06-03-2012, 03:26 PM
I have an Electra Townie 21 with less than 600 miles on it. I clean and lub the chain often. The hub is a Shimano MegaRange Super low 14-34T. About 50 miles ago, an intermittent metallic clacking started coming from the rear hub. Like metal hammering on metal. It would continue during freewheeling or back peddling and the rate increased with speed. It has become progressively louder but still intermittent. A tack-tackity tack-tack repeated. But, it may almost go away on a 5 mile ride or return with a vengeance or it may be there the whole ride, staying loud or getting louder or quieter. I recorded the sound holding a small digital recorder toward the hub. It sounds like a metal striking metal.
The local shop service guy put it on a stand but there was no noise. After a ride, he told me his bike did the same thing and dismissed my concerns. I wondered if it could be a bearing going bad, with the race getting stuck and releasing intermittently. But he told me the bike isn't old enough? My confidence in his assessment is sorely lacking. It is definitely not normal.
When I click on "Add an Attachment" to upload a short m3 of the noise, this window is kicked back to the top but offers no way to add an attachment. It says I'm 'currently using N/A of your allocated attachment usage (Unlimited)'. I have no previous attachments. Does N/A mean not allowed?
A short mp3 of the sound might allow someone to diagnose the problem.
Thanks,
Max
The local shop service guy put it on a stand but there was no noise. After a ride, he told me his bike did the same thing and dismissed my concerns. I wondered if it could be a bearing going bad, with the race getting stuck and releasing intermittently. But he told me the bike isn't old enough? My confidence in his assessment is sorely lacking. It is definitely not normal.
When I click on "Add an Attachment" to upload a short m3 of the noise, this window is kicked back to the top but offers no way to add an attachment. It says I'm 'currently using N/A of your allocated attachment usage (Unlimited)'. I have no previous attachments. Does N/A mean not allowed?
A short mp3 of the sound might allow someone to diagnose the problem.
Thanks,
Max