Cman

I mounted up a set of 315/30/18 DR on rear C5 Z06 wheels 18x10.5" for my 09 Z06. A buddy of mine has a 95 Z28. Does anyone know if my wheels will fit on his car??

I know the bolt pattern is the same, just not sure about the offset or the width of the wheel whether it will fit or not.

We'll probably test fit it on his car one of these days just wondering if anyone knows for sure if they fit or not. Thanks.

Tony

94yellowta

I've got the 19s in the rear and 18s in front so I'm assuming they'll fit

Injuneer

Let's move this to the "Wheels and Tires" forum.....

Factory Z06 wheels, or aftermarket repros? If aftermarket, what is the offset? As you already noted, it's the offset that determines whether they will fit, not the wheel diameter. Are you using these on all 4 corners, or just in the back?

Stock Z06 18x10.5 wheels have a 58mm offset, which gives them an 8" backspace. That is very deep for the front, and would probably require spacers. Its probably going to put the rears right up against the inner fender and the projecting corner of the jounce bumper bracket, requiring heavy hammering and some griding, or thin spacers.

Cman

These are factory C5 rear Z06 wheels and I would like to try them on the back of my friend's 95Z28. Don't know for sure what the offset is on these wheels.

One other thing, what about the hub diameter???

Injuneer

The rear axle hub diameter on the 93-96 4th Gens is about 0.03" larger than the front hubs. As a result, if you are using later 4th Gen wheels, or Corvette wheels, you usually have to lightly sand or grind the inside diameter of the wheel hub holes so they fit loosely over the hubs. The rear hubs were resized to match the front hubs in 97, so you wouldn't have this problem on a 97-02 4th Gen.

All of this is covered in the Wheels and Tire FAQ, stickied at the top of this forums topic listing.

Ocala93TA

What he said ^^^^^ i have a set on my 93 no problem except the inner wheel on the back just sand or dremal out very little and they will fit right on .

SSCamaro99_3

Out of curiosity, where is backspace measured from. 58mm = about 2.28 inches. Thanks.

Injuneer

58mm is the offset, not the backspace. The offset is the location of the centerline of the rim width, relative to the face of the axle mounting flange.

The backspace is measured by putting the wheel face down on the floor, putting a straight-edge across the back of the rim, and measuring straight down from the edge of the straight-edge to the face of the center mounting surface.

Mathematically, backspace equals the total width of the wheel (rated width plus two tire bead retaining flanges) divided by 2, plus the offset.

For the 10.5" wide wheels with 58mm offset:

(10.5 + (2 x 0.466))/2 + (58/25.4) =

(11.432 / 2) + (2.28) = 5.72 + 2.28 = 8.00"

The 0.466" flange width is an assumption, since that is not a standardized dimension, and varies with each wheel design. But it is useful for approximation and works surprisingly well with the Corvette wheels.