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    Ideal backspacing for rear wheels

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    TylerW
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    Ideal backspacing for rear wheels

    Post  TylerW on Fri Jan 01, 2016 8:43 pm

    Hey guys:

    I'm going to be upgrading wheels on my '77 Caprice coupe from an ancient set of Vectors to 8" Ralleys. I already have a nearly new pair of 255/60/15's I plan to use for the rear, so what amount of backspacing will get things out to near the fender lip without rubbing? Thanks.
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    Sweet Seventy9
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    Re: Ideal backspacing for rear wheels

    Post  Sweet Seventy9 on Fri Jan 01, 2016 10:52 pm

    Welcome to the forum!

    Using an 8" wide wheel, 3" backspacing will put them pretty close to the wheel lip without rubbing.  Using 255's, 2" might even work better.  

    Here's a pic of 15x10 Rally wheels with 5" backspacing (295/50 tires).  When using an 8" wide wheel, 3" backspacing will put it in a similar position.



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    Myloth
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    Re: Ideal backspacing for rear wheels

    Post  Myloth on Sat Jan 02, 2016 10:26 am

    Here  is the same tire\wheels with a 1" spacer behind the wheels .



    Although it is a different Rear end anyone know the width difference between a 7.5 79' rear and 95-96 Posi 8.5?
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    Sweet Seventy9
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    Re: Ideal backspacing for rear wheels

    Post  Sweet Seventy9 on Sat Jan 02, 2016 11:18 am

    Myloth wrote:<snip> Although it is a different Rear end anyone know the width difference between a 7.5 79' rear and 95-96 Posi 8.5?

    IIRC, one inch wider. (1/2 inch on each side)


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    1977 Impala Landau x1
    1977 Caprice Coupe x3, Sedan x3
    1978 Impala Landau x1, Sedan x2, Station Wagon x1
    1978 Caprice Landau x1, Caprice Coupe x2
    1979 Impala Coupe x2
    1979 Caprice Coupe x7, Landau x4, Estate Wagon x1
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    Myloth
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    Re: Ideal backspacing for rear wheels

    Post  Myloth on Sat Jan 02, 2016 7:35 pm

    I thought the tires stuck out a tad more so that's actually 1.5" out from the stock rear in the first pic .

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