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    Ideal backspacing for rear wheels

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    TylerW
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    Ideal backspacing for rear wheels Empty Ideal backspacing for rear wheels

    Post  TylerW 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.
    Sweet Seventy9
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    Ideal backspacing for rear wheels Empty Re: Ideal backspacing for rear wheels

    Post  Sweet Seventy9 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.

    Ideal backspacing for rear wheels Mvc-7910
    Myloth
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    Post  Myloth Sat Jan 02, 2016 10:26 am

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

    Ideal backspacing for rear wheels Th_P9010002

    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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    Post  Sweet Seventy9 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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    Post  Myloth 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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