Obsidiansixer

iTrader: (1)

Will these offsets work well?

18x8.5 with a +56mm (front) offset & 19x10 with a +79 mm (rear)

Thanks,
Ricky

Jontall

Here are my CCW specs and they are perfect. From these you can judge what will work.
19x8.5 +42mm front
19x10 +54mm rear
Center bore= 69.6mm
12mm studs
Lug pattern= 5/120mm

05redGTOinNC

Not even close

stock is 8" at a +48, so front you will be adding .5" + 8mm towards the strut, not good

rear i won't even discuss

Obsidiansixer

iTrader: (1)

Well I can get the 19 x 10's in a 56mm rear offset, so hopefully, 2mm doesn't make that big of a difference, lol...

And with the front, couldn't I just make a 14mm spacer and all is gravy?

Obsidiansixer

iTrader: (1)

And please excuse my idiocy.. but do I need to worry about centerbore?

05redGTOinNC

Upgrade the studs to ARPs and you will be able to run that spacer. On stock studs, you would be risking it.
Hubrings will help, some say required. I have ran some sets of rims without them, but I have also used plastic ones instead of billet ones (more expensive).

edit: and if you haven't already, go ahead and grind or roll your fenders, just be careful if you grind, there are two body welds that you don't want to cut out, I had mine done by a competent shop just to make sure, as it is pretty thick.

Obsidiansixer

iTrader: (1)

Yeah, I'm gonna be using the 5 x 4.75 bolt pattern, so I was planning on using the ARP Studs anyway. :-)

Whats the diameter of the GTO hub?
The wheels I'm looking at have a center bore of 70.70mm. Wanna make sure the center bore is ATLEAST bigger than the cars hub.

EDIT: I'm seeing 69.5 Hub diameter(is this correct?). with a difference of 1.2mm... Should I care to get hub rings? Are they even available in such a miniscule slimness?

EDIT2: Yeaaa.... That leaves like a 1/42-inch of a tolerance between them. Sounds peachy to me! :-)

Obsidiansixer

iTrader: (1)

Can someone more educated than I please verify these conclusions?

Thanks,
Ricky