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July 15th, 2009


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11:42 pm - creak
My bike is making a noise I haven't debugged yet. It's a soft creak. I think the pitch is constant, and happens twice per full pedal revolution -- hard to say for sure because it's not very loud and I can't hear it when there's wind in my ears. It doesn't happen when I'm off the bike, holding the rear wheel up and spinning the pedals. It's not the seat post, either: still happens when I'm off the saddle. Or when I'm riding and take my feed off the pedals. When I lean forward against the handlebars, I can't hear it.

So this is probably drivetrain related, but the stack bolts are tight, and so are the cranks. And the rear axle bolts. The chain is new and recently lubed. What else can it be? Bottom bracket?

(I also thought front wheel somehow, but spinning that in the air there's no noise either -- and it's not clear to me why it would have such a relationship with the pedal rotation. Though that could be a fluke of not having other gain ratios?)
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(see my 7 | call my bluff)

Comments:


[User Picture]
From:cmm
Date:July 16th, 2009 04:36 am (UTC)
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if your bike has some kind of suspension, it might well be it.  otherwise, no idea.
[User Picture]
From:gaal
Date:July 16th, 2009 05:19 am (UTC)
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The saddle is sprung, but other than that no suspension. The noise continues when I'm out of the saddle though.
[User Picture]
From:bostonsteamer
Date:July 16th, 2009 07:01 pm (UTC)
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I had a hard-to-diagnose noise for a while. Turned out it was from where the handlebar connected to the headset. The connection was just a little loose.

Edited at 2009-07-16 07:02 pm (UTC)
[User Picture]
From:gaal
Date:July 16th, 2009 07:12 pm (UTC)
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I don't think it's that either -- I can hear the noise when riding hands-free.
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(Deleted comment)
[User Picture]
From:gaal
Date:November 8th, 2009 06:19 pm (UTC)
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No resolution yet. I now suspect it's related to the front wheel and not the drivetrain; there's one long creak (or two short ones) that happens about the time the valve is aimed at the back, at roughly a right angle from the ground. This only happens when there's load on the wheel. Reseating the axle in the fork didn't change anything, nor did strengthening the nuts.
[User Picture]
From:gaal
Date:November 8th, 2009 06:20 pm (UTC)
(Link)
Where is this Amit Levinson shop?
(Deleted comment)
[User Picture]
From:gaal
Date:November 8th, 2009 06:28 pm (UTC)
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Thanks for the tip!

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