Unless you have the wrong bolts for your wheels, (changed your wheels?) they should not be bottoming out. Your car must have bolts, and not simply nuts, that is there are no studs coming out of your wheel. Bolts that are too long will hit the disk. I suspect a bearing more than anything else. If you want to eliminate the possibility of your bolts, add a thick washer and tighten them to see if anything changes. Of course, don't drive the car like this.