These wheel diminsions are based off of Mike Schultz’s 1998 Lincoln Mark VIII which can be seen in our customer gallery.
Front wheel dimensions: 18×8 w/ 6.375 back spacing
Rear wheel dimensions: 18×9 w/ 7.500 back spacing
I originally preferred Forge Line wheels but Forge Line presented issues that would not allow the front wheel centers to clear Brembo Brakes. However their wheel center’s for the rear would have had the “lip” we were going after. That’s what moved us to Boze wheels. Boze’s wheel centers cleared the Brembo’s, but we lost the rear “lip”.
I have attached two sheets for those interested in putting custom wheels on Marks and T-birds. Remember that the spec’s I have attached are for front Brembo brakes! With that said and what I have learned with 4-6 hours of measuring with an air ride suspension vehicle (it was fun let me tell ya….).
With the package that is on Mike’s car without the ½” wheel spacer we could have gone with:
Front wheel: 18×8.5 w/ 3.125 front spacing ~ 6.375 back spacing
-or-
18×8 w/3.125 front spacing ~ 5.875 back spacing
That would add a ½” to the front “lip” with Brembo’s
Now for the rear wheels we could have made some major changes here. There is a 2” space between the rear brake caliper bracket (cobra rotors) and the wheel spoke with the ½” wheel spacer. So we could have gone with:
Rear wheel: 18×9.5 w/ 4.000 front spacing ~ 6.500 back spacing (with this set-up the
rear sway-bar will have to be moved in ~1/4”)
-or-
18×9 w/ 4.000 front spacing ~ 6.000 back spacing
With the rear wheel spec’s I gave you, you would have around a 3” “lip”
All of these measurements will keep the front and rear wheels tucked under the wheel
arc.
Also, if your running cobra front brakes, add 1.00” to the front spacing and subtract 1.00” to the rear spacing. That would allow an additional 1” to the front wheel “lip” and still clear the front brakes.