Help ID'ing a Clicking noise?

I've noticed for about two months now that whenever I take my Dart into the city or in an area with guardrails and such, I can hear a clicking on my left side. It's definitely speed-related, but unless the sound has something to reflect off of, it's too quiet to hear. I've replaced the axle bearings last year and the wheel bearings just this morning, but I still am hearing it. Could it be something in my trim ring? When I have the car lifted and spin the wheel, there's no sound.