I have a F650GS with the std sprockets....I have essentially NO vibration from 40 to 75mph. At around 85 there is a slight buzz. I do have throttle Miester installed...ie stainless steel bar end weights.
While I normally use Tourance EXPs
For my Alaska trip I put Hideneaus on....they have a significant front wheel resonance at around 20mph. But after the 1st 1000 mile( worn in a bit) nothing on the hiway....they do sing to you though.