After our WNY meet and eat last weekend , my wife commented to me as we were almost home that she thought she heard a noise from the rear wheel. So I quieted the stereo about 90 decibels and listened. Yup , definately a growl between 40-55 mph accel or decel. Not horrible but certainly noticeable. Feel nothing in the seat no roughness. Could be the tire howling a bit or internal. This is my 2nd RSV and its new with about 600 miles on it. I am positive my last one did not make this noise, although maybe I didn't hear it over the whine.......Any thoughts? (Fluids full , tire pressure is spot on, rear hub was not hot to the touch)