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Sounds like a wheel bearing issue? If it continues even when you're not pedaling, that's where I would look. Or rubbing between some part of the wheel and another fixed component.
EDIT... I guess I didn't read the full post. Does the period of the vibration correspond to the RPM of the rear wheel? Maybe it is badly unbalanced?
Last edited by MesiJezi; 08-15-2017 at 04:43 PM.
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