Back spacing help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

heathbirkendahl · 08-11-2012, 05:01 PM

I'm trying to order wheels and need to know the front and rear back spacing.

Front - 17x8 or 8.5
Rear - 17x9.5

Help a newbie out! Thank you!

1971 short bed w/4-6 drop. (Early Classics kit)
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**CC69Rat** · 08-11-2012, 08:34 PM

Fleetside or stepside? Have you measured the rear axle housing to be sure it's the later (71-72) housing ? I'd say it probably is .. but I would want to be sure.

heathbirkendahl · 08-12-2012, 02:40 PM

Fleet side with the stock rear end.

**CC69Rat** · 08-12-2012, 07:25 PM

Most of the trucks running 20s go with an 8.5" wheel up front with a 5.25 in backspacing. I would think it would be the same for 17s..(?) On the back a 20x10 with 5.5" backspacing. This assumes your stock rear housing is a 71-72 (wider one)

So for your wheels:

17x8 - Id do 4.75" bs
17x8.5 - 5.25 bs

On the rear

17x9.5 - 5" bs
17x10 - 5.5" bs

This is all my opinion, and just trying to help. These measurements are just a target and depending on tire sizes you choose it might work and might not.
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heathbirkendahl · 08-12-2012, 08:20 PM

Thank you CC69Rat!!

Anyone disagree or have any other suggestions? You only get one shot at ordering wheels and then your kinds stuck with them.

Best,

**CC69Rat** · 08-12-2012, 08:34 PM

Id suggest buying a Percy's wheelrite. Summit racing sells them. That way you can measure to be certain to get what you want
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heathbirkendahl · 08-12-2012, 09:50 PM

I'm trying to find a wheel over the counter without going custom. (If possible) That is a great idea though.

heathbirkendahl · 08-13-2012, 06:23 PM

Can anyone hook my up with some pics with 18's and 20's??

heathbirkendahl · 08-16-2012, 12:30 AM

Please post your 18 inch back spacing and any pics.

Thank you very much! I need your help.
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**70cst** · 08-16-2012, 12:38 AM

BS 101...this might help

Measuring For Wheels Video,...

http://67-72chevytrucks.com/vboard/s...52#post5451652

heathbirkendahl · 08-16-2012, 12:47 AM

Thank you..... I just figured someone has done this before and would know what back spacing they purchased. I'm looking at the Boss 338 which is very popular.
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08-11-2012, 05:01 PM	#1
heathbirkendahl Registered User Join Date: Jul 2012 Location: Campbell, CA Posts: 452	Back spacing help I'm trying to order wheels and need to know the front and rear back spacing. Front - 17x8 or 8.5 Rear - 17x9.5 Help a newbie out! Thank you! 1971 short bed w/4-6 drop. (Early Classics kit) Posted via Mobile Device __________________ 1971 C/10 - Orange & White 2009 GMC 1500 - Lowered 3/4 22' KMC Slides

08-11-2012, 08:34 PM	#2
CC69Rat Senior Member Join Date: Jan 2011 Location: Chattanooga TN Posts: 6,207	Re: Back spacing help Fleetside or stepside? Have you measured the rear axle housing to be sure it's the later (71-72) housing ? I'd say it probably is .. but I would want to be sure. __________________ 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)

08-12-2012, 02:40 PM	#3
heathbirkendahl Registered User Join Date: Jul 2012 Location: Campbell, CA Posts: 452	Re: Back spacing help Fleet side with the stock rear end. Attached Images __________________ 1971 C/10 - Orange & White 2009 GMC 1500 - Lowered 3/4 22' KMC Slides

08-12-2012, 07:25 PM	#4
CC69Rat Senior Member Join Date: Jan 2011 Location: Chattanooga TN Posts: 6,207	Re: Back spacing help Most of the trucks running 20s go with an 8.5" wheel up front with a 5.25 in backspacing. I would think it would be the same for 17s..(?) On the back a 20x10 with 5.5" backspacing. This assumes your stock rear housing is a 71-72 (wider one) So for your wheels: 17x8 - Id do 4.75" bs 17x8.5 - 5.25 bs On the rear 17x9.5 - 5" bs 17x10 - 5.5" bs This is all my opinion, and just trying to help. These measurements are just a target and depending on tire sizes you choose it might work and might not. Posted via Mobile Device __________________ 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)

08-12-2012, 08:20 PM	#5
heathbirkendahl Registered User Join Date: Jul 2012 Location: Campbell, CA Posts: 452	Re: Back spacing help Thank you CC69Rat!! Anyone disagree or have any other suggestions? You only get one shot at ordering wheels and then your kinds stuck with them. Best, __________________ 1971 C/10 - Orange & White 2009 GMC 1500 - Lowered 3/4 22' KMC Slides

08-12-2012, 08:34 PM	#6
CC69Rat Senior Member Join Date: Jan 2011 Location: Chattanooga TN Posts: 6,207	Re: Back spacing help Id suggest buying a Percy's wheelrite. Summit racing sells them. That way you can measure to be certain to get what you want Posted via Mobile Device __________________ 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)

08-12-2012, 09:50 PM	#7
heathbirkendahl Registered User Join Date: Jul 2012 Location: Campbell, CA Posts: 452	Re: Back spacing help I'm trying to find a wheel over the counter without going custom. (If possible) That is a great idea though. __________________ 1971 C/10 - Orange & White 2009 GMC 1500 - Lowered 3/4 22' KMC Slides

08-13-2012, 06:23 PM	#8
heathbirkendahl Registered User Join Date: Jul 2012 Location: Campbell, CA Posts: 452	Re: Back spacing help Can anyone hook my up with some pics with 18's and 20's?? __________________ 1971 C/10 - Orange & White 2009 GMC 1500 - Lowered 3/4 22' KMC Slides

08-16-2012, 12:30 AM	#9
heathbirkendahl Registered User Join Date: Jul 2012 Location: Campbell, CA Posts: 452	Re: Back spacing help Please post your 18 inch back spacing and any pics. Thank you very much! I need your help. Posted via Mobile Device __________________ 1971 C/10 - Orange & White 2009 GMC 1500 - Lowered 3/4 22' KMC Slides

08-16-2012, 12:38 AM	#10
70cst Senior Member Join Date: Feb 2001 Location: New Madison, Ohio Posts: 21,365	Re: Back spacing help BS 101...this might help Measuring For Wheels Video,... http://67-72chevytrucks.com/vboard/s...52#post5451652 __________________ 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!

08-16-2012, 12:47 AM	#11
heathbirkendahl Registered User Join Date: Jul 2012 Location: Campbell, CA Posts: 452	Re: Back spacing help Thank you..... I just figured someone has done this before and would know what back spacing they purchased. I'm looking at the Boss 338 which is very popular. Posted via Mobile Device __________________ 1971 C/10 - Orange & White 2009 GMC 1500 - Lowered 3/4 22' KMC Slides



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