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1960 Desoto Wheel Backspacing
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Mope R. Geezer
Posted 2021-02-04 12:44 PM (#608528)
Subject: 1960 Desoto Wheel Backspacing



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My 1960 Desoto Fireflite currently has 15" steel wheels with 3.75 backspacing.  The 15" wheels were used to facilitate front disc brake conversion which combines '76 Dodge Dart and '76 Chevy Monte Carlo parts from AAJ Brakes.  I'm wanting to buy Wheel Vintique 76 Series Chrysler wire wheels for it, which have 3.625 backspacing - 1/8" difference.  Neither Wheel Vintiques or my local tire shop can tell me whether the wires are likely to have sufficient clearance.  I don't want to order them until I know for sure they will fit.  I've seen many Dodges, Desotos, Chryslers with these wheels and disc brakes.  What say you?

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Powerflite
Posted 2021-02-04 4:12 PM (#608532 - in reply to #608528)
Subject: Re: 1960 Desoto Wheel Backspacing



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You're not giving enough information. We need the wheel width too. But assuming that the width is 6.5", you should be fine. The new wheel pushes the tire further outward, but there is typically plenty of space out there before your tire will hit your fender. I am running 255x60x15 tires on 8" rims with 4.5" backspace on the front of my '58 Dodge without clearance issues.
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Mope R. Geezer
Posted 2021-02-04 4:50 PM (#608533 - in reply to #608528)
Subject: RE: 1960 Desoto Wheel Backspacing



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Location: Idaho - where men are men and spuds are spuds

They are 15x6.  Hmmmmm, I was thinking that 1/8" less would bring the wheel/tire inwards.

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1960fury
Posted 2021-02-04 6:49 PM (#608539 - in reply to #608528)
Subject: Re: 1960 Desoto Wheel Backspacing



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Backspacing is not important and changes with wheel design. For suspension geometry you need to know offset, which is +1/2" stock.
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57burb
Posted 2021-02-05 1:29 PM (#608555 - in reply to #608528)
Subject: RE: 1960 Desoto Wheel Backspacing



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Mope R. Geezer - 2021-02-04 11:44 AM

My 1960 Desoto Fireflite currently has 15" steel wheels with 3.75 backspacing.  The 15" wheels were used to facilitate front disc brake conversion which combines '76 Dodge Dart and '76 Chevy Monte Carlo parts from AAJ Brakes.  I'm wanting to buy Wheel Vintique 76 Series Chrysler wire wheels for it, which have 3.625 backspacing - 1/8" difference.  Neither Wheel Vintiques or my local tire shop can tell me whether the wires are likely to have sufficient clearance.  I don't want to order them until I know for sure they will fit.  I've seen many Dodges, Desotos, Chryslers with these wheels and disc brakes.  What say you?



Mope R. Geezer - 2021-02-04 3:50 PM

They are 15x6.  Hmmmmm, I was thinking that 1/8" less would bring the wheel/tire inwards.


Nope, going from 3.75" backspacing to 3.625" backspacing will push the wheels further out - assuming the wheel width is the same.

Backspacing is the measurement from wheel mounting flange to the outside edge of the rim ----->on the backside.

If this distance is 1/8" less, then a wheel of the same width will effectively be positioned 1/8" further outboard. But keep in mind that the amount a given wheel protrudes outward from the wheel mounting flange is "overall wheel width minus backspacing." And if that's not confusing enough, wheel width and overall wheel width are not the same.

I think this graphic will help explain. And to give you a direct answer to your question, I am 99% sure the aftermarket wire wheels work fine with AAJ brakes. Mine did.

Edited by 57burb 2021-02-05 1:30 PM




(R5b9f00aef89195f6b5ddedbec02aae18.gif)



Attachments
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Attachments R5b9f00aef89195f6b5ddedbec02aae18.gif (127KB - 195 downloads)
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57burb
Posted 2021-02-05 1:31 PM (#608556 - in reply to #608555)
Subject: RE: 1960 Desoto Wheel Backspacing



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Unrelated, are you related to carjock? I haven't heard from him in ages.
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Mope R. Geezer
Posted 2021-02-05 2:39 PM (#608557 - in reply to #608528)
Subject: RE: 1960 Desoto Wheel Backspacing



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Yes, 57burb, that explains it very well.  I wasn't so much worried about fender clearance as I was about clearing the disc brake assembly.  Thanks.

And yes, unfortunately I have to admit carjock is my brother.  He's completely out of the "car" hobby now, and has switched to guitars.  I don't know how many he has, but I know he has become quite accomplished at buying guitars for little or nothing, refurbishing them and then selling the ones he doesn't want to keep.  This is good, because when he was doing cars, he would buy high and sell low.  :)

 

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56D500boy
Posted 2021-02-05 9:15 PM (#608564 - in reply to #608555)
Subject: RE: 1960 Desoto Wheel Backspacing



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57burb - 2021-02-05 10:29 AM ..
And if that's not confusing enough, wheel width and overall wheel width are not the same.


Here is a real world example of that. 56 Dodge D500 (and 56 Fury)(aka 56 Chrysler Windsor) wheels. Nominal 5 1/2" width. That is bead to bead. Overall width is 6 1/2".



Edited by 56D500boy 2021-02-05 9:17 PM




(56DodgeD500WheelSizeStamp.jpg)



(56DodgeD500WheelSizeStamp_2.jpg)



(56DodgeD500slashWindsorWheels_BeadToBead.jpg)



(56DodgeD500slashWindsorWheels_OuterLipToOuterLip.jpg)



Attachments
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Attachments 56DodgeD500WheelSizeStamp.jpg (180KB - 198 downloads)
Attachments 56DodgeD500WheelSizeStamp_2.jpg (190KB - 200 downloads)
Attachments 56DodgeD500slashWindsorWheels_BeadToBead.jpg (194KB - 195 downloads)
Attachments 56DodgeD500slashWindsorWheels_OuterLipToOuterLip.jpg (195KB - 200 downloads)
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