order them, I understand making sure that what you get is what you need, so sending this up top for you.

jj72c10 · 03-10-2011, 03:16 PM

Thanks for the help guys!

Jeff

Richard H. · 03-10-2011, 05:30 PM

Odd...I have been searching today for the same size and from what I get from this chart and the wheels I had on my 71 ,7" bs would be pushing it.
Maybe 7 1/2 or 8 inch bs. I'm really interested in this myself.
https://www.rsracing.com/tech-wheel.html

QKENUF4U · 03-10-2011, 08:12 PM

15x14 corvette style rally w/ 10" bs 31x18.5x15 tire...when i had mine... couldnt fit on a tire machine to balance them and didnt have a bubble balancer...

67chevemall · 03-11-2011, 05:03 PM

I have 15X12 on my rear... I could measure the BS if you are stuck

bigguy69 · 03-11-2011, 09:08 PM

i am curious myself.

69Beauty · 03-11-2011, 10:18 PM

Curious as well.

OARNGESI · 03-12-2011, 01:54 AM

I had some that were 7.5 for a 70 6 lug rear
Posted via Mobile Device

Hottrucks · 03-12-2011, 06:50 AM

checck my build the info your looking for is there with a few pics....If you do what I did you'll have no issuse with the outside rubbing the fender until you get to the 18x31 with 29" tires you'll be fine

67chevemall · 03-12-2011, 10:06 AM

Well it has a been a cold winter so I went and lite a fire in the garage for the old girl.......I will measure the tire for ya... beer for breakfast..how can you go wrong...

Hottrucks · 03-12-2011, 10:18 AM

Quote:

Originally Posted by 67chevemall

beer for breakfast..how can you go wrong...

Going Ice fishing....lol

03-09-2011, 11:21 AM	#1
jj72c10 Registered User Join Date: Dec 2008 Location: Cedar Rapids, IA Posts: 24	15 x 12 backspacing I am getting ready to order either the new Rival rims or Rally rims from Billet Specialties. I have Mickey Thompson 29 x 15 x15 street radials and have cut the bed floor and added 4.5 inches to the factory tubs. It appears that a 7" backspace would work with my combo. Anyone else running 15 x 12's ona '72 fleetside with factory width rear? Any input appreciated...... Thanks, Jeff

03-10-2011, 11:17 AM	#2
gcburdic Restoration Virgin! Join Date: Jan 2008 Location: Huntersville, NC Posts: 8,298	Re: 15 x 12 backspacing A little help please __________________ Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present

03-10-2011, 02:10 PM	#3
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: 15 x 12 backspacing Don't think it'll help, but it may be useful. I have a '69, that I ran 15x10 Wheel Vintique rally wheels on. Stock axle width with a 5-inch backspace on the wheels. Didn't stick out past the sides of the fenders, nor did they ever rub on the inside of the wheel housings. I think your stock-width axle housing is a tad (1-inch?) wider than mine. Based on what I know about mine, I'd think a minimum of -inches for backspace, but probably more correct is your thought about going with the 7-inch BS. If you have to special-order them, I understand making sure that what you get is what you need, so sending this up top for you. Attached Images __________________ 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. Last edited by ChevLoRay; 03-10-2011 at 02:14 PM.

03-10-2011, 03:16 PM	#4
jj72c10 Registered User Join Date: Dec 2008 Location: Cedar Rapids, IA Posts: 24	Re: 15 x 12 backspacing Thanks for the help guys! Jeff

03-10-2011, 05:30 PM	#5
Richard H. Spanked once Join Date: Oct 2006 Location: Intheshop, Indiana Posts: 969	Re: 15 x 12 backspacing Odd...I have been searching today for the same size and from what I get from this chart and the wheels I had on my 71 ,7" bs would be pushing it. Maybe 7 1/2 or 8 inch bs. I'm really interested in this myself. https://www.rsracing.com/tech-wheel.html __________________ The ole 350 budget build.

03-10-2011, 08:12 PM	#6
QKENUF4U Senior Member Join Date: Jan 2005 Location: SUNNY WARM BIKE RIDING COTTONWOOD ARIZONA Posts: 2,097	Re: 15 x 12 backspacing 15x14 corvette style rally w/ 10" bs 31x18.5x15 tire...when i had mine... couldnt fit on a tire machine to balance them and didnt have a bubble balancer... Last edited by QKENUF4U; 03-12-2011 at 12:46 AM.

03-11-2011, 05:03 PM	#7
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	Re: 15 x 12 backspacing I have 15X12 on my rear... I could measure the BS if you are stuck __________________ 1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD

03-11-2011, 09:08 PM	#8
bigguy69 dazed and confused Join Date: Jul 2008 Location: marion nc Posts: 1,649	Re: 15 x 12 backspacing i am curious myself. __________________ members met: redbaron69, billsbowtie,nc67

03-11-2011, 10:18 PM	#9
69Beauty Registered User Join Date: Aug 2010 Location: North Dakota Posts: 279	Re: 15 x 12 backspacing Curious as well. __________________ 1969 C-10 LWB 388 SBC Vortec Heads 10:1 Lunati 60103 cam Weiand intake Quadrajet Carb 12 Bolt 3:73 posi 700r4 Hedman Headers 1998 Dodge Ram 1500 Reg. Cab Long Box 4X4 5.9L 183k miles 1956 Ford F-100 Longbed with Original 272 and 3OTT 1995 C1500 ECSB 6.5 Diesel 4l80e (Camper puller) 1997 Dodge 3/4 ECLB V10 (MPG machine)

03-12-2011, 01:54 AM	#10
OARNGESI Registered User Join Date: Sep 2008 Location: CASA GRANDE AZ Posts: 4,276	Re: 15 x 12 backspacing I had some that were 7.5 for a 70 6 lug rear Posted via Mobile Device __________________ 70 SWB STEPSIDE 70 BLAZER 09 challenger

03-12-2011, 06:50 AM	#11
Hottrucks Redefining LowBudget Join Date: Mar 2009 Location: lebanon Cow Hampshire Posts: 4,538	Re: 15 x 12 backspacing checck my build the info your looking for is there with a few pics....If you do what I did you'll have no issuse with the outside rubbing the fender until you get to the 18x31 with 29" tires you'll be fine __________________ 1970 C10 CST fleetside 472 ....big dreams little cash... http://67-72chevytrucks.com/vboard/s...d.php?t=335721 SunShine Syndicate.. Mikes Sandwich Fair Run OCT 8th 2011 http://www.thesandwichfair.com/html/...auto_show.html

03-12-2011, 10:06 AM	#12
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	Re: 15 x 12 backspacing Well it has a been a cold winter so I went and lite a fire in the garage for the old girl.......I will measure the tire for ya... beer for breakfast..how can you go wrong... __________________ 1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD



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