just and FYI...I checked for runout (wobble in rear tires/hub/axle) on my z400 before ever riding it. right side had a slight wobble. did not appear to be axle or tire, looked more like rim or hub. new owners should look at this before first ride and report back. may be a case of wide tolerances from the factory.

 

When I went to pick up my Z at the dealership my dad notice a little "play" in the front right wheel/tire that wasnt in the left one. The salesman felt it too and had a machanic check it out. A bolt for the shock needed to be tightened, but the play was still there. When another Z was just finished being put together we checked for the wheel play on that one. Same play on right wheel/tire, but not on the left. My dad just said that it will happen to both sides once it is broken in, and that it doesnt look like a problem.