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Old 08-02-12, 12:39 AM   #1
Peter86
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Rear Hub Buzz Gone

Hey,
Just after some help with my willier izoard... The rear hub started its life with a nice medium level buzz when coasting. However, the last few rides this sound has dulled and now it is almost non existent. Not so much worried about the sound, more curious as to whether this means any parts need changing. Also would the rolling resistance have changed at all...

Cheers!
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Old 08-02-12, 04:39 AM   #2
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Odd, sounds like you wanted the buzz and now that its gone, you are upset. I would be thrilled if my bike quieted down with break-in.

If the bike is functioning fine and nothing odd is occurring other than the annoying buzz is gone, I would attribute that to parts breaking in and be happy that the noise is gone.

How does the rear wheel feel when you spin it? Does the rear freehub slip at all when pedaling up hill?

If nothing is actually wrong, it should be a non-issue.
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Old 08-02-12, 05:32 AM   #3
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Thanks Bobo,
bike feels as smooth as it always has. My only concern is that the noise is meant to be there, it's that clicking sound from the hubs that occurs in some wheel types.. Now more curious as to what's caused the noise to "go missing"
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Old 08-02-12, 05:41 AM   #4
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What brand of hub?
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Old 08-02-12, 07:09 AM   #5
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If it does not slip at all then it's fine.
But it may tell that the springs are too loose, (or broken) and the sound it makes is almost gone, but this sort of problems usually cause slips where you pedal forward and it does not engage right-away.

It's not funny to remain in the middle of the road and cannot pedal at all. And being a non serviceable part on the road, check it thorough that it does not slip. (for a freehub it's ugly to mess it on the road, you need lockring tool, a large wrench a 10-12mm inbus (allen) key.. things you don't carry with you). On a freewheel is hardly serviceable just to get you home, with a flat screwdriver/punch and a rock or something to bash it, you can loosen the FW outer body, pull apart the cogs and get to the pawls and a gazillion tiny balls that run everywhere, but between a 30min job on the side road and a 20km walk it's doable with various options (making springs from rubber from a tube, or from a ballpen with that little spring, or if the pawls holders are cracked you can wedge some of those gazillion little balls and run it "fixed", but you have to shorten the chain or be VERY careful not to apply pressure backward at all as the shifter would be toast and the chain will fall with brutal consequences as the wheel keeps spinning with the chain wrapping around and torquing the chainstays, throwing the chain into the spokes, between frame and wheel, etc a lot of bad thing can happen on a fixed with derailleur). A cool kludge on a broken FW even freehub is to wrap zip-ties from the largest cog to the spokes making it somewhat fixed but still is terribly not advisable to run fixed with derailleur.

Again, just make sure your hub is not slipping as this is one of the few issues that can happen on the road and leave you stranded.
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Old 08-02-12, 08:06 AM   #6
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Where do you live? Has the climate cooled down at all? If so, then it could be that the grease inside the freehub body has thickened slightly due to the colder weather.
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Old 08-02-12, 08:24 AM   #7
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Shimano freehubs are nearly completely silent when coasting, Campy's are noisy and the more boutique hubs (DT, Chris King, etc) are distressingly loud. What make hubs are yours?
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Old 08-02-12, 02:36 PM   #8
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Thanks guys,
the hubs are fulcrums...and the weather has cooled down, and just moved house where my bike is now stored outside.. Temps only get to about 5deg Celsius though.. There is a little bit of slipping, not while changing gear, but mostly mid pedal...
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Old 08-02-12, 04:47 PM   #9
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Quote:
Originally Posted by Peter86 View Post
There is a little bit of slipping, not while changing gear, but mostly mid pedal...
That's a bad sign. I expect there is a problem either with the pawls themselves or their tension springs.
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Old 08-02-12, 06:01 PM   #10
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Quote:
Originally Posted by Peter86 View Post
Thanks guys,
the hubs are fulcrums...and the weather has cooled down, and just moved house where my bike is now stored outside.. Temps only get to about 5deg Celsius though.. There is a little bit of slipping, not while changing gear, but mostly mid pedal...
DO NOT store your bike outside, especially because it's carbon fiber. Bring it into your (presumably) heated house and let it warm up. Then check if it gets any louder.

Quote:
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That's a bad sign. I expect there is a problem either with the pawls themselves or their tension springs.
That's what I'm thinking. Probably combined with thicker grease due to temperature (as opposed to age).
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