15x12 backspacing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

miket · 10-30-2003, 12:44 AM

Just thinking online.....does anyone have any comments on backspacing/offset for pair of 15X12 wheels for the rear of 71 Cheyenne fleetside longbed? I would really like to keep them insode the wheel well. Tires will be 325/50/15s.

low 84 · 10-30-2003, 01:42 AM

well if you are keeping your axle stock (i.e. not narrowing it) and you want the outside of the 325/50 to be approximatly in the same position of your current tire. then its pretty easy. say you have a 15X8 with 4.5 backspace and you want to go to a 15X12. just add the extra width of the wheel to the backspace, this effectively puts all of that wider rubber inward of where you current tires are now. the 12 ich wheel is 4 inches wider than the 8 so add 4 inches to the backspace. 8.5 backspace on the 12 inch wheel. this wheel would have to be custom made and you would have to look out to make sure its not gonna rub your frame or springs on the inside. i don't think i've ever seen a 15X12 on a non narrowed axle that sits inside the fender. thats alot of wheel. reason i am going with 15X10's with a 325/50 bfg drag radial

low 84 · 10-30-2003, 02:41 AM

i've been doing some research (b/c i'm wanting some custom offset 15x10 truck rallies made for the rear of mine) and i found this chart on stockton wheels website. it shows the backspace they can custom make wheels of a particlular width for. so you could actulay get 12's with 8.5 b.s. and shove all that tire inboard. thats the sleeper look i'd liek to have with mine

miket · 10-30-2003, 06:36 AM

thanks Ryan....I have 15X10's now but thought 12's would be cool.

67sub · 10-30-2003, 09:03 AM

A freind of mine has 15x12 welds on his 72, with 7.5 inch backspacing. The suspension is all stock and clears fine but you need to mini tub it or widen the wheelwell about three inches so you don't rub on the inside.

butter · 10-30-2003, 09:15 AM

More info anybody I am thinking about doing the same thing.

miket · 10-30-2003, 11:47 AM

67:

What size tire was your friend running on his truck?

Can you get any pics?

Adam12 · 10-30-2003, 03:07 PM

I would also like to know the tire size and see some pics of possable.
Thanks
adam

67sub · 10-30-2003, 04:33 PM

miket and adam12 - I'll try to get some info and pics tomorrow night.

miket · 10-30-2003, 04:36 PM

Thanks 67 I really appreciate it.

miket · 11-09-2003, 02:51 PM

67,

Any success on pics?

butter · 11-10-2003, 12:32 AM

TTT

butter · 11-11-2003, 12:35 PM

TTT

Col Clank · 01-27-2007, 11:54 PM

Ttt

1968SWBBigBlock · 01-28-2007, 01:32 PM

Here are 2 shots of my truck
18.5" Mickey's
The bed has been mini tubbed - the frame, shock location etc is all stock.
The wheels are factory rally wheel with a spacer inserted into, just what you folks have been talking about.
I like this since I can always take the truck back to "stock" is I wanted to and for know I get a ton of thumbs up

10-30-2003, 12:44 AM	#1
miket Registered User Join Date: Jan 2003 Location: Seattle WA Posts: 1,466	15x12 backspacing Just thinking online.....does anyone have any comments on backspacing/offset for pair of 15X12 wheels for the rear of 71 Cheyenne fleetside longbed? I would really like to keep them insode the wheel well. Tires will be 325/50/15s. __________________ FocuzTech Performance Evergreen Protective Coatings Gatorhyde...the best kept secret in spray in bed lining & protection

10-30-2003, 01:42 AM	#2
low 84 Registered User Join Date: Jan 2002 Location: Houston, TX Posts: 2,144	well if you are keeping your axle stock (i.e. not narrowing it) and you want the outside of the 325/50 to be approximatly in the same position of your current tire. then its pretty easy. say you have a 15X8 with 4.5 backspace and you want to go to a 15X12. just add the extra width of the wheel to the backspace, this effectively puts all of that wider rubber inward of where you current tires are now. the 12 ich wheel is 4 inches wider than the 8 so add 4 inches to the backspace. 8.5 backspace on the 12 inch wheel. this wheel would have to be custom made and you would have to look out to make sure its not gonna rub your frame or springs on the inside. i don't think i've ever seen a 15X12 on a non narrowed axle that sits inside the fender. thats alot of wheel. reason i am going with 15X10's with a 325/50 bfg drag radial __________________ '51 F100, backhalf with a narrowed 9 and coil overs, 18.5" mickeys, monte front clip, +400" sbc in the works '05 1500 Crew Cab RIP '84 swb 5/7 drop, solid cammed 408 w/ fully ported dart heads, th350 w/ 10 inch hughes, 12 bolt w/ 3.73 richmonds and a locker '80 swb 4x4 in progress: 7" lift, 350 th350/np205, d44 and 1.5" ORD tie rod, 14BFF w/discs , armored diff covers, 40" MTR's

