I've been riding my bike for awhile now and i just noticed that around 8-10k rpm i hear a ringing sound in my bike... it sounds like it's coming from the handle bars but i'm not to sure... then i thought it was my keys hitting the bar but that wasn't it... i was just wondering if anyone had that problem too... i'm sorry if this was posted already... just don't have that much time to look through all of the threads