When i first bought my car the front tyres were getting low, i decided to rotate them to the back and i had terrible droning noise from the tyres almost like a wheel bearing kind of grumble. It would get worse at certain speeds. I quickly swapped them back and the noise went away. I then got two new front fitted and the noise is back. The fronts are Eagle F1 3's and the backs are F1 2's, when i did the initial rotation they were all matching 2's. It sounds like its rubbing or something. I did come across a thread that mentioned they were a bit noisy, is it a manufacturing fault with the tyres or what?