'93 740i with NOISY tires between 40 50mph!
I get a loud 'thrumming' noise from the tires between 40 & 50MPH - loudest first thing in the morning. It seems to go away after about 15 - 20 miles. I've replaced the tires; balanced them twice; had 2 alignments; replaced all four struts; and replaced the tie rods and the connecting bar. There is no perceptable shake or vibration while this noise is going on. If I shift into neutral while the car is moving the noise is still there. So I don;t think it's drive shaft u-joints. I have also cleaned the inside of the wheels and the rotors, around the bolt holes, to make sure there is a good smooth fit.
Anyone got some ideas? This is driving me crazy!
Can anyone offer some insight as to what can be wrong?