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 Post subject: My Tubbing Project...
 Post Posted: Sat Nov 18, 2006 5:18 pm 
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Location: Tell City, IN
Doing some figuring and measuring..How does this sound..
I measured a friends truck's rear etc.. it has a 38" Rear Wheel mounting face to Wheel mounting face (or Outside to outside)
So I measured my bedside Wheel well to Wheel well it measures 64.5"
Ok So if I use a 15x15" wheel with 4.5" backspacing
the tires have a 17.90" Section width. so this comes out like so
38" Rear
10.5" rim from wheel mounting surface per side 21" total
plus the Section width of 2.90 per wheel go Half for the outside 1.45
So 38+21+2.90 (both wheels)=61.90"..well say 62"
That leaves 2.5" or 1.75 per side for clearance...
Am I correct?..if my measurements are right anyway?.. :-k

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Best 60' 1.2537 Alcohol Injection 4-29-11
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 Post Posted: Sun Nov 19, 2006 12:26 am 
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jody , you are correct, is that going to give you enough room?

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 Post Posted: Sun Nov 19, 2006 8:58 am 
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This was posted under the other thread where we discussed this. I'll stand by it now too! O:) Here is the link to the thread.

http://motorsportsvillage.com/forum/vie ... php?t=1194

"Jody I'd recommend that you get the wheels and tires you plan to run, set them up in the back of the truck where you want them to be then measure between the back of the wheels. That way there is NO mistake on what width that housing needs to be. If you don't want to buy that stuff right now, maybe you could find someone that has a set they would loan you so you for a trial fit.

At any rate its better to have the stuff there than to try to gestimate or use the "WAG" factor trying to figger it out. Trying to find the section width of a mounted tire can be a shot in the dark at times and trust me, you don't want to do this WRONG then have to do it OVER!

As far as backspacing goes I've built two cars and they were both setup with the wheel backspacing at half the wheel width, ie, 15" wide wheel has 7.5" backspacing, 14" wide wheel has 7" backspacing. The Camaro I have now has 7.5" backspacing on a 15" wide Weld Drag Lite."

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 Post subject:
 Post Posted: Sun Nov 19, 2006 11:32 am 
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If you go with more backspace, the lighter the end result will be. Shorter axles & housing.... O:) =; Also don't forget that your housing does not measure from wheel to wheel. The axles do stick out from the housing ends and there are rotors/drums there also. =; Barry

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 Post subject:
 Post Posted: Sun Nov 19, 2006 5:37 pm 
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More back space has other Plusses. Shorter Axeles are stronger, Less unsprung weight, and The brakes get more air that keeps them cool, so you don't get as much air pressure build up in the tire. The down side is room if you get too much. Some say an even backspace makes a tougher wheel, but unless your trading paint, I wouldn't worry about it.

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 Post Posted: Sun Nov 19, 2006 5:55 pm 
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us7race wrote:
Doing some figuring and measuring..How does this sound..
I measured a friends truck's rear etc.. it has a 38" Rear Wheel mounting face to Wheel mounting face (or Outside to outside)
So I measured my bedside Wheel well to Wheel well it measures 64.5"
Ok So if I use a 15x15" wheel with 4.5" backspacing
the tires have a 17.90" Section width. so this comes out like so
38" Rear
10.5" rim from wheel mounting surface per side 21" total
plus the Section width of 2.90 per wheel go Half for the outside 1.45
So 38+21+2.90 (both wheels)=61.90"..well say 62"
That leaves 2.5" or 1.75 per side for clearance...
Am I correct?..if my measurements are right anyway?.. :-k


The only thing I see is that you would be left with 1.25" ( 1.30" ) clearance per side not 1.75" you have posted.

How much clearance do you have to the frame rails ?

Everything has been covered very well and like Bubstr said, the narrower the axles the stronger they are. I also add that the less backspace the easier the tires / wheels are to install on the car.

That might not mean much with some cars but on my 64 Malibu I had to go through a 1 1/2 hour ritual to install them due to the offset I had. And the guy that owns the car now since he went to street tires has to remove the complete rear end, install the wheels and tires and then roll the whole assembly, install it, bleed brakes etc.

