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Question on rear tire to frame clearance.

Discussion in 'Wheels / Tires / Brakes' started by roger1, Apr 16, 2018 at 7:30 AM.

  1. roger1

    roger1 Apprentice

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    Here's a couple of photos of my new GTA/Buick GN 16"X8" wheels. I've got 255/50-ZR16 tires on the rear.

    [​IMG]

    [​IMG]

    Presently, I don't have spacers on them. While the tires to clear, the clearance on the inside at the top next to the frame rail is very tight. Almost 1/4" on one side but only about 1/8" at the other. I don't have a feel for how much the suspension can move under driving conditions and whether it will ever rub. I did jack one side up and they still clear. Jacked the other side up and still clears too.

    So my question to the experts is whether I should put spacers on it?. If so, how thick? Plenty of clearance on the outer side so no worries there if spacers are needed.
     
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  2. UNGN

    UNGN Royal Smart Person

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    1/8" ls too small. I would run a 3/16" shim spacer. Make sure the frame rails are smooth with no welding slag that could catch the side waĺl.

    On a G-body, zero offset is non ideal in back. Ideal is out anorher 3/8" from zero.

    I run GTA Rears in the rear with adapters on both my 2+2 and T-Type.
     
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  3. roger1

    roger1 Apprentice

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    Thanks.
    I don't see 3/16 at Jegs but many choices of 1/4". I'd like to get good quality ones too. Was looking at the Baer billet ones. Expensive but I don't want to risk having inferior quality with something like this. I will be replacing the studs with longer ones too.
     
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  4. Doug Chahoy

    Doug Chahoy Master Mechanic

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    Real nice looking Elco
     
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  5. bracketchev1221

    bracketchev1221 Apprentice

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    Go with whatever spacer you feel comfortable with. I'm using the 7/32" universal spacer on mine. I put a dab of silicone behind it and center it the best I can on the hub and when it dries I put the wheel on. I've been doing it this way for years. When I had the small tires on the Chevelle I used them so they wouldn't rub the inner wheel well. I went 10.30's at 130 with them on it.
     
  6. roger1

    roger1 Apprentice

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    Thanks guys.
    I went out and looked at the car again. I actually have about 3/8 on one side and 1/4 on the other but it's these tags that stick out that cut it down to about 1/4 and 1/8.

    [​IMG]

    Anybody know what the tags are? They sure don't seem to want to come off either.
     
  7. pagrunt

    pagrunt Royal Smart Person

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    Those are the frame ID codes.
     
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  8. roger1

    roger1 Apprentice

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    They sure didn't want the to come off!
     
  9. roger1

    roger1 Apprentice

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    So, If I pry those tags off, I've got 1/4" clearance on one side and 3/8" on the other.
    I think I may do some test drives that way and check for rubbing before deciding on spacers.
    If I detect any rubbing at all, it seems like 1/4" spacers would be plenty.

    Thoughts?
     
  10. Local Hero

    Local Hero Greasemonkey

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    Those tags pried right off on my wagon rails. If that fails you could easily take a grinder to them.
     
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