Gear adjustment
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My chain came off three times during my ride today - once of
the small ring, and twice off the biggest cog. I've had some
problems with gear adjustment before - for a while, it
wouldn't change down from the second ring to the smallest,
but I adjusted one of the screws and it seemed to be sorted.
I've looked at the chain as it goes through the mech, and on
the top jockey wheel, it appears to kink every few teeth,
which explains the clicking noise I was hearing today (the
chain is tapping against the jockey-wheel cage.
So, what should I look at first? Which bit makes the chain
fall off inside? Front derailler? Rear derailler?
--
Keith Willoughby http://flat222.org/keith/
Speicherzugriffsfehler
"Keith Willoughby" <keith@flat222.org> wrote in message
news:87wu2bm8ql.fsf@flat222.dyndns.org...
> My chain came off three times during my ride today - once
> of the small ring, and twice off the biggest cog. I've had
> some problems with gear adjustment before - for a while,
> it wouldn't change down from the second ring to the
> smallest, but I adjusted one of the screws and it seemed
> to be sorted.
>
> I've looked at the chain as it goes through the mech, and
> on the top jockey wheel, it appears to kink every few
> teeth, which explains the clicking noise I was hearing
> today (the chain is tapping against the jockey-wheel cage.
>
> So, what should I look at first? Which bit makes the chain
> fall off inside? Front derailler? Rear derailler?
>
I think David Millar knows the answer ....
Keith Willoughby wrote:
> My chain came off three times during my ride today - once
> of the small ring, and twice off the biggest cog. I've had
> some problems with gear adjustment before - for a while,
> it wouldn't change down from the second ring to the
> smallest, but I adjusted one of the screws and it seemed
> to be sorted.
Cable tension is also important.
> I've looked at the chain as it goes through the mech, and
> on the top jockey wheel, it appears to kink every few
> teeth, which explains the clicking noise I was hearing
> today (the chain is tapping against the jockey-wheel cage.
I don't know what you mean by "kink" if the links aren't
stiff (check that). Chain rubbing cage can be a difficult
problem to solve. Sometimes it's because something is bent
(including the hanger: bit of frame mech attaches to),
sometimes you just have to live with a bit of it.
> So, what should I look at first? Which bit makes the chain
> fall off inside? Front derailler? Rear derailler?
Front for front, rear for rear! :-)
I think you've got all sorts of things to look at and tinker
with. Follow the advice here: http://sheldonbrown.com/derailer-
adjustment.html
~PB
Keith Willoughby wrote:
> My chain came off three times during my ride today - once
> of the small ring, and twice off the biggest cog. I've had
> some problems with gear adjustment before - for a while,
> it wouldn't change down from the second ring to the
> smallest, but I adjusted one of the screws and it seemed
> to be sorted.
>
> I've looked at the chain as it goes through the mech, and
> on the top jockey wheel, it appears to kink every few
> teeth, which explains the clicking noise I was hearing
> today (the chain is tapping against the jockey-wheel cage.
>
> So, what should I look at first? Which bit makes the chain
> fall off inside? Front derailler? Rear derailler?
Depends whether it fell off at the front or the back ;-)
From the description above, it looks like it fell off at
the front. So you need to adjust the stop screws on the
front derailleur.
The kinking every few teeth sounds like you've got some
stiff links in your chain, which would also increase the
chance of the chain coming off. If it's just one poorly
joined link then it might be worth having a fiddle with a
chain tool to try and get it right. If you've got several
links then it might mean you need to lube your chain a bit
better, or you might need a new chain.
--
Danny Colyer (the UK company has been laughed out of my
reply address)
<URL:http://www.speedy5.freeserve.co.uk/danny/> (http://www.speedy5.freeserve.co.uk/danny/) "He who
dares not offend cannot be honest." - Thomas Paine
elyob wrote:
> "Keith Willoughby" <keith@flat222.org> wrote in message
> news:87wu2bm8ql.fsf@flat222.dyndns.org...
>>
>> So, what should I look at first? Which bit makes the
>> chain fall off inside? Front derailler? Rear derailler?
>
> I think David Millar knows the answer ....
You think it's my team manager's fault, then?
--
Keith Willoughby http://flat222.org/keith/ "The catcher hits
for .318 and catches every day The pitcher puts religion
first and rests on holidays"
"Keith Willoughby" <keith@flat222.org> wrote in message
news:874qpfm5a2.fsf@flat222.dyndns.org...
> elyob wrote:
>
> > "Keith Willoughby" <keith@flat222.org> wrote in message
> > news:87wu2bm8ql.fsf@flat222.dyndns.org...
> >>
> >> So, what should I look at first? Which bit makes the
> >> chain fall off inside? Front derailler? Rear derailler?
> >
> > I think David Millar knows the answer ....
>
> You think it's my team manager's fault, then?
>
Only if you can flick your chain back on with a forefinger
at 25+mph ...
Pete Biggs wrote:
> Keith Willoughby wrote:
>> My chain came off three times during my ride today - once
>> of the small ring, and twice off the biggest cog. I've
>> had some problems with gear adjustment before - for a
>> while, it wouldn't change down from the second ring to
>> the smallest, but I adjusted one of the screws and it
>> seemed to be sorted.
>
> Cable tension is also important.
The front cable is pretty loose. You certainly wouldn't get
a note out of it if you plucked it.
>> I've looked at the chain as it goes through the mech,
>> and on the top jockey wheel, it appears to kink every
>> few teeth, which explains the clicking noise I was
>> hearing today (the chain is tapping against the jockey-
>> wheel cage.
>
> I don't know what you mean by "kink" if the links aren't
> stiff (check that).
OK, but it happens more often than once per chain
revolution.
