The dreaded backspace question.. But different - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jcblue · 11-20-2015, 12:23 AM

I have read through all the searches I could and found a lot of useful info.. What j didn't didn't find were pics from the back end to show the wheels position in relation to the fender or bedside, and I would also like to see some from underneath to see how close the wheel is to the wheel tub .. I have a 72 dropped 5/7 and from reading on here that with the wide rear I need a 5.5 backspace on a 20x10 and a 5.25 on a 20x8.5. I want to run 255/40 and 295/40 tires.. Will I be able to get .25 less backspace with that wide of tire in the rear? I read that a 5.25 backspace would work buy the truck owner ran a 275/35 tire.. Would really like to see some pics of the above stated..

jcblue · 11-20-2015, 09:30 AM

Some picsof my rally's.

jcblue · 11-20-2015, 09:32 AM

Under side

jcblue · 11-20-2015, 09:33 AM

My rear tires are currently a 275/60/15

jcblue · 11-20-2015, 07:42 PM

Ttt

jcblue · 11-21-2015, 09:01 AM

Anyone

**lolife99** · 11-21-2015, 11:16 AM

Why not get out a tape measure and measure back 5.5" from the face of the brake drum?
This will tell you exactly where the wheel will be.

Just remember,... Wheels advertised width is measured from the bead surface.
Wheels outside to outside measurement is approximately 1" wider.
So for your 20 X 10 allow 11" for the wheel width.

Measure both sides of the truck, because there might be some slight differences.
Also remove the wheels with the trucks weight resting on jack stands to duplicate ride height, not with the wheels hanging.

**lolife99** · 11-21-2015, 11:20 AM

This is a good thread,...
http://67-72chevytrucks.com/vboard/s...d.php?t=674909

ak808 · 11-21-2015, 04:30 PM

Quote:

Originally Posted by lolife99

This is a good thread,...
http://67-72chevytrucks.com/vboard/s...d.php?t=674909

That is an EXCELLENT thread, tried to subscribe to it for later reference, but the forum wont allow it... Worth a read for anyone looking at new shoes for the truck!

jcblue · 11-21-2015, 09:25 PM

I did some measuring today with two old steel rally's and my rear was about 1/2 off center. I feel a little better about my wheel backspace choice now but worried a little about tire size..

**lolife99** · 11-21-2015, 09:37 PM

An adjustable track bar will re-center the rearend.

11-20-2015, 12:23 AM	#1
jcblue Registered User Join Date: Aug 2007 Location: Elkton, ky Posts: 385	The dreaded backspace question.. But different I have read through all the searches I could and found a lot of useful info.. What j didn't didn't find were pics from the back end to show the wheels position in relation to the fender or bedside, and I would also like to see some from underneath to see how close the wheel is to the wheel tub .. I have a 72 dropped 5/7 and from reading on here that with the wide rear I need a 5.5 backspace on a 20x10 and a 5.25 on a 20x8.5. I want to run 255/40 and 295/40 tires.. Will I be able to get .25 less backspace with that wide of tire in the rear? I read that a 5.25 backspace would work buy the truck owner ran a 275/35 tire.. Would really like to see some pics of the above stated..

11-20-2015, 09:30 AM	#2
jcblue Registered User Join Date: Aug 2007 Location: Elkton, ky Posts: 385	Re: The dreaded backspace question.. But different Some picsof my rally's. Attached Images

11-20-2015, 09:32 AM	#3
jcblue Registered User Join Date: Aug 2007 Location: Elkton, ky Posts: 385	Re: The dreaded backspace question.. But different Under side Attached Images

11-20-2015, 09:33 AM	#4
jcblue Registered User Join Date: Aug 2007 Location: Elkton, ky Posts: 385	Re: The dreaded backspace question.. But different My rear tires are currently a 275/60/15

11-20-2015, 07:42 PM	#5
jcblue Registered User Join Date: Aug 2007 Location: Elkton, ky Posts: 385	Re: The dreaded backspace question.. But different Ttt

11-21-2015, 09:01 AM	#6
jcblue Registered User Join Date: Aug 2007 Location: Elkton, ky Posts: 385	Re: The dreaded backspace question.. But different Anyone

11-21-2015, 11:16 AM	#7
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,701	Re: The dreaded backspace question.. But different Why not get out a tape measure and measure back 5.5" from the face of the brake drum? This will tell you exactly where the wheel will be. Just remember,... Wheels advertised width is measured from the bead surface. Wheels outside to outside measurement is approximately 1" wider. So for your 20 X 10 allow 11" for the wheel width. Measure both sides of the truck, because there might be some slight differences. Also remove the wheels with the trucks weight resting on jack stands to duplicate ride height, not with the wheels hanging. __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 Last edited by lolife99; 11-21-2015 at 11:22 AM.

11-21-2015, 11:20 AM	#8
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,701	Re: The dreaded backspace question.. But different This is a good thread,... http://67-72chevytrucks.com/vboard/s...d.php?t=674909 __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

11-21-2015, 09:25 PM	#10
jcblue Registered User Join Date: Aug 2007 Location: Elkton, ky Posts: 385	Re: The dreaded backspace question.. But different I did some measuring today with two old steel rally's and my rear was about 1/2 off center. I feel a little better about my wheel backspace choice now but worried a little about tire size..

11-21-2015, 09:37 PM	#11
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,701	Re: The dreaded backspace question.. But different An adjustable track bar will re-center the rearend. __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823



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