Rim and tire - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Merl's chevy · 01-09-2014, 04:59 PM

I have a 1968 chevy c10 with a 3" , 5" drop. I was wondering what does my back space need to be on my wheels if the are 8.5 wide. I want to put on 20" wheels. Im not sure on tires yet

CC69Rat · 01-09-2014, 10:39 PM

Do you know if you still have the original rear end housing in your truck? 67-68 housings are shorter than 69 (late build) thru 72 model year.

20x8.5 up front with 5.25" Backspace will fit nicely

The rear depends on which housing you have... (I can tell you how to check if you need to know)

Welcome to the board from TN

Merl's chevy · 01-10-2014, 10:10 AM

Thanks thats awesome. It is an original 68 rear end

CC69Rat · 01-10-2014, 11:19 AM

To be 100% sure (wheels are expensive) lay underneath the truck. Have a buddy hold one end of the tape measure on the inside edge of the brake baking plate. Then measure to the same location on the other side of the rear housing. 55.5" for the 67-68 rear housing, 57" for the 69 (late) 70 + housing. I have seen both in 69-70 trucks. 70 was the transition year. When discs were introduced in 71 the front track width changed so they had to adjust the width of the rear axle housing too. The later rear housings are .75" wider on either side. So if you have the late rear end it can mean the wheels fitting, or not fitting.

late housing - 20x10 5.5" Backspace. 295/40/20 tire
early housing - 20x10 5" Backspace. 295/40/20 tire
front - 20x8.5 5.25" Backspace 255/40/20 tire ( 45 series works too, it just depends on how much tire you want on it )

I ran 295/45/20 on a 20x10 with 5.75" Backspace on a late housing with 7.25" static drop but it was REALLY tight. Stock bed fenders, wood floor.

Hope this helps.

**LockDoc** · 01-10-2014, 02:04 PM

-
Flip...

LockDoc

long'n low · 01-10-2014, 06:44 PM

I have the riddler 695's
20x8.5 0 offset 255/40r20
20x10 0 offset 295/40r20
with the narrow rear end
Could have a little more bs on the front if I go any lower than 3" but it's good with 3/5 drop.

**70cst** · 01-10-2014, 08:36 PM

Hey Merl's chevy ...

to the forums and

from Ohio...

Merl's chevy · 04-08-2014, 02:27 AM

Hello everyone! Has anyone ran 265 50 20 with a 3" 5" drop on 1968

01-09-2014, 04:59 PM	#1
Merl's chevy Registered User Join Date: Sep 2012 Location: Sacramento California Posts: 8	Rim and tire I have a 1968 chevy c10 with a 3" , 5" drop. I was wondering what does my back space need to be on my wheels if the are 8.5 wide. I want to put on 20" wheels. Im not sure on tires yet Attached Images

01-09-2014, 10:39 PM	#2
CC69Rat Registered User Join Date: Jan 2011 Location: Chattanooga TN Posts: 6,212	Re: Rim and tire Do you know if you still have the original rear end housing in your truck? 67-68 housings are shorter than 69 (late build) thru 72 model year. 20x8.5 up front with 5.25" Backspace will fit nicely The rear depends on which housing you have... (I can tell you how to check if you need to know) Welcome to the board from TN __________________ Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 Currently underway 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet Sold 1985 Silverado Short Fleet Sold 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride)

01-10-2014, 10:10 AM	#3
Merl's chevy Registered User Join Date: Sep 2012 Location: Sacramento California Posts: 8	Re: Rim and tire Thanks thats awesome. It is an original 68 rear end

01-10-2014, 11:19 AM	#4
CC69Rat Registered User Join Date: Jan 2011 Location: Chattanooga TN Posts: 6,212	Re: Rim and tire To be 100% sure (wheels are expensive) lay underneath the truck. Have a buddy hold one end of the tape measure on the inside edge of the brake baking plate. Then measure to the same location on the other side of the rear housing. 55.5" for the 67-68 rear housing, 57" for the 69 (late) 70 + housing. I have seen both in 69-70 trucks. 70 was the transition year. When discs were introduced in 71 the front track width changed so they had to adjust the width of the rear axle housing too. The later rear housings are .75" wider on either side. So if you have the late rear end it can mean the wheels fitting, or not fitting. late housing - 20x10 5.5" Backspace. 295/40/20 tire early housing - 20x10 5" Backspace. 295/40/20 tire front - 20x8.5 5.25" Backspace 255/40/20 tire ( 45 series works too, it just depends on how much tire you want on it ) I ran 295/45/20 on a 20x10 with 5.75" Backspace on a late housing with 7.25" static drop but it was REALLY tight. Stock bed fenders, wood floor. Hope this helps. __________________ Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 Currently underway 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet Sold 1985 Silverado Short Fleet Sold 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride)

01-10-2014, 02:04 PM	#5
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,772	Re: Rim and tire - Flip... LockDoc Attached Images __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

01-10-2014, 06:44 PM	#6
long'n low Registered User Join Date: Oct 2013 Location: Kelowna BC Posts: 51	Re: Rim and tire I have the riddler 695's 20x8.5 0 offset 255/40r20 20x10 0 offset 295/40r20 with the narrow rear end Could have a little more bs on the front if I go any lower than 3" but it's good with 3/5 drop. Attached Images

01-10-2014, 08:36 PM	#7
70cst Senior Member Join Date: Feb 2001 Location: New Madison, Ohio Posts: 21,373	Re: Rim and tire Hey Merl's chevy ... to the forums and from Ohio... __________________ A husband can be right...or...A husband can be happy. 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder!

04-08-2014, 02:27 AM	#8
Merl's chevy Registered User Join Date: Sep 2012 Location: Sacramento California Posts: 8	Re: Rim and tire Hello everyone! Has anyone ran 265 50 20 with a 3" 5" drop on 1968

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