backspacing on a 86' Cutlass Supreme

sadisticsavage · Feb 4, 2014

Whats the most backspace I can run on the rear of a stock 1986 Cutlass Supreme? I was wanting to run 15x10 or 15x8 rims. Most are about 4.5" or 5" backspacing. The reason I ask is there is pictures of a beautiful cutlass running those after market rallye wheels but the only 15x10s I can find in that option rim is 5". Im not really interested in running adapters so thats why I ask. Ive done the forum search but cannot seem to get a straight answer.

Chris Van · Feb 5, 2014

You will get all kinds of replies on this question. I thought these cars were all pretty much the same but apparently not.
HOWEVER, based on my experience with my personal cars. I have found that a 4 1/2" back spacing with a "bulging" tire will tend to rub lightly on the inside. A 4" back spacing actually worked better for me. But the 4 1/2 worked too. It would just rub enough to rub the paint off the frame.

sadisticsavage · Feb 5, 2014

Alrighty good to know. Thank you very much. I plan on running a 15x10 with 4.5 backspacing with a 275 tire. What size tire did you run?

FE3X CLONE · Feb 5, 2014

Easiest way to check is to measure your car and find out.

But 5" BS isn't going to fit without hitting the frame. I don't remember what my measurement was but from the wheel mounting face on the brake drum to the frame was less than 5" if I recall.

I think total wheel well width was around 11".

jociha · Feb 5, 2014

I hope this works or you can find it. 275 tires look very nice on a 8in rim. I have seen 275's on the factory 7in rims and that looks good. You could try putting one 275 on the factory 7in wheel, install it and take some measurments to see what back space will work compared to your factory wheel backspace. This frame notch article will gain you about an inch but 10in rims may be difficult to get under your wheel well.http://www.maxchevy.com/tech/2008/iii_8-frame-1.html

sadisticsavage · Feb 6, 2014

Well I googled and googled and found that the 275s dont look bad on an 8inch rim like you said. And a friend of mine has 15x10s with a 275 tires with a 1.25" spacer on his Monte Carlo. So for now I will just buy the 15x8s but in the future move up to the expensive 15x10 rims Im drooling over haha. The 8s do not look bad at all with that 275 on it. Thanks for you help guys. Backspacing is such a funny deal when you can like three different 10" wide rims but they all have different backspacing. But to make things easy I might just buy one of those tools that measures what you cars actual allowance is.

cutty · Feb 10, 2014

my welds have 4 inch back spacing, there 15x8s with 275s, i dont look the look of it, gonna drop it down to a 255/50

jociha · Feb 10, 2014

cutty said:
my welds have 4 inch back spacing, there 15x8s with 275s, i dont look the look of it, gonna drop it down to a 255/50

What don't you like about it, do they fit in the wheelwells, if the car goes low for any reason or will the tire rub on the outside lip?

cutty · Feb 10, 2014

theres room, but to me looks gay, ill try and post a pic

cutty · Feb 10, 2014

they just way to big for it

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backspacing on a 86' Cutlass Supreme

sadisticsavage

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Chris Van

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sadisticsavage

Not-quite-so-new-guy

FE3X CLONE

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jociha

Master Mechanic

sadisticsavage

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cutty

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jociha

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cutty

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cutty

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