If you can actually "feel" a knocking/thudding type of noise, check that wheel immediately and see if your lugnuts are secure. I too had a clunking noise (coming from my left front area of car) and thought my suspension was going or my tire picked up something.

When I pulled my car into the parking lot, I popped the damn hood, checked to see if there way anything loose in the engine bay, checked all around the tire, brake disc, etc. Next, I checked my lugnuts to make sure they were tight, and guess what, the fuc*ers were loose as all hell. I could actually spin them freely with my fingers. My frickin' wheel was literally walking itself off the damn studs. Thank God I pulled my damn car over. Apparently, the person who was working on my car, didn't torque down the damn lugnuts tight enough, or forgot to torque them down altogether. So, I jacked the car up, tightened the things down myself, and the issue was resolved.

Anyways, hope you find and resolve the problem you're having.