71 disc brake backspacing help - Chevelle Tech
Wheels & Tires What fits what?

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post #1 of 12 (permalink) Old Nov 8th, 19, 2:47 PM Thread Starter
 
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71 disc brake backspacing help

I know this topic has been beat to death but after searching I can't find the answer I'm looking for. My car is a 71 chevelle malibu that I am getting disc brakes put on right now. The kit is right stuff AFXSD41CX and it changes the offset by .25 on each side. I didn't realize that when I ordered a set of 15x7 4in and 15x8 4.25 cragar s/s rims from summit, they're going to let me return them but now Im in a time crunch to get something ordered and here anybody have any suggestions?? I don't care if its a 15,17,18 i just need it to fit without modifications to shock towers or fenders because at the point the car is stranded on jack stands. want to stay around 700-900 for rims
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post #2 of 12 (permalink) Old Nov 8th, 19, 2:56 PM
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Bart
 
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Re: 71 disc brake backspacing help

Are you wanting suggestion on wheels? If so, pretty much any wheel up to 9.5 width and 5.5 to 5.75 backspacing will fit fine.(5.5 probably the most popular option) I have 18x9.5 vision 143 wheels with 5.75 BS on my 72 with the same disc brake kit, 285/40/R18 nitto 555 tires and I have no issues at all.

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post #3 of 12 (permalink) Old Nov 8th, 19, 2:59 PM Thread Starter
 
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Re: 71 disc brake backspacing help

Im just wanting size and back spacing I need I am trying to get some ordered asap thanks for the suggestion I've seen so many suggestions from 4-6.75
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post #4 of 12 (permalink) Old Nov 8th, 19, 3:03 PM
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Bart
 
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Re: 71 disc brake backspacing help

Quote:
Originally Posted by Shown22865 View Post
Im just what size and back spacing I need I am trying to get some ordered asap thanks for the suggestion I've seen so many suggestions from 4-6.75
for the rear you will want between and 8.5-10 wide rim (my opinion), that will put you needing between 5.25 and 5.75 BS. no less, no more. stay between a 255R45-285r40 tire as well. Again this is just my opinion as I have no idea if you want an original look, pro touring look etc.. Way to many variables, but this will get you in the ballpark.

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post #5 of 12 (permalink) Old Nov 8th, 19, 3:12 PM Thread Starter
 
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Re: 71 disc brake backspacing help

Quote:
Originally Posted by Bart_Swisher View Post
for the rear you will want between and 8.5-10 wide rim (my opinion), that will put you needing between 5.25 and 5.75 BS. no less, no more. stay between a 255R45-285r40 tire as well. Again this is just my opinion as I have no idea if you want an original look, pro touring look etc.. Way to many variables, but this will get you in the ballpark.
I prefer the retro cragar s/s look 15 inch but they don't offer the backspacing I need in them so Im open to anything really I've had Weld prostars on a nova before and I thought they looked good
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post #6 of 12 (permalink) Old Nov 8th, 19, 3:15 PM Thread Starter
 
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Re: 71 disc brake backspacing help

On the front what should I use?
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post #7 of 12 (permalink) Old Nov 8th, 19, 3:30 PM
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Re: 71 disc brake backspacing help

Quote:
Originally Posted by Shown22865 View Post
On the front what should I use?
Again, it really depend on the look/stance you are after. Hopefully some of the other folks will chime in on suggestions with better input as far as the options comparable to the wheels you are wanting. My car is lowered, 4 wheel disc, etc with more of a pro touring feel. I think you are looking for something between stock and that. I have 18x8.5 with 4.5 BS on the front and really needed about 5.1 BS on the front because I am lowered about 3+ inches in the front. I am lowered 2" in the rear.

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post #8 of 12 (permalink) Old Nov 8th, 19, 4:17 PM
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Re: 71 disc brake backspacing help

Spotted this today on the local Houston area Craig's list. Add says these wheels are American Racing Salt Flats, 17". I think their a good lookin wheel. Don't know what the back spacing is??
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post #9 of 12 (permalink) Old Nov 8th, 19, 5:36 PM
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Re: 71 disc brake backspacing help

What are you having problems with exactly. Rims aren't clearing something like the brake calipers, or shocks. Do they stick out to far and hit the fender lip. On my 71 Malibu I have front factory discs with new Right Stuff calipers. I run a 15x4" rim in the front with a 2.25BS and in the rear with stock brake drums I run a 15x8" with a 5.5 BS with a 1/4" spacer. Everything fits and clears everything.
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71 Malibu, Cottonwood Green, 396 BBC, AutoGear M22W 4 speed, 12 bolt 3:55 posi.
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post #10 of 12 (permalink) Old Nov 8th, 19, 7:33 PM
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Re: 71 disc brake backspacing help

Quote:
Originally Posted by Shown22865 View Post
I prefer the retro cragar s/s look 15 inch but they don't offer the backspacing I need in them so Im open to anything really I've had Weld prostars on a nova before and I thought they looked good
Shown,
This is how you figure the correct backspacing :

The wheel needs to be centered in the wheelwell or 1/4" toward the inside.

An 8" rim is actually 9" wide. A 9" rim is 10" wide (because of the lip on each side).


Whatever the width is, add 1" and divide by 2 : that will give you the backspace that centers the wheel in the wheelwell.

So take an 8" wide wheel.
The correct backspace will be 8 + 1 divided by 2 = 4.5"
So 4.5" to 4.75" will be the ideal backspace on an 8" rim.

9" would be 5" to 5.25"
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post #11 of 12 (permalink) Old Nov 15th, 19, 9:17 PM Thread Starter
 
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Re: 71 disc brake backspacing help

Just to update the thread for anyone else using that right stuff kit and looking for wheels I went with Coker V45 part numbers COK-345-7861 and COK-345-7961 that's a 17x8 4.75bs on the front and 17x9 5.5bs on the rear> After measuring it I think 6inches of bs on a 15x10 would leave an inch and a quarter on each side on the wheel. Thanks for all the help!
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post #12 of 12 (permalink) Old Nov 15th, 19, 10:15 PM
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Re: 71 disc brake backspacing help

Quote:
Originally Posted by Shown22865 View Post
Just to update the thread for anyone else using that right stuff kit and looking for wheels I went with Coker V45 part numbers COK-345-7861 and COK-345-7961 that's a 17x8 4.75bs on the front and 17x9 5.5bs on the rear> After measuring it I think 6inches of bs on a 15x10 would leave an inch and a quarter on each side on the wheel. Thanks for all the help!

I've always liked those V45's

67 Chevelle convertible, 138 vin, original 4 speed, bucket seats, Marina Blue with black interior
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