In message <
[email protected]>, The 13th Man
<
[email protected]> writes
>Had my bike for 3 weeks now, it is an urban-hybrid 24-speed MTB. I seem to feel a vibration when
>using the higher gears (ie the last 3 cogs on the freewheel) when using the outer cog on the
>chain-wheel. Is this normal? I appreciate that you can't strictly use all 24 speeds (ie 8x3
>combinations) due to the way that it stretches the chain, but I can't understand why I should feel
>this vibration on the last 3 cogs whilst using the outer cog on the chainwheel.
I googled and found the following. Is this a description of your problem?
>From: Mike Jacoubowsky (
[email protected]) Subject: Re: Vibration through pulleys - cannot see the
>problem...
>
>
>View this article only Newsgroups: rec.bicycles.tech Date: 2002-04-18 16:18:05 PST
>
>
>Does this noise happen equally in all rear cogs? Could be that you're hearing (and feeling) chain
>rumble, which can sometimes be pronounced on the smaller cogs. Sometimes it's exacerbated by a
>klunky cassette mechanism, which can be found in wheels of the cheapest and most expensive
>variety. Most likely the pulleys aren't involved, since they engage the chain at a point of very
>low tension.
>
>Have you brought it into the shop and asked about it?
>
>--Mike-- Chain Reaction Bicycles
http://www.ChainReaction.com
>
>"George Waller" <
[email protected]> wrote in message
>
news:[email protected]...
>> I have a slight but noticeable vibration through the chain when
>cycling
>> accompanied by a slightly more pronounced chain noise... considering
>I have
>> Ultegra spec (Shimano 600) bike with under 500 miles on it I do not
>feel
>> this is should be. You can almost feel the chain vibrations through
>the
>> pedals and this is why at first I thought it was contact with the
>front
>> derailleur but it isn't - besides it is a more subtle version of that
>front
>> derailleur chain friction you can get when it is slightly out of
>alignment.
>> Inspecting the pulleys shows no obvious misalignment, adjusting cable tension makes no
>> difference, the cage appears undamaged and is
>hanging
>> parallel with the rear sprockets... but the problem definitely seems
>to be
>> emanating from the pulley end - it seems that the problem is
>introduced at
>> that point. I recently cleaned the chain and there are no obvious
>signs of
>> wear - all the teeth on respective pulleys and sprockets seem
>perfect. When
>> pedalling the cycle manually whilst bike on work stand it simply does
>not
>> feel as smooth as it ought to. Any ideas?
>>
>> George
>>
>>
>
>It's due for it's first month's service next week - is this likely to be ironed out then?
If it really is a problem I would expect them to sort it out for you on a new bike.
--
Michael MacClancy