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

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.