wendal

I am wondering if all c4 wheels are interchangeable? 1990 wheel on a 84?
thanks

LongBeachC4

No, 84-87 uses a 38mm offset, after that they went to a 50mm offset. If you use the 50mm offset your wheels will sit inboard further. Just ordered my A-mods on Friday looking to get them today.

QCVette

They changed the suspension starting with the '88 model year.

The later wheels have a different offset that sits more inboard than the early wheels. The offsets for the stock wheels are shown below.

The '90 wheels will fit. (They are also my favorite C4 wheel.) They will be inboard and may not look exactly right, but some people run them without any spacers. A 3/4" adapter/spacer will bring them outboard the right amount. Several people use a 1" adapter that works fine too.

I used a 1 1/4" spacer and they worked ok on the rear(although all the way out to the edge of the fender), but were a little too far out on the front with the 9.5" wheels. On mine with the 1 1/4" adapter with the 8.5" wheel they worked OK and they were all the way outboard as far the fender edge.

Good luck.

OEM Offsets:

84-87 base
8.5" 32mm

84R-87 Z51
9.5" 38mm

88-96
8.5" 56mm
9.5" 56mm

ZR1 rear
11" 36mm

Grand Sport rear
11" 50mm

Philly D

Just keep in mind that the 84 wheel is 16 inch diameter while the 90 is 17!

I'm sure the wheels will fit but you might want to make sure you have enough room under the wheel wells!

QCVette

The fit under the wheel wells is not going to be an issue.

The stock '84 uses 255/50/16 tires that are 26.1" tall.

The 17" tires used on the later corvettes are

275/40/17 -- 25.7"
255/45/17 -- 26.1"
285/40/17 -- 26.0" or 26.1"

So the end result is that if you are using the stock late C4 size tires they are the same diameter or less than the stock early C4 size tires.

You should be fine. They will fit the same as any of the '88 to '96 C4's for tire height.