Dfly
new member
Reged: 08/22/07
Posts: 5
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Folks - I am seeking some advice here. I have begun riding a new bike (Calfee Dragonfly) and am experiencing something I have never had before. That is, when I am coasting, and particularly descending long hills, I hear this god-awful noise and often times, soon after the noise appears, my chain drops off the chainwheel  . In all cases, it only happens when I am not pedaling at all. Now, the noise sounds like some type of vibration, but so far I cannot pinpoint it. And, I am assuming it is somewhere in the drivechain - but realize it could be anywhere. However, I am curious as to what is making the chain come off the chainwheel. (It happens on large and small - I have a Stronglight Pulsion 50-34 compact.) I am often reaching quite high speeds on the long descents in hilly/mountainous areas and this noise / chanin drop is not all too pleasant to be hearing. Any ideas on what may be causing it and how to eliminate it? Thanks.
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dfcas
contributor
Reged: 12/19/03
Posts: 136
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Freehub drag. Put the bike in a repair stand or on a bike rack,spin up the crank,then release it.If the chain goes slack on the upper side,the freehub body is dragging.
What type of rear hub do you have?Don't answer American Classic please.
dan
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Dfly
new member
Reged: 08/22/07
Posts: 5
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Thanks - I will try your suggestion.
Close. Actually - I did have an American Classic (AC) 350 rim on the back and still have one on the front. I had to replace the rear rim (Mavic 33) since I broke a spoke on the AC 350 and it went all out of whack and could not be re-trued. However, the rear is a Zipp 215 hub; front is Zipp 100.
Can you enlighten me as to what you mean by the "freehub is dragging?" And what would I need to do to correct?
Thanks.
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dfcas
contributor
Reged: 12/19/03
Posts: 136
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When you coast,the freehub should spin freely.If it tries to turn along with the rim,it will try to turn the crank.Since your feet won'y let the crank turn,the chain gets pushed forward.
To repair it would depend on the design of the hub.Maybe new bearings or lubrication?I don't know that hub.
You may also susstitute a known good rear wheel and see if the problem goes away.
dan
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Dfly
new member
Reged: 08/22/07
Posts: 5
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Dan - that makes sense, as I come to think of it. The wheel was just rebuilt last week and only 200 miles on it. It would be appropriate to bring it back to LBS to check out. (I will verify the freehub drag in a few hours when I ride - currently in Spain.)
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davidlemon
friend
Reged: 09/21/06
Posts: 37
Loc: sacramento, ca
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Quote:
dfcas wrote:
What type of rear hub do you have? Don't answer American Classic please.
dan
must interject here. dan, i'm curious, can you elaborate on your comment re: american classic hubs? which generation and/or model hub are you directing your disdain towards and why? thanks.
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dfcas
contributor
Reged: 12/19/03
Posts: 136
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I recently had the same problem on an American Classic hub,so it would have been a strange coincidence.My hub was from 2000-2001 and had been overhauled several times,but the last time it seemed beyond help.
They have improved them several times since then I'm told.Mine was ridden daily for 5-6 years and therefore I feel I got my moneys worth out of it.
All this said,I think Campy or Shimano hubs are better than cartridge bearing hubs in my experience.
dan
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davidlemon
friend
Reged: 09/21/06
Posts: 37
Loc: sacramento, ca
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thanks, dan.
david
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