loud huming noise as you accelerate on 2008 Mercedes-Benz R350

there is a loud humming noise when i accelerate. as i go faster, the noise gets louder. after i pass 85mph, it goes away. i think something is out of balance. is it maybe a wheel baring, drive shaft, or ???? i have 75000 miles onit already

Asked by for the 2008 Mercedes-Benz R350
It's so hard to comment without being able to experience the noise/problem first hand. Can you determine if it is from the front or rear, left or right? Look at the tires first to ensure the tires are worn evenly across the tire thread surface, no strange wear pattern, no flat spots or cord showing. After that I would suspect a wheel bearing. Do get this properly checked out as it has the potential to become a more serious problem.