I'm experiencing a slight shimmy in the handlebars if/when I take my hands off the bars. I don't recall the bike doing this in the past. It seems to be more noticeable at slower speeds. I just replaced the front rotors and pads due to pulsing, and was hoping that would fix the shimmy, but it didn't. I did put a new front tire on last year. I took it off over the winter and had it balanced again at a local shop. That didn't do anything either. I don't recall the bike doing this before I put the new front tire on. Is it possible the tire is out of round or something? Any help is much appreciated. Thanks.