Front Tire Size on a Demon?

IIRC, an LBP disk brake adds 1½" to the front track. I have a 72 LBP disk brake Demon that has 235/60-15 on 15x7 wheels with 4¼" offset. These tires barely clear, but in all honesty, I have the ride height set at the low level of "acceptable" tolerance. The 73 has same wheel specs with 205/60-15 with no clearance problems.