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Discussion Starter #1
I was riding into work today ,and was about half an hour in, when a loud high pitched hum started. It sounded like when the wind catches your helmet wrong, except it was coming from the bike and didn't really change pitch when I slowed down. The sound does drop in pitch below about 20mph, and goes away when idle. It doesn't come back when I rev, only when moving. Any ideas?
 
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