Same thing happened on my driver's side as well, and I've got 215s!!!
Dave, what actually happens is the inside edge of the tire hits the wheel liner, which causes the bumper ends (where it attaches to the chassis) to flex inwards toward the wheel well, thus touching the outside part of the tire and doing damage.
I've managed to rub big holes through my wheel liners, and now I have no problems w/ rubbing, so the bumper doens't flex inwards now either.
Check your wheel liner, bet you're rubbing a hole through it w/ the inside part of the tire.
John
