Question on rear tire to frame clearance.

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roger1

G-Body Guru
Aug 23, 2010
537
767
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San Angelo, TX
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_60691.JPG


IMG_60772.JPG


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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UNGN

Comic Book Super Hero
Sep 6, 2016
3,048
3,264
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Southlake, TX
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.
 

roger1

G-Body Guru
Aug 23, 2010
537
767
93
San Angelo, TX
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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bracketchev1221

Royal Smart Person
Jan 18, 2018
1,386
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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.
 

roger1

G-Body Guru
Aug 23, 2010
537
767
93
San Angelo, TX
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_6097.JPG


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

roger1

G-Body Guru
Aug 23, 2010
537
767
93
San Angelo, TX
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?
 
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