Re: Wheel backspacing questions
[Re: 6PAX]
#2869603
01/06/21 09:43 AM
01/06/21 09:43 AM
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Joined: Jan 2003
Posts: 12,256 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,256
Benton, IL.
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I am not sure that I understand exactly what you are asking. But, the maximum backspace is the same no matter the wheel width. The hub to whatever first interferes with the wheel and tire dictates the maximum backspace. That is why we often use offset spring hangers. To allow more backspacing and thereby get more wheel and tire width because the spring is usually the first thing that limits inside wheel well width.
If you are asking how to determine what your particular maximum back space is, use a piece of cardboard. Jack a rear corner of the car up, slide a piece of cardboard under it, let the car down so that the tire marks the cardboard. Jack it back up and remove that wheel. Now take a plumb bob and trace the inside limits of the wheel well along with the hub onto the cardboard. Very simple and very accurate. Be sure to do both sides because they will vary.
Did that answer your question?
Master, again and still
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Re: Wheel backspacing questions
[Re: 6PAX]
#2869660
01/06/21 12:20 PM
01/06/21 12:20 PM
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Joined: Mar 2007
Posts: 3,287 West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,287
West Coast, USA
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What I would like to know is if there is a limit to how much backspacing a wheel can have from a safety point of view regarding the structure of the wheel. For example, I have a 10" wide wheel with 5" of BS. How much more BS could that same 10" wheel have and still be structurally sound/safe? 6", 7", 8" ? I hope this makes sense. Wheel manufacturers will not sell a wheel that is compromised with an attempt at building a wheel with too much backspacing. In other words, you will not be able to order one that exceeds the safety threshold.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: Wheel backspacing questions
[Re: jbc426]
#2869700
01/06/21 01:59 PM
01/06/21 01:59 PM
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Joined: Jan 2003
Posts: 5,655 Detroit area
6PAX
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,655
Detroit area
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Wheel manufacturers will not sell a wheel that is compromised with an attempt at building a wheel with too much backspacing. In other words, you will not be able to order one that exceeds the safety threshold. This is what I was getting at. What is the safety threshold?
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Re: Wheel backspacing questions
[Re: 6PAX]
#2870020
01/06/21 07:24 PM
01/06/21 07:24 PM
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Joined: Jan 2003
Posts: 8,405 Highland, MI.
Sunroofcuda
master
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master
Joined: Jan 2003
Posts: 8,405
Highland, MI.
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The most backspacing on any stock wheel I've ever sold was on GM 15x7" wheels: 4-3/8". MOST wheels are right around 4" BS - even on a 6" wide wheel.
No Man With A Good Car Needs To Be Justified
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Re: Wheel backspacing questions
[Re: 6PAX]
#2870046
01/06/21 08:24 PM
01/06/21 08:24 PM
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Joined: Jan 2003
Posts: 12,256 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,256
Benton, IL.
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Wheel manufacturers will not sell a wheel that is compromised with an attempt at building a wheel with too much backspacing. In other words, you will not be able to order one that exceeds the safety threshold. This is what I was getting at. What is the safety threshold? I agree with the above and will add that I am sure that it is not 'one size fits all'. Different wheels will very likely have different safe limits. This is a question for the particular wheel manufacturer IMHO.
Master, again and still
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Re: Wheel backspacing questions
[Re: 6PAX]
#2870227
01/07/21 04:29 AM
01/07/21 04:29 AM
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Joined: Jan 2007
Posts: 10,161 A Red State
SNK-EYZ
I Live Here
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I Live Here
Joined: Jan 2007
Posts: 10,161
A Red State
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The rear wheels on a Gen 1 and Gen 2 Viper are 17 inch diameter and 13 inches wide with a 10 inch backspacing.
As has already been said, wheel manufacturers would build and sell it if wasn't strong enough. Too much liability if it could meet specs.
Kayse can't keep up at all now. lol
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