Soft Sounds = Big Danger
A soft, wheel-speed whoosh, whoosh got my attention today. Finally determined to be back wheel. Upon inspection I could find nothing except that the wheel was somewhat out of true, and the sound was coming from near the hub. That was the end of my mechanical ability to further define the problem.
Rode to the LBS (3 miles), and, upon close inspection, what do you think they found??
OK, guess away!!
Moral - never ignore those soft unexplained sounds - I believe this sound was caused by play in the spokes as they rubbed against each other. There were about 4 of these longitudinal cracks on the wheel. 30,000 miles and 10 years seems to be the limit!
It was fixed on-the-spot with a new wheel. However, I will never be able to match the red-rimmed original Mavic wheel!