[Superman]

I'll bet dollars to donuts your wheel bearings are not the problem. Wheel bearings don't tick. They howl.

I just finished discussing my OXS system in a nearby thread (Car is Trying to Freak Me Out) and I'm reminded of the mystery ticking I fixed two years ago. It fooled me into thinking it was a wheel noise, since its rhythm was with the wheel rotation. And it sounded like it was coming from the front. It turned out to be the mileage counter for the OXS light.

Do this: Raise the rear of the car and put it on jackstands. Start the engine, put the car in first gear and let out the clutch. If the ticking noise is heard, you need to disarm your OXS counter. Remove the speedo or clock. The counter is a rectangular thing with a button for purposes of resetting the OXS light. You don't need the OXS light, as all it does is come on every X miles (where X= 30K I believe).