You can also have someone else ride the wheel at speed and see if they experience the wobble as well. If they do, then a wheel balancing may be the order of the day. I used to do this with my old Zipp 440's. Found out that the balance was off, called Zipp and found out that the rims were off balance by about 30grams. Balanced the wheels out with some lead foil tape and the problem went away. But at the same time, don't discount the previous advice as the previous points were spot on in my opinion as well.