I'm up in the air about this very question. I think there needs to be some specification made between spindle and non-spindle kits. The widened track of a spindle kit is going to remove clearance. There is no doubt about it. If you're using a full-drop kit where both upper and lower arms are lowered like Full Traction, Superlift, Procomp, or CST, I would think a larger tire is going to clear. Any thoughts?