If the noise and vibration is coming from the tires itself, at higher speeds the vibration goes through an oscillating wave of increasing and decreasing power. If it is constant I would think it genenrally means the rim itself. Lucky for you, identifying a rim problem is as easy as two things, grabbing a friend or taking the thing to a rim/tire shop.
Tell a friend to drive aside the car looking at each tire individually travelling at 60 mph or whenever the vibration is most apparrent. Choose a smooth road, clear of traffic. The messed up rim/tire should be very easy to spot amogst the others.
The other thing u can sdo is just take it to a shop to get it balanced. Their machine ill tell them if the balance is off or untrue. A visual inspection of the tire /rim will check for bubbles, dings, dents, or cracks.