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275's all around on a B-body ?
#80365
06/27/08 12:43 AM
06/27/08 12:43 AM
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Joined: Sep 2003
Posts: 10,645
Houston, Tx
AlexP
OP
I Live Here
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OP
I Live Here
Joined: Sep 2003
Posts: 10,645
Houston, Tx
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I need some outside the box type thinking right now. I want to put the same size tires all around on my Roadrunner. I've seen Todd (blackwidow69) manage to squeeze 275's in on the front of his 69 Roadrunner.  With 255's on 15x7 steelies (4 inch backspacing, right ?) I have rubbing at the rear of the front frame rail. In it's defense, that wheel is not the right size for even a 255 and the sidewall bulge is significant. With the right backspacing and right width wheel, I don't think I will have the same issue even with a 275 on a 9.5" wheel. What backspacing would you use to get a 9.5" wheel onto the front of a 68 B-body ?
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Re: 275's all around on a B-body ?
[Re: AlexP]
#80367
06/27/08 03:50 AM
06/27/08 03:50 AM
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Joined: Jan 2003
Posts: 27,467
So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,467
So Cal
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Quote:
I need some outside the box type thinking right now.
I want to put the same size tires all around on my Roadrunner. I've seen Todd (blackwidow69) manage to squeeze 275's in on the front of his 69 Roadrunner.
With 255's on 15x7 steelies (4 inch backspacing, right ?) I have rubbing at the rear of the front frame rail. In it's defense, that wheel is not the right size for even a 255 and the sidewall bulge is significant. With the right backspacing and right width wheel, I don't think I will have the same issue even with a 275 on a 9.5" wheel.
What backspacing would you use to get a 9.5" wheel onto the front of a 68 B-body ?
What diameter rims are you looking at?
What is Todd's combo? Just copy it.
If 17" I'd go 5.25 on a 9.5 width rim with a 275/40/17 tire. That will probably rub the inner fender at max turning, but won't rub the outside. You might be able to run a little less backspacing on a B-body. But you could always add a good .25" spacer.
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Re: 275's all around on a B-body ?
[Re: AlexP]
#80371
06/27/08 02:36 PM
06/27/08 02:36 PM
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Joined: Jan 2003
Posts: 27,467
So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,467
So Cal
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Quote:
The tech I spoke with took down my current numbers and suggested that I buy a 17x9.5" in a 5.5" backspacing, mount it up without tires and if it doesn't fit I can return it and try a different size.
Do you have flat type upper ball joints or the domed type?
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Re: 275's all around on a B-body ?
[Re: Mr.Yuck]
#80375
06/27/08 03:45 PM
06/27/08 03:45 PM
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Joined: Sep 2003
Posts: 10,645
Houston, Tx
AlexP
OP
I Live Here
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OP
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Joined: Sep 2003
Posts: 10,645
Houston, Tx
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Quote:
That would look silly. the car would look like a 4WD vehicle.
No, not really.
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Re: 275's all around on a B-body ?
[Re: topside]
#80378
06/27/08 11:11 PM
06/27/08 11:11 PM
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Joined: Mar 2006
Posts: 1,404
northeast ohio
hulmule
pro stock
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pro stock
Joined: Mar 2006
Posts: 1,404
northeast ohio
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I ran 275 60 15 on cop rims all the way around. looked like a old nascar or moon shine runner. I did notice that a little paint was rubbed of on the front frame rails. never heard it but it must have happen. If you want a picture send me a email address cause this site i cant seem to post any oictures . to big of a file. phil
1969 Dodge Coronet R/T Convertible
1979 LiL Red x2
2012 Yellow Jacket
2006 mega cab
1977 Trailduster
1979 Trailduster
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Re: 275's all around on a B-body ?
[Re: hulmule]
#80379
06/27/08 11:34 PM
06/27/08 11:34 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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w/ some spacers and airshocks lol you can run these fatties in the rear. no wheel well modification. Special order Pirelli P-zero street tires.
I'm going to ditch these and go w/ magnum 500's though.
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Re: 275's all around on a B-body ?
[Re: AlexP]
#80381
06/28/08 02:42 AM
06/28/08 02:42 AM
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Anonymous
Unregistered
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Anonymous
Unregistered
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 17"/9"/4.5 backspace 275/55/17in back and 245/45/17 up front with rear sway bar no rubbing at all but no room for bigger tire terry
Last edited by r4redbird; 06/28/08 02:47 AM.
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Re: 275's all around on a B-body ?
#80382
06/28/08 09:25 AM
06/28/08 09:25 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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a board member had '01-04 mustang 17x8 rims on his '69 RR using 3/4" thick bolt on spacers (makes for 5" effective backspace) all the way around and 255/50R17 BF goodrich KDWS's and they fit fine. I have the same setup on my 5th ave
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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, but performance wise, it would not matter 
