What is the biggest tire that will fit?

[Riff Raff]

2001 vehicross with ome 919. What is the biggest tire that will fit with this spring lift?

For the absolute biggest VX set-up with the least amount of fitment headaches is to use this specific wheel/tire set-up:

WHEELS: 2000/2001 OEM 18x7 Stock Rims (any "aftermarket" rim will create excessive rubbing issues due to non-OEM backspacing/offset).

TIRES: LT285/75R18 (11.5 x 35). Still able to fit on a 7" wide rim (i.e. OEM 18x7). There are only four(4) tires made in the world in this specific size, they are:

A. Toyo, Open-Country A/T (35" O.D./67 lbs)
B. Toyo, Open-Country M/T (35" O.D./70 lbs)
C. Maxxis, MT-762 "Bighorn" (35" O.D./70 lbs)
D. Good/Year, Wrangler MT/R with Kevlar (35" O.D./65 lbs)