Vibration on new bike

The 13th Man said:

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.

(The smallest three cogs, I take it)

Quoted message said:

Is this normal?

Not with all bikes, but I have felt a certain amount of this "vibration" in the top gears of a
mountain bike with a 42 outer chainring and a cassette with an 11 tooth top cog. Smaller sprockets
like these are less efficient than those on a traditional road bike. You may just be noticing the
different feel of this modern bike, if like me, you have been used to very different gears.

Quoted message said:

It's due for it's first month's service next week - is this likely to be ironed out then?

Nothing can be done about it in a simple service unless there's some obvious rubbing somewhere. A
different bottom bracket may help if the angle of the chain is bad, but it's unlikely that the bike
had an inappropriate one fitted in the first place.

A different brand of chain might possibly mate with the sprocket teeth better and work more
smoothly, or the existing chain and cogs may "bed in" somewhat after a few hundred miles. But unless
chronic, I would just live with it.

~PB

In message <[email hidden]>, The 13th Man
<[email hidden]> writes

Quoted message said:

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?

Quoted message said:

From: Mike Jacoubowsky ([email hidden]) 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 chainreaction.comchainreaction.comOpen ↗

"George Waller" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

I have a slight but noticeable vibration through the chain when

cycling

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accompanied by a slightly more pronounced chain noise... considering

I have

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Ultegra spec (Shimano 600) bike with under 500 miles on it I do not

feel

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this is should be. You can almost feel the chain vibrations through

the

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pedals and this is why at first I thought it was contact with the

front

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derailleur but it isn't - besides it is a more subtle version of that

front

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derailleur chain friction you can get when it is slightly out of

alignment.

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Inspecting the pulleys shows no obvious misalignment, adjusting cable tension makes no
difference, the cage appears undamaged and is

hanging

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parallel with the rear sprockets... but the problem definitely seems

to be

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emanating from the pulley end - it seems that the problem is

introduced at

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that point. I recently cleaned the chain and there are no obvious

signs of

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wear - all the teeth on respective pulleys and sprockets seem

perfect. When

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pedalling the cycle manually whilst bike on work stand it simply does

not

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feel as smooth as it ought to. Any ideas?

George

Quoted message said:

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

"The 13th Man" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Had my bike for 3 weeks now, it is an urban-hybrid 24-speed MTB. I seem

to

Quoted message said:

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

Quoted message said:

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

Quoted message said:

the chainwheel.

It's due for it's first month's service next week - is this likely to be ironed out then?

My new bike was like that. I soon decided it wasn't something I could fix by tweaking and wasn't
really bad enough to worry about and it settled down after less than 100 miles.

Andy

Andy <[email hidden]> wrote in message "]news:[email hidden]...

Quoted message said:

"The 13th Man" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Had my bike for 3 weeks now, it is an urban-hybrid 24-speed MTB. I seem

to

Quoted message said:

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

Quoted message said:

appreciate that you can't strictly use all 24 speeds (ie 8x3

combinations)

Quoted message said:

Quoted message said:

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

Quoted message said:

the chainwheel.

It's due for it's first month's service next week - is this likely to be ironed out then?

My new bike was like that. I soon decided it wasn't something I could fix by tweaking and wasn't
really bad enough to worry about and it settled

down

Quoted message said:

after less than 100 miles.

Andy

Could it be the chain rubbing on the bottom of the derailleur caused by an incorrectly set 'angle of
dangle' screw?

Probably not thinking about it, especially in the big ring when the derailleur is under more tension
from the chain. Oh well, I'm too tired to work this out tonight, sorry!!!!!!!!

--
Mark
______________________________________

"Just ask yourself: What would Scooby Doo?"