Maximum wheel backspacing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Back in Black · 03-08-2005, 03:00 PM

I plan to buy a set of Centerline Wheels 15x10" (back) and 15x8" (front) for my truck. I want the tires to be as far under the truck as possible. Does anyone have experience in the maxium backspacing for both front and back

thanks

jason

ehjorten · 03-08-2005, 04:25 PM

That completely depends on the size of tire you are going to use. Not sure on a widebox, but for my '68 the stock axle is 63" mounting flange-to-mounting flange. The width of the stepside bed on the inside of the wheelwell is 50-1/4". To be safe you should have 1" of clearance on the inside of the tire.

Back in Black · 03-08-2005, 07:04 PM

I am looking at a 50 series in the back and a 60 series in the front. I don't know all the new numbers yet. I think measuring is the best way.

CHEVYE · 03-08-2005, 07:19 PM

usually 4.5" is a good standard, maybe 5". i know both of those are good for sure but you may be able to get 5.5" or possibly more with a small sidewall.

RED67 · 03-09-2005, 08:49 AM

I know you can fit a 15 x 12 w/7.5 "of BS.....so if you have a 10" rim you could have 5.5" of BS....

SCOTI · 03-09-2005, 09:00 AM

If you mini-tub or tub it you can run alot more back-spacing so that makes a difference as well.

**lolife99** · 03-09-2005, 09:12 AM

Wheel diameter makes a difference on the front wheels. The rear is not as critical. You can run a 5" backspace up front with 17's,... but not with 15's. (rubs on the lower a-arms) Stay with a 4" backspace on the front.

03-08-2005, 03:00 PM	#1
Back in Black Registered User Join Date: Dec 2004 Location: Donnelly, MN Posts: 52	Maximum wheel backspacing I plan to buy a set of Centerline Wheels 15x10" (back) and 15x8" (front) for my truck. I want the tires to be as far under the truck as possible. Does anyone have experience in the maxium backspacing for both front and back thanks jason

03-08-2005, 04:25 PM	#2
ehjorten Registered User Join Date: Jan 2001 Location: Kirkland, WA, U.S.A. Posts: 32	That completely depends on the size of tire you are going to use. Not sure on a widebox, but for my '68 the stock axle is 63" mounting flange-to-mounting flange. The width of the stepside bed on the inside of the wheelwell is 50-1/4". To be safe you should have 1" of clearance on the inside of the tire. __________________ '68 Chevy Stepside in Frame-up Restoration process. 292 CID Clifford Performance Modified T56 6-speed Tranny Slammed, Custom IFS and IRS Money?...Too Much!

03-08-2005, 07:04 PM	#3
Back in Black Registered User Join Date: Dec 2004 Location: Donnelly, MN Posts: 52	Tire Size I am looking at a 50 series in the back and a 60 series in the front. I don't know all the new numbers yet. I think measuring is the best way.

03-08-2005, 07:19 PM	#4
CHEVYE my gas saver Join Date: Sep 2003 Location: Clarksville, TN Posts: 2,046	usually 4.5" is a good standard, maybe 5". i know both of those are good for sure but you may be able to get 5.5" or possibly more with a small sidewall. __________________ 85' SWB, 4.3/TH350, getting ready for paint 84`SWB, 462ci./TH400, cowl hood, 15" billet spec., flows, blazer buckets/console, flat black 71`SWB, project ebay feedback

03-09-2005, 08:49 AM	#5
RED67 Forever Grateful Join Date: Mar 2001 Location: Forney,Texas Posts: 779	I know you can fit a 15 x 12 w/7.5 "of BS.....so if you have a 10" rim you could have 5.5" of BS.... __________________ R.I.P Dad 04-07-42 - 05-27-09

03-09-2005, 09:00 AM	#6
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 21,998	If you mini-tub or tub it you can run alot more back-spacing so that makes a difference as well. __________________ 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.*

03-09-2005, 09:12 AM	#7
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,703	Wheel diameter makes a difference on the front wheels. The rear is not as critical. You can run a 5" backspace up front with 17's,... but not with 15's. (rubs on the lower a-arms) Stay with a 4" backspace on the front. __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823



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