10-30-2003, 02:41 AM	#3
low 84 Registered User Join Date: Jan 2002 Location: Houston, TX Posts: 2,144	i've been doing some research (b/c i'm wanting some custom offset 15x10 truck rallies made for the rear of mine) and i found this chart on stockton wheels website. it shows the backspace they can custom make wheels of a particlular width for. so you could actulay get 12's with 8.5 b.s. and shove all that tire inboard. thats the sleeper look i'd liek to have with mine __________________ '51 F100, backhalf with a narrowed 9 and coil overs, 18.5" mickeys, monte front clip, +400" sbc in the works '05 1500 Crew Cab RIP '84 swb 5/7 drop, solid cammed 408 w/ fully ported dart heads, th350 w/ 10 inch hughes, 12 bolt w/ 3.73 richmonds and a locker '80 swb 4x4 in progress: 7" lift, 350 th350/np205, d44 and 1.5" ORD tie rod, 14BFF w/discs , armored diff covers, 40" MTR's

10-30-2003, 06:36 AM	#4
miket Registered User Join Date: Jan 2003 Location: Seattle WA Posts: 1,466	thanks Ryan....I have 15X10's now but thought 12's would be cool. __________________ FocuzTech Performance Evergreen Protective Coatings Gatorhyde...the best kept secret in spray in bed lining & protection

10-30-2003, 09:03 AM	#5
67sub Registered User Join Date: Aug 2003 Location: D/FW TX Posts: 430	A freind of mine has 15x12 welds on his 72, with 7.5 inch backspacing. The suspension is all stock and clears fine but you need to mini tub it or widen the wheelwell about three inches so you don't rub on the inside. __________________ 2004 Kawasaki KLR Always looking for a cheap driver

10-30-2003, 09:15 AM	#6
butter Registered User Join Date: Jan 2000 Location: Orange Beach, Alabama Posts: 133	More info anybody I am thinking about doing the same thing. __________________ 71 cheyenne 402 th400 swb 71 camper special (PARTS TRUCK) 70 Stepside swb 350

10-30-2003, 11:47 AM	#7
miket Registered User Join Date: Jan 2003 Location: Seattle WA Posts: 1,466	67: What size tire was your friend running on his truck? Can you get any pics? __________________ FocuzTech Performance Evergreen Protective Coatings Gatorhyde...the best kept secret in spray in bed lining & protection Last edited by miket; 10-30-2003 at 11:54 AM.

10-30-2003, 03:07 PM	#8
Adam12 I hate trannys Join Date: Dec 2001 Location: Bakersfield,CA Posts: 160	I would also like to know the tire size and see some pics of possable. Thanks adam __________________ 70 SWB 481 ci, TH-400, Edlebrok Victor Jr. intake, Holley street avenger 770, Dynomax ceramic coated headers. Dual flowmasters. and only 3516134 more little things to do.

10-30-2003, 04:33 PM	#9
67sub Registered User Join Date: Aug 2003 Location: D/FW TX Posts: 430	miket and adam12 - I'll try to get some info and pics tomorrow night. __________________ 2004 Kawasaki KLR Always looking for a cheap driver

10-30-2003, 04:36 PM	#10
miket Registered User Join Date: Jan 2003 Location: Seattle WA Posts: 1,466	Thanks 67 I really appreciate it. __________________ FocuzTech Performance Evergreen Protective Coatings Gatorhyde...the best kept secret in spray in bed lining & protection

11-09-2003, 02:51 PM	#11
miket Registered User Join Date: Jan 2003 Location: Seattle WA Posts: 1,466	67, Any success on pics? __________________ FocuzTech Performance Evergreen Protective Coatings Gatorhyde...the best kept secret in spray in bed lining & protection

11-10-2003, 12:32 AM	#12
butter Registered User Join Date: Jan 2000 Location: Orange Beach, Alabama Posts: 133	TTT __________________ 71 cheyenne 402 th400 swb 71 camper special (PARTS TRUCK) 70 Stepside swb 350

11-11-2003, 12:35 PM	#13
butter Registered User Join Date: Jan 2000 Location: Orange Beach, Alabama Posts: 133	TTT __________________ 71 cheyenne 402 th400 swb 71 camper special (PARTS TRUCK) 70 Stepside swb 350

01-27-2007, 11:54 PM	#14
Col Clank Registered User Join Date: Dec 2004 Location: Shreveport, LA Posts: 137	Re: 15x12 backspacing Ttt

01-28-2007, 01:32 PM	#15
1968SWBBigBlock Active Member Join Date: Oct 2006 Location: Ohio Posts: 1,643	Re: 15x12 backspacing Here are 2 shots of my truck 18.5" Mickey's The bed has been mini tubbed - the frame, shock location etc is all stock. The wheels are factory rally wheel with a spacer inserted into, just what you folks have been talking about. I like this since I can always take the truck back to "stock" is I wanted to and for know I get a ton of thumbs up Attached Images __________________ 1968 SWB 454 + .040, 490HP x 540 FT pounds of Torque 10-1 Kb Forged pistons, recon rods w/ ARP wave loc bolts 781 heads Ported with 2.19/1.88 SSTvalves Lunati 60204 cam, Micro Trol lifters, Ported Edelbrock Performer Rpm manifold armor coated, Pertronix Triple Strike Ignition Holley 770 Street Avenger carb,Headers armor coated Built by Watson Ruppel Performance in Sarahsville Ohio. Hardshift Tranny Built Turbo 350,TSI 10" 3000 stall 12 Bolt Eaton Posi 4.10 Richmond Gears moser axles 18.5" x 31" Hoosier Pro Street Radials ET Classic 5 Wheels - polished Power Steering, Power Brakes,Disc Brakes,Tach & Gauge Dash, Tilt,Factory Air (gone) Custom Paint & Body Work Special thanks to my wife, my son and my money tree



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