Original tire size???? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

lux hauler · 04-26-2002, 05:00 PM

Does anyone know what the diameter was of the tires that were originally put on a '72 two wheel drive?
I want to keep my new tires as close to the original diameter as possible to keep the gearing and speedo correct.

Thanks

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72 LWB; 350/350,PS,PB,Posi,all original........for now.
99 Ranger

GOD BLESS THE U.S.A.!!!
http://communities.msn.com/196772ChevyTrucks
Vermilion, Ohio

*Fast68Chevy* · 04-26-2002, 05:17 PM

depends on the year actually,

standard on 70-72 half ton 2wd were G78-15,
before 70 was std tire size of 8.15-15,
this sizing changed to the alpha numeric sizing in 69 or 70 then went to the common metric sizing we have today starting in the early 80's
i stil have an original 1968 std equipment GoodYear polyester cord spare 8.15-25 tire on original wheel and all
date stamp code on the backside of the tire of of JUO552C if someone can decode that

roughly 28.3" is what was standard equipment on these trucks, you have to realize there were tens of tire and wheel size options each year, you could get 16" rims on half ton or tube tires, alot of different sizes and widths and types of tires, highway nylons, etc
http://www.tirerack.com/tires/tirete...conversion.htm

http://www.google.com/search?hl=en&q...ize+conversion
http://www.onlineconversion.com/tire...conversion.htm

------------------
Randy- Lincoln, IL

r68c30@hotmail.com 2177353230
-71 C-10 350/CH465/3.07, assemble it, yeah right, that'll happen in this world,(not)
-84 Z28 Camaro 5.0L 700R4, 3.73, beater, paid way too much for it like an idiot,,
-84 Firebird SE 2.8L T-5, rod knocking, dammit,,
-82 Firebird 350 4bolt (TBL)/TH350, not running, dammit...
buy/sell/hoard/trade most any GM vehicle parts of any kind
-parting out: '81 Cutlass Supreme Brougham
*Paint is overrated
© RSS Enterprises 2000

[This message has been edited by Fast68Chevy (edited April 26, 2002).]

lux hauler · 04-26-2002, 05:38 PM

ok....glovebox sticker says that the original tire size was H78-15.
It's a '72 LWB 2wd half ton.
Thanks for the links but I couldn't find anything on a "H" series tire.

I would think that a 28.9"(255/70SR15) front and a 30.8"(285/70SR15) rear should work pretty well....? I'm gunna be putting them on 15x7 truck rallys. Those are the widest that I could find to fit on that wheel and still stay close to the stock diameter.

[This message has been edited by 1972c10_ohio (edited April 26, 2002).]

04-26-2002, 05:00 PM	#1
lux hauler Psycho-billy Member Join Date: Jul 2001 Location: about 40 miles west of Cleveland, Ohio Posts: 2,591	Original tire size???? Does anyone know what the diameter was of the tires that were originally put on a '72 two wheel drive? I want to keep my new tires as close to the original diameter as possible to keep the gearing and speedo correct. Thanks ------------------ 72 LWB; 350/350,PS,PB,Posi,all original........for now. 99 Ranger GOD BLESS THE U.S.A.!!! http://communities.msn.com/196772ChevyTrucks Vermilion, Ohio __________________ '72 C-10 350 w/Lunati Voodoo cam (207/213, .437/.454), Performer intake, 625 Road Demon Jr. and Hooker headers. Support your community, support yourself. Buy local, buy American (or Canadian).

04-26-2002, 05:38 PM	#3
lux hauler Psycho-billy Member Join Date: Jul 2001 Location: about 40 miles west of Cleveland, Ohio Posts: 2,591	ok....glovebox sticker says that the original tire size was H78-15. It's a '72 LWB 2wd half ton. Thanks for the links but I couldn't find anything on a "H" series tire. I would think that a 28.9"(255/70SR15) front and a 30.8"(285/70SR15) rear should work pretty well....? I'm gunna be putting them on 15x7 truck rallys. Those are the widest that I could find to fit on that wheel and still stay close to the stock diameter. [This message has been edited by 1972c10_ohio (edited April 26, 2002).] __________________ '72 C-10 350 w/Lunati Voodoo cam (207/213, .437/.454), Performer intake, 625 Road Demon Jr. and Hooker headers. Support your community, support yourself. Buy local, buy American (or Canadian).

04-26-2002, 05:17 PM	#2
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	depends on the year actually, standard on 70-72 half ton 2wd were G78-15, before 70 was std tire size of 8.15-15, this sizing changed to the alpha numeric sizing in 69 or 70 then went to the common metric sizing we have today starting in the early 80's i stil have an original 1968 std equipment GoodYear polyester cord spare 8.15-25 tire on original wheel and all date stamp code on the backside of the tire of of JUO552C if someone can decode that roughly 28.3" is what was standard equipment on these trucks, you have to realize there were tens of tire and wheel size options each year, you could get 16" rims on half ton or tube tires, alot of different sizes and widths and types of tires, highway nylons, etc http://www.tirerack.com/tires/tirete...conversion.htm http://www.google.com/search?hl=en&q...ize+conversion http://www.onlineconversion.com/tire...conversion.htm ------------------ Randy- Lincoln, IL r68c30@hotmail.com 2177353230 -71 C-10 350/CH465/3.07, assemble it, yeah right, that'll happen in this world,(not) -84 Z28 Camaro 5.0L 700R4, 3.73, beater, paid way too much for it like an idiot,, -84 Firebird SE 2.8L T-5, rod knocking, dammit,, -82 Firebird 350 4bolt (TBL)/TH350, not running, dammit... buy/sell/hoard/trade most any GM vehicle parts of any kind -parting out: '81 Cutlass Supreme Brougham *Paint is overrated © RSS Enterprises 2000 [This message has been edited by Fast68Chevy (edited April 26, 2002).]



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