If you have another Valk near by , why not change the front tire and wheel and see if the problem goes to the other bike. I would not adjust to a tire vibration. I would want to know why. At the shop I work at part time , we change a lot of tires. Very few balance issues on new tires.
da prez
Mine isn't a tire balance issue. I can ride at all speeds easily with no "vibration". Mine is absolutely a road contact feel rumble, especially when leaned over at all in either direction. If you've ever had a bike with a scalloped front tire, you know the feeling. My tire has no abnormal wear; it's just the tread block design that gives that feel.