Well, I was having this clicking noise from my front end about two weeks ago which turned out to be something in one of my chrome clad wheels. It only made the noise if the wheel was on the driver's side front of the truck but not in any other position. There was nothing apparent that was wrong with the rim so I just had it put on the passenger side and all seemed well. Yesterday I decided to take another look even though the noise is gone and I discovered that the whole lip of the chrome cladding is breaking off!! When you look at it closely you can see that the 315s are probably causing it by being just a little too wide and everytime I hit a bump it's probably putting pressure on the lip.
Just thought I'd give an update....

 

right on at least you found out the problem. glad to hear.