Its not like its something that gets done often at all but sure is a pain when it is done.

Here is a picture from when I was setting my 64 up. Like it was said, put both wheels and tires in place and then I ran a piece of pipe through them that was about 7' wide and used it to square up the wheels / tires to the frame / body. and it also made it much easier to measure the inside to get the over all axle width.


Last edited by DCarr on Tue Nov 21, 2006 11:51 am, edited 1 time in total.

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 Post subject:
 Post Posted: Sun Nov 19, 2006 10:09 pm 
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Location: Tell City, IN
I haven't got the frame finished yet have to pick up some more metal..
The plan is outside of the frame rails will measure 24"..and you are right on the 1.25".. From what everyone is telling me there is really no other way around this except for getting the wheels and tires first or a loaner set to get it done..Just it is a $900 hit to get them..so I'll either have to wait til after christmas or get the loaner set and get the rear finished..
Thanks for the help guys. \:D/

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6.11@110 Gas
1.3718 Sixty Foot with the rear wheels Gas

6.07@110 on Alcohol Injection with a 4-link 4-6-12
Best 60' 1.2537 Alcohol Injection 4-29-11
Thru the Mufflers!!


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 Post subject:
 Post Posted: Sun Nov 19, 2006 10:15 pm 
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If the wheels are Welds, you might should look for some loaners. All the places I have checked are having trouble getting them. :-$

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 Post subject:
 Post Posted: Sun Nov 19, 2006 10:59 pm 
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Weld filed for bankruptcy. American Racing is buying their assets.

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 Post subject:
 Post Posted: Sun Nov 19, 2006 11:37 pm 
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Yeah, I read about that. Looks as though they are getting behind. =;

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 Post subject:
 Post Posted: Mon Nov 20, 2006 2:28 pm 
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Jody, I run 15" alumastar and I am pretty sure it's a 4.5 backspace with a MT 16x32. the cross section on the tire is 18.5" . I know that's slightly wider than what you want but if you want to use them to mock yours up you can come get them. I'm finished for the year so I will just have to find something to roll my car around on.
Chuck

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 Post subject:
 Post Posted: Mon Nov 20, 2006 10:25 pm 
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Location: Tell City, IN
Appreciate the offer Chuck! We will see I guess. I done a little work on the frame tonight some cutting and started boxing the rear crossmember in..Will do more tomorrow night. =;

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6.11@110 Gas
1.3718 Sixty Foot with the rear wheels Gas

6.07@110 on Alcohol Injection with a 4-link 4-6-12
Best 60' 1.2537 Alcohol Injection 4-29-11
Thru the Mufflers!!


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 Post subject:
 Post Posted: Sat Dec 16, 2006 1:27 pm 
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Any progress, pics?

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 Post subject:
 Post Posted: Sat Dec 16, 2006 8:58 pm 
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No Pics Sorry... The frame work is about done though. Been slacking
a bit on it. Got to help my uncle with his tomorrow get his ladder bars and coil overs under it..while the weather is in the 60's!! I am sure it will pay us back soon enough!

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6.11@110 Gas
1.3718 Sixty Foot with the rear wheels Gas

6.07@110 on Alcohol Injection with a 4-link 4-6-12
Best 60' 1.2537 Alcohol Injection 4-29-11
Thru the Mufflers!!


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 Post subject:
 Post Posted: Thu Jan 18, 2007 9:11 pm 
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Location: Tell City, IN
Well I ran into some cashflow issue's. After all the work I have already done on the rear suspension it will have to wait to get finished.
I guess I will be stuck with the same size tire and rim til most likely next year. [-( At least them all I will need to do is get wheels, tires, and the rearend narrowed..all the frame work is done. :-({|=

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6.11@110 Gas
1.3718 Sixty Foot with the rear wheels Gas

6.07@110 on Alcohol Injection with a 4-link 4-6-12
Best 60' 1.2537 Alcohol Injection 4-29-11
Thru the Mufflers!!


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 Profile  
 
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