Hey, I just installed some new 19" rims and I didn't get an alignment so I am not sure if thats it. When I am on the freeway and if I am not touching the steering wheel it shakes back and forth ever so slightly, kinda vibrated back and forth. Does that mean anything? It did not do this with the stock tires? The car doesnt move one war or another when the steering wheel is straight and when my hand is on the steering wheel it doesnt do this, larger and wider rims mean this is normal now? Any help, thanks a lot?

 

Have them re-balanced.