Wheel/tire size - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**seafoam68** · 10-30-2019, 09:20 PM

Hey guys. Getting ready to order front wheels and tires. Anyone know factory sizes, backspaces? Or what you are running? Truck is a big block and lowered 4.5 inches in front.

siggyfreud · 10-31-2019, 08:25 PM

You looking for factory sized wheels, or just as a reference point and going with something else?

**3757chevy** · 11-01-2019, 12:16 AM

big block truck ?

**3757chevy** · 11-01-2019, 12:17 AM

I run a 245/60-15 on a 15x8 with 4 1/4" backspace.

Rufas · 11-01-2019, 01:51 AM

I'm running 275/45-20s. If I remember, standard backspacing. Two inch drop spindles, flipped axle - notched frame, bagged on all corners. As it sit about a 7 inch drop.

Ekliptix · 11-01-2019, 12:50 PM

I have a big block and am also lowered 4.5" in the front. I'm on factory 5x15" rims. Tires are this:

weq92f · 11-01-2019, 01:04 PM

Quote:

Originally Posted by Ekliptix

I have a big block and am also lowered 4.5" in the front. I'm on factory 5x15" rims. Tires are this:

Hey...you didn't 'light paint' that wheel picture!

jk

-klb

**seafoam68** · 11-12-2019, 07:37 PM

Hey guys, thanks for the replies. I should have noted I'm planning on running Weld draglites. I just didn't know what size to order. I'm thinking about a 6" width or so but didn't know the backspace.

Mike C · 11-13-2019, 08:45 AM

3.5” backspacing is zero offset on a 6” wide rim and zero offset is a good place to start on these trucks IMO.

I have 17x8 on the front with 4.5” backspace (also zero offset) and 235 55 17.

Rear of my truck is a 17x9 with 5” backspace (once again, zero offset) and 275 55 17.

An 8” wide rim measures 8” BETWEEN beads. Overall outside to outside will be right a 9”. Measured from wheel mounting surface to outside of the inside of the wheel is backspacing. Zero offset means the WMS is right in the middle of the wheel and that is 4.5” on an 8” rim.

Based on weight of the truck, width of the truck, size of the wheel well, IMO a 17” or 18” wheel would be a better choice. I would also get away from 15” rims as the choice of tire sizes and load ratings just isn’t what it once was. The 17” wheels on my short bed is the best mod I’ve done.

**Speedracer39** · 11-13-2019, 11:06 AM

72 c10 big block flip kit and drop spindles with 1 inch big block drop springs 295/40/20 on rear and 245/40/20 on front

10-30-2019, 09:20 PM	#1
seafoam68 Senior Member Join Date: Oct 2009 Location: Chattanooga, TN Posts: 259	Wheel/tire size Hey guys. Getting ready to order front wheels and tires. Anyone know factory sizes, backspaces? Or what you are running? Truck is a big block and lowered 4.5 inches in front.

10-31-2019, 08:25 PM	#2
siggyfreud Registered User Join Date: Jun 2012 Location: Portland Posts: 1,330	Re: Wheel/tire size You looking for factory sized wheels, or just as a reference point and going with something else? __________________ Current Build - Project "Ghost of Poseidon" 72 C10 Pro-touring build Previous Build - 66 GMC Pro-touring build. Sold.

11-01-2019, 12:16 AM	#3
3757chevy Senior Member Join Date: Mar 2016 Location: Near Canon City ,Colorado Posts: 4,060	Re: Wheel/tire size big block truck ? __________________ '35 1/2 ton Pickup (bought 2020) '68 C10 Suburban (bought 2021) '72 K5 Blazer (bought 2013) '67 Stepside (bought 1997-sold 2021) '96 Bronco Eddie Bauer (inherited 2010) My 1st day here-'67 C10(sold)and '72 K5 Blazer http://67-72chevytrucks.com/vboard/s...d.php?t=702056 "Another Blue Chevy"(1935) http://67-72chevytrucks.com/vboard/s...d.php?t=799203 '68 Burb...https://67-72chevytrucks.com/vboard/...d.php?t=822994 MIKE

11-01-2019, 12:17 AM	#4
3757chevy Senior Member Join Date: Mar 2016 Location: Near Canon City ,Colorado Posts: 4,060	Re: Wheel/tire size I run a 245/60-15 on a 15x8 with 4 1/4" backspace. __________________ '35 1/2 ton Pickup (bought 2020) '68 C10 Suburban (bought 2021) '72 K5 Blazer (bought 2013) '67 Stepside (bought 1997-sold 2021) '96 Bronco Eddie Bauer (inherited 2010) My 1st day here-'67 C10(sold)and '72 K5 Blazer http://67-72chevytrucks.com/vboard/s...d.php?t=702056 "Another Blue Chevy"(1935) http://67-72chevytrucks.com/vboard/s...d.php?t=799203 '68 Burb...https://67-72chevytrucks.com/vboard/...d.php?t=822994 MIKE

11-01-2019, 01:51 AM	#5
Rufas Registered User Join Date: May 2016 Location: Fort Mohave, AZ Posts: 369	Re: Wheel/tire size I'm running 275/45-20s. If I remember, standard backspacing. Two inch drop spindles, flipped axle - notched frame, bagged on all corners. As it sit about a 7 inch drop. __________________ 1970 GMC 2500 700R Trans, RideTech 4 link rear suspension, air bagged on all four corners, factory upper/lower A-Arms, 2 inch drop spindles. 350 SBC 300hp Weiand Supercharger FiTech 30004 EFI

11-01-2019, 12:50 PM	#6
Ekliptix Registered User Join Date: Aug 2013 Location: Calgary, Alberta Posts: 683	Re: Wheel/tire size I have a big block and am also lowered 4.5" in the front. I'm on factory 5x15" rims. Tires are this:

11-12-2019, 07:37 PM	#8
seafoam68 Senior Member Join Date: Oct 2009 Location: Chattanooga, TN Posts: 259	Re: Wheel/tire size Hey guys, thanks for the replies. I should have noted I'm planning on running Weld draglites. I just didn't know what size to order. I'm thinking about a 6" width or so but didn't know the backspace.

11-13-2019, 08:45 AM	#9
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,727	Re: Wheel/tire size 3.5” backspacing is zero offset on a 6” wide rim and zero offset is a good place to start on these trucks IMO. I have 17x8 on the front with 4.5” backspace (also zero offset) and 235 55 17. Rear of my truck is a 17x9 with 5” backspace (once again, zero offset) and 275 55 17. An 8” wide rim measures 8” BETWEEN beads. Overall outside to outside will be right a 9”. Measured from wheel mounting surface to outside of the inside of the wheel is backspacing. Zero offset means the WMS is right in the middle of the wheel and that is 4.5” on an 8” rim. Based on weight of the truck, width of the truck, size of the wheel well, IMO a 17” or 18” wheel would be a better choice. I would also get away from 15” rims as the choice of tire sizes and load ratings just isn’t what it once was. The 17” wheels on my short bed is the best mod I’ve done. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

11-13-2019, 11:06 AM	#10
Speedracer39 Senior Member Join Date: Sep 2016 Location: Omaha Nebraska Posts: 596	Re: Wheel/tire size 72 c10 big block flip kit and drop spindles with 1 inch big block drop springs 295/40/20 on rear and 245/40/20 on front Attached Images



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