Have you used the wheels before? What's the offset as compared to stock? If you have lower offset wheels (i.e. pushed out towards the fenders more) you have increased the scrub radius in your suspension which will cause tramlining. Also, certain tires are notorious for horrible tramlining. I had a set of Bridgestone RE760s that were about the worst I'd ever experienced in that regard.
I'd get the alignment checked out. Check also for loose wheel bearings or worn tie-rods or ball joints. Any of these things can cause dynamic toe and camber changes as you drive down the road which will cause the symptoms you're encountering.
'03 330i ZHP - Stock-ish
'02 330Ci - Megasquirted, E85'd and tuned by PFTuning.com