That bike has been having this problem for a while if the tire has worn through the front fender just by rubbing under hard stops. I would be checking this out right now if it was my bike. There is something not right here. I just can't see your slightly oversized tire causing this. If the tire was big enough to cause rubs I think it would do it all the time, not just under hard breaking. As someone has already said, look at the axle bolts and the fender bolts, something is not as tight as it should be.