wheels causing ticking sound

ok i've got 15*8.5 centerline warriors with 4.5" backspacing on my 87 gt. i got around the tire rub i believe but i'm getting a ticking sound thats bout to drive me nuts. seems like i read someplace that its caused by the caliper bolts. thinking bout grinding them down a little and see if that helps. it only makes the sound when i cut the wheels either direction. any ideas?
 
Once I was freaking out cause I could hear a ticking everytime my tire spun and it would speed up/slow down with me. Figured out it was a peice of gravel stuck in the tread rofl...just a thought if you drive on gravel any.
 
kinda doubt its the bearing though i'm not dismissing that possibility. just poked my finger through the wheel holes. don't feel like i got much clearance for the caliper bolts or the housing for that matter. it'll be ugly but think i'll grind a little off and see what happens