stud pattern difference c3 and c4

[87droptop]

Hi all, would anyone know the exact wheels stud measurments for a c3 and a c4( or holden, bmw), i can get these adaptors from the US but i need to know the original size to make fit the holden/bmw/c4 wheels onto the c3.
THANKS...

[gtc]

This site may help. It lists the PCD (or bolt pattern) for Vettes:

http://www.vehicle-bolt-pattern.com/chevy-lug-reference-guide.html

[87droptop]

thank you

[87Z51]

Problem is going to be wheel offset / backspacing differences; very big on C4 rims ( 6"+ ).
By the time you space the  rim out to clear suspension may be too far outside guard
PM me if you want to borrow a C4 rim to test fit

[87droptop]

thanks mate, i do also have a c4 with 18" wheels, and i was told the offset is very big on that, but my main issue is that i was told that the stud pattern varies, so i was going to get 2" spacers that fit a c3 then the other end will be a c4/holden/bmw pattern, then i have a much greater choice when picking the wheels for the c3. so from what you know, you think c3 and c4 stud patterns are the same?? i can see a very deep dish on the c3 standard wheels, i'm sure not many other wheels will fit, but then by doing this i might have a lot more options. Thanks again.

[BlueVette]

FYI, BMW bolt pattern is 120mm and Corvettes have 120.65mm (4.75")
I would NOT bolt 5x120mm pattern wheels without adaptors on a Corvette!:eek:

[87Z51]

from what you know, you think c3 and c4 stud patterns are the same?? i can see a very deep dish on the c3 standard wheels, i'm sure not many other wheels will fit, but then by doing this i might have a lot more options. .

Stud pattern is the same

From what I am seeing online C3's ( 78 at least ) had 4" backspacing
So a 2" spacer would let you run a 6" backspacing rim
Biggest problem with aftermarket wheels appears to be caliper clearance; not susp clearance

[87droptop]

ok guys, thanks for the info, hopefully all this will work out soon, somehow....