Sometimes when I'm driving, I'll here a clicking sound coming from my wheels (Centerlines). I removed the centercaps and the noise stopped. Any idea what causes the centercaps to make this clicking noise?
run a bead of silicone around the contact area. That will stop it. You can glue them in place this way, or let it dry, then install them. Either way, it will stop the noise. I would use clear.
I would use something like electric tape and wrap it around the wheel end of the cnetercaps a couple times for a little less permanaent solution. Glueing them in place will not let you balance them in the future, BTW.
I used to have centerlines, and twice the center caps came off whille on the highway, luckily i found it both times, but i would guess what your hearing is a loose cap, i just superglued mine. it worked. I heard that noise too right before it flew off.