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GM Rally Rims tire fit specs

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 4x4 Cowboy, Mar 22, 2003.

  1. 4x4 Cowboy

    4x4 Cowboy 1/2 ton status

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    whats the biggest tire i can fit on my rally rims. heres what they look like. does anyone know the rims size specs for these. like how wide they are and stuff. [​IMG]
     
  2. Hossbaby50

    Hossbaby50 3/4 ton status

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    Mine like those were 15x8". You can run tires up to 37x12.5x15 or maybe even wider. I know Tim from 4x4 Iron is running 38x12.5x15 swampers on 15x8's.
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

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    They can be either 7" or 8" wide.

    If you pop the trim ring off, look around the valve stem for a two letter stamp. Something like "JJ". Not always on the "outside" of the wheel, sometimes they will only be "inside" of the wheel where you'd have to remove the tire to see them.

    1" isn't that big of a deal in most cases though.
     
  4. R72K5

    R72K5 Banned

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    15x8 if you clean inside rear of them you will see date anmd size stamped
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

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    Depends on original application, but there ARE 15x7 and 15x8 rally wheels.

    Don't have any reference newer than '79 to look at, but 4x2 K5 rallys (at least '79) are 15x7 stock, 4x4 are 15x8 stock.

    Doesn't help any except that if those are '79 rally's, they are 15x8 /forums/images/graemlins/smile.gif I can't comment for sure on later ones, but probably same "pattern", 2wd got 7's, 4wd got 8's.
     
  6. 4x4 Cowboy

    4x4 Cowboy 1/2 ton status

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    well i checked they are 15x8 and im happy cause i dont need to get new rims even better since i like these ones /forums/images/graemlins/thumb.gif
     
  7. wrathORC

    wrathORC 1/2 ton status

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    They'll be 15x8 with 4" of backspacing. There are rumors of 15x7 ones but the only ones that are 15x7 that I've ever seen are the 2wd ones (5 on 5").

    You can fit anything on them you want as far as height. I wouldn't go wider than a 12.50 tire on them. 13.50 is alright if the rubber is really tall. You start getting really wide and then the tires like to look like donuts and wear like motorcycle tires.

    Go any narrower than 9.50 and the tires are no longer curb feelers, the wheels are. 10.50s are perfect for 8" wide wheels but there is absolutely nothing wrong with running a 12.50 tire on them.
     
  8. R72K5

    R72K5 Banned

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    4x4 are 8" and 2wd can be 6 or 7, vans use 6" ones
     
  9. K5Jimmy

    K5Jimmy 1/2 ton status

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    [ QUOTE ]
    They'll be 15x8 with 4" of backspacing.

    [/ QUOTE ]

    Backspacing is 3 5/8"...most tire manufacturers recommend staying within 4" of rim width....(ie. 12" tire on 8" rim)

    15x7 is 2wd 5 on 5 1/2

    15x8 is 4wd (or pre 70? 2wd) 6 on 5 1/2

    /forums/images/graemlins/thumb.gif
     
  10. R72K5

    R72K5 Banned

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    rally wheels didnt exist til 73 and even then the 73-75 ones used the caps that screwed on from the rear, and the caps are smaller diamter nose than 76-86 ones, hardly ever see any left anymore, most are extinct and not many were ordered. dont forget the old painted GM rally wagon wheels too. they been around since 73 too, 67-72 trucks didnt have this kind of stuff yet, just hubcaps and wheel covers and on the blazers were feathers and eagle option aluminum slots but are rare, i have some brochure pics from GM with blazers with the slots wheels option and feathers decal scheme body


    good luck
     

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