Vibration at 75mph. Bad hub?

I would clean those hubs up really good, remove the bearing races, and take a REAL GOOD LOOK

Your description does not sound "right."

I HAVE had a failed hub, years ago, on my 70 RR. The inner race on one side "ate" the bore out so that the race was !!!LOOSE!!! at the bottom of the hub bore.

I could not tell by wiggling the hub around on the spindle. It sure as heck caused a "wierd" vibration.