Grims

im thinking about buying longer wheel studs and high quality spacers...I really hate to use a spacer...but its that or or new wheels.

robertotrevino

its weird cuz they have 18x9.5 with 54mm offset they sell them, just no in that package

Grims

call them and ask them to sell them to you in that way. Also, mine seem to be very ehavy...I don't think their really aluminum

Injuneer

You may have the wrong dimension for the C5 Z06 wheel.... according to a table of wheel sizes in VETTE magazine, the C5 Z06 wheels are 10.5" wide, 58mm offset.

And, you're ignoring the width if the flange that holds the tire on the rim. Wheel width is measured where the tire beads seat, not at the outside edge. You need to add about 0.45" - 0.50" to each side for that.

10.5" + (2 x 0.45") = 11.40"

58 / 25.4 = 2.28"

Backspace = (11.40 / 2) + 2.28 = 5.95 + 2.28 = 7.98"

A 7.98" backspace puts the inside edge of the tire against the inner fender. Those of us running the 17x11 50mm ZR1 wheels, with 7.93" backspace, generally have to hammer the fenders.

For the 9.5" wide wheel with 65mm offset:

9.5" + (2 x 0.45") = 10.4"

65 / 25.4 = 2.56"

Backspace = (10.4 / 2) + 2.56" = 5.20 + 2.56 = 7.76"

That backpsace gives you almost 1/4" more clearance for the inner edge of the tire. It will look "sunk" into the wheel well. But with a reasonable size tire, should clear.

And the 56mm offset on the 9.5" wide wheels solves all the problems, giving you only a 7.40" backspace.

robertotrevino

Oh, I see, thanks.