Am I thinking about this correctly.....
If I get a 15x8 Rallye with 4.5" BS and use a 275/60 BFG that has an advertised Section Width of 11" on a 8" rim, then the distance from the mounting flange in-ward toward the springs would be:
8" Rim / 2 = 4". Since the BS is 4.5 then the flange is moved outward .5"
So, 11" Section Width / 2 = 5.5" (center of tire)
Move this out by the .5" will give you 6". SO, if I wanted to run this tire/wheel combo, then I would need at least 6.25" of measured clearance from drum face to suspension. Likewise, I would need 5"+ from the drum face to the quarter panel lip to clear (11-6= 5")
Is this right?