When I say 'kink', I mean that the chain seems to move a mm
or so to the outside of the jockey cage, then back again.
> Chain rubbing cage can be a difficult problem to solve.
> Sometimes it's because something is bent (including the
> hanger: bit of frame mech attaches to), sometimes you just
> have to live with a bit of it.
>
>> So, what should I look at first? Which bit makes the
>> chain fall off inside? Front derailler? Rear derailler?
>
> Front for front, rear for rear! :-)
Hmm, ok. Both, then.
> I think you've got all sorts of things to look at and
> tinker with. Follow the advice here: http://sheldonbrown.com/derailer-
> adjustment.html
Cheers.
--
Keith Willoughby http://flat222.org/keith/ The sky is
falling
Danny Colyer wrote:
> Keith Willoughby wrote:
>> My chain came off three times during my ride today - once
>> of the small ring, and twice off the biggest cog. I've
>> had some problems with gear adjustment before - for a
>> while, it wouldn't change down from the second ring to
>> the smallest, but I adjusted one of the screws and it
>> seemed to be sorted. I've looked at the chain as it goes
>> through the mech, and on the top jockey wheel, it appears
>> to kink every few teeth, which explains the clicking
>> noise I was hearing today (the chain is tapping against
>> the jockey-wheel cage. So, what should I look at first?
>> Which bit makes the chain fall off inside? Front
>> derailler? Rear derailler?
>
> Depends whether it fell off at the front or the back ;-)
>
> From the description above, it looks like it fell off at
> the front. So you need to adjust the stop screws on the
> front derailleur.
It fell off at both. I was just wondering if that meant two
problems, or one problem with two results.
[...]
Cheers.
--
Keith Willoughby http://flat222.org/keith/ Freedom is
slavery
Keith Willoughby wrote:
> It fell off at both. I was just wondering if that meant
> two problems, or one problem with two results.
It's a fair enough question actually. Occasionally a problem
at the rear will trigger problems at the front, but it still
sounds like improvements could be made at both ends anyway.
Concentrate on getting each aspect working as well as
possible rather than worrying about the whole thing all the
time, is my (vague) advice.
~PB
Keith Willoughby <keith@flat222.org> wrote in message news:<87wu2bm8ql.fsf@flat222.dyndns.org>...
> My chain came off three times during my ride today - once
> of the small ring, and twice off the biggest cog. I've had
> some problems with gear adjustment before - for a while,
> it wouldn't change down from the second ring to the
> smallest, but I adjusted one of the screws and it seemed
> to be sorted.
>
> I've looked at the chain as it goes through the mech, and
> on the top jockey wheel, it appears to kink every few
> teeth, which explains the clicking noise I was hearing
> today (the chain is tapping against the jockey-wheel cage.
>
> So, what should I look at first? Which bit makes the chain
> fall off inside? Front derailler? Rear derailler?
I had the same kink/clicking noise after I had jammed the
chain against the sprockets after replacing the wheel. This
had bent over one of the teeth on the top jockey wheel of
the XT mech (they are quite soft) which was lifting the
chain each time the tooth came round. I straightened the
tooth (the top bit broke off) but I have not had any
changing/kink/clicking problems since.
in message <87wu2bm8ql.fsf@flat222.dyndns.org>, Keith Willoughby
('keith@flat222.org') wrote:
> My chain came off three times during my ride today - once
> of the small ring, and twice off the biggest cog. I've had
> some problems with gear adjustment before - for a while,
> it wouldn't change down from the second ring to the
> smallest, but I adjusted one of the screws and it seemed
> to be sorted.
>
> I've looked at the chain as it goes through the mech, and
> on the top jockey wheel, it appears to kink every few
> teeth, which explains the clicking noise I was hearing
> today (the chain is tapping against the jockey-wheel cage.
>
> So, what should I look at first? Which bit makes the chain
> fall off inside? Front derailler? Rear derailler?
Either. And falling off on the inside is not good news -
you can cause serious damage to your chain, wheel and
jockey arm. Both deraileurs have limit screws for each end
of their travel - these are what should prevent
overshifting your chain.
--
simon@jasmine.org.uk (Simon Brooke)
http://www.jasmine.org.uk/~simon/
Morning had broken, and I found when I looked that
we had run out of copper roove nails.
Simon Brooke wrote:
> Both deraileurs have limit screws for each end of their
> travel - these are what should prevent overshifting
> your chain.
...If angle of front derailleur is correct.
~PB
Joe Roach wrote:
> Keith Willoughby <keith@flat222.org> wrote in message
> news:<87wu2bm8ql.fsf@flat222.dyndns.org>...
>> My chain came off three times during my ride today - once
>> of the small ring, and twice off the biggest cog. I've
>> had some problems with gear adjustment before - for a
>> while, it wouldn't change down from the second ring to
>> the smallest, but I adjusted one of the screws and it
>> seemed to be sorted.
>>
>> I've looked at the chain as it goes through the mech,
>> and on the top jockey wheel, it appears to kink every
>> few teeth, which explains the clicking noise I was
>> hearing today (the chain is tapping against the jockey-
>> wheel cage.
>>
>> So, what should I look at first? Which bit makes the
>> chain fall off inside? Front derailler? Rear derailler?
>
> I had the same kink/clicking noise after I had jammed the
> chain against the sprockets after replacing the wheel.
> This had bent over one of the teeth on the top jockey
> wheel of the XT mech (they are quite soft) which was
> lifting the chain each time the tooth came round. I
> straightened the tooth (the top bit broke off) but I have
> not had any changing/kink/clicking problems since.
That sounds promising. Thanks.
--
Keith Willoughby http://flat222.org/keith/ The snow meant
for them falls on the roadway
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