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Low quality cog -- cause of excess noise?

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Low quality cog -- cause of excess noise?

Old 09-01-09, 10:13 PM
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leed
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Low quality cog -- cause of excess noise?

I tried to search around here and through google to find an answer to my question, but came up with nothing.

My question is, can a low-quality sprocket cause unusual geardrive noises that are unrelated to chainline?

If it helps, my chainring is flat (I checked that) and I've tested two chains (that are both under a few months old -- a KMC and a SRAM chain).

The cog is what came stock on a BWW wheelset (Formula hubs). Sorry if this question has been asked before and I couldn't find it. The cog is plain steel alongside the lockring. One other thing, the cog is also only a few months old (but I only recently started using it -- past month or so). When I was using a freewheel, it was (and still is) quieter, and the chainline was off.
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Old 09-01-09, 10:15 PM
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ShaneRidesBikes
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wuts the sound like?
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Old 09-01-09, 10:20 PM
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fwiw, my bike became completely silent after the addition of an EAI cog.
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Old 09-01-09, 10:22 PM
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leed
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Kind of like a whurring sound, I suppose. I'm not exactly sure how to describe it. One other thing, it's a 1/8th chain on a 1/8th cog, freewheel was 1/8th also.
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Old 09-01-09, 11:44 PM
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TejanoTrackie 
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Yes. A cheap stamped cog can cause all kings of meshing and rubbing noises, since the cavities between the teeth are uneven and rough. Also, the spacing between the teeth is not perfectly even. This problem does not occur with more expensive machined cogs. It will not be as noticeable with a 3/32 drivetrain. If it really bothers you, just replace it with a better quality machined cog like a Surley, Dura Ace etc.
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Old 09-01-09, 11:52 PM
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Originally Posted by TejanoTrackie View Post
Yes. A cheap stamped cog can cause all kings of meshing and rubbing noises, since the cavities between the teeth are uneven and rough. Also, the spacing between the teeth is not perfectly even. This problem does not occur with more expensive machined cogs. It will not be as noticeable with a 3/32 drivetrain. If it really bothers you, just replace it with a better quality machined cog like a Surley, Dura Ace etc.
This is very good to know. Many thanks!
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Old 09-02-09, 01:26 AM
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Whurring noise?

1. https://www.youtube.com/watch?v=e5UfCsTKbQY

2. https://www.youtube.com/watch?v=_DagaY8GYFw&NR=1

3. https://www.youtube.com/watch?v=Wz0FFZdSCmo

Mine sounds like 2.
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Old 09-02-09, 02:16 AM
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i've noticed my chain/drivetrain is much more quiet after applying lubricant. the ride seems smoother as well.
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