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Thread: 255 60 15

  1. #1
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    255 60 15

    Will these tires generally fit on my 15 x 7 wheels on my 57 wagon 2” drop front spindles and 8.8” rear with shortened long side axle to match short side?

  2. #2
    Registered Member chevynut's Avatar
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    It's all about wheel mounting surface width and wheel offset. What is the offset or backspacing of your wheels? Are they all four the same?

    It's not clear to me what you're trying to do. Are you wanting to put 255s on all 4 wheels? I'm sure 255s will not fit on front. What is your rear axle width?
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


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    55.75" wide rear axle
    4.25" backset
    8" wide wheels
    triangulated 4 link w coil overs

  4. #4
    Registered Member chevynut's Avatar
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    Quote Originally Posted by 57barnwagon View Post
    55.75" wide rear axle
    4.25" backset
    8" wide wheels
    triangulated 4 link w coil overs
    Is that 55.75" at the wheel mounting surfaces? That seems awfully narrow. The stock rear is 60". Also, I thought you said the wheels were 15x7? If you don't have stock rear leaf springs, you have a little more room for tires. What do the 2" dropped spindles have to do with your original question? Just trying to help.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  5. #5
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    My Dana 60 is 56 wide and my 55 is mini tubbed. If no leaf springs the inner wheel tub is going to be the limiting factor.

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    measured the wheels in the box though it said 7" on the box they measure 8"
    spindles were noted just to confirm 15" minimum wheels were needed to fit the disc brakes
    yes actually 55.5 wheel to wheel mounting surface
    Last edited by 57barnwagon; 02-07-2024 at 03:36 PM.

  7. #7
    Registered Member chevynut's Avatar
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    Quote Originally Posted by 57barnwagon View Post
    measured the wheels in the box though it said 7" on the box they measure 8"
    Wheels are measured INSIDE the flanges. A 7" wheel would be about 8" outside the flanges. So I assume the 7" is correct.

    spindles were noted just to confirm 15" minimum wheels were needed to fit the disc brakes
    So are you planning to use the 15x7 wheels on front with the 255 tires? They won't fit. You need to measure the front wheel mounting surface to see if the wheels will work on front. If you have zero offset rotors, you might be able to run a 225 tire.

    yes actually 55.5 wheel to wheel mounting surface
    The 7" (8"outside) width wheel with 4.25" backspacing will have a .25 positive offset meaning the wheel mounting surface is .25" OUTBOARD of the center of the wheel. That puts the center of your rear tires at 55" with the 55.5" rear width. With 10" wide 255 tires the insides of the tires are 45" apart. The wheel tubs are 46.5" apart so the tires won't fit without a minitub.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  8. #8
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    Quote Originally Posted by 57barnwagon View Post
    measured the wheels in the box though it said 7" on the box they measure 8"
    spindles were noted just to confirm 15" minimum wheels were needed to fit the disc brakes
    yes actually 55.5 wheel to wheel mounting surface
    Not true the the 14x6 Rally Wheels off of my 67 Camaro SS 350 fit my 55 and 56 with disk brakes. Once disk brakes became common 14 inch disk brake wheels were produced.

  9. #9
    Registered Member 55mike's Avatar
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    FWIW..... I'm running 255/60/15 on 8" wheels. The backspace is 3.5", and the 9" F^&d is 58" wide at the wheel mounting surface (vs 60"). It's a very tight fit. 55's fenders by their design tend to be a bit tougher to deal with in these situations. I have to remove the lower shock mounts, pull down on the rear shackles and the tires still drag on the inner fender edge to get in/out. Once in, they look good and don't rub..
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    Last edited by 55mike; 02-08-2024 at 10:01 AM.

  10. #10
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    Looks good Mike I really feel that your 58 inches is about a narrow as you can go without mini tubs.

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