I just got back from a long ride, after 2.5 hours I began to feel a vibration coming from the rear wheel it got progressively worse as the speed increased and considerably less vibration as I went slower. I got home and checked tires, rotor and they appear ok. On the center stand I spun the rear wheel and it's making a whining sound and vibrates. I spin the wheels and check my tire before every ride and this result is new to the bike. Can anyone tell me if this is the start of a final drive failure. It's a 2004 and it's still under warranty. Thoughts?