Problem after fitting new chain

[James]

i recently got a new chain for my dawes discovery 201 hybrid (after finding out from this newsgroup
which chain to buy, cheers), managed to get it on ok but now have a problem... if the chain is on
one the smaller rear sprockets, it catches on side of the part which holds the top small cog (or
roller?) of the rear derailleur. if i push this cog outwards (away from bike) just slightly so that
the chain no longer touches and then push the pedals backwards to test, it goes fine. could anyone
please tell me what do i need to adjust to correct this?

thanks in advance.

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[Pete Biggs]

james wrote:
> i recently got a new chain for my dawes discovery 201 hybrid

[7-speed, previous chain: KMC Z51]

> (after finding out from this newsgroup which chain to buy, cheers),

Which one did you get?

> managed to get it on ok but now have a problem... if the chain is on one the smaller rear
> sprockets, it catches on side of the part which holds the top small cog (or roller?) of the rear
> derailleur. if i push this cog outwards (away from bike) just slightly so that the chain no longer
> touches and then push the pedals backwards to test, it goes fine. could anyone please tell me what
> do i need to adjust to correct this?

Assuming chain is threaded through cage properly, I don't know what could cause that if chain and
jockey wheels are of correct width.

I've x-posted this to rec.bicycles.tech to get some more answers for you.

~PB

[Zog The Undenia]

james wrote:
> i recently got a new chain for my dawes discovery 201 hybrid (after finding out from this
> newsgroup which chain to buy, cheers), managed to get it on ok but now have a problem... if the
> chain is on one the smaller rear sprockets, it catches on side of the part which holds the top
> small cog (or roller?) of the rear derailleur. if i push this cog outwards (away from bike) just
> slightly so that the chain no longer touches and then push the pedals backwards to test, it goes
> fine. could anyone please tell me what do i need to adjust to correct this?

You need to reduce the cable tension slightly using the hand adjuster on the derailleur (screw it
*into* the derailleur a quarter of a turn at a time - you can see the derailleur move as you do
this). The problem is not directly related to the new chain.

[James]

"james" <jh485@tremail.com> wrote in message news:<3ff244c8_2@corp.newsgroups.com>...
> i recently got a new chain... if the chain is on one the smaller rear sprockets, it catches on
> side of the part which holds the top small cog (or roller?) of the rear derailleur. if i push this
> cog outwards (away from bike) ...it goes fine. could anyone please tell me what do i need to
> adjust to correct this?

sounds like the limit stop (the grub screw which sets how far to the offside your derailleur can go)
needs slackening off a little. Rather than explain it myself, have a look at http://www.sheldonbrown.com/derailer-
adjustment.html#adjustment (the whole article is worth looking at but you want the section on Limit
Stop Screws)

best wishes james

[Dave Kahn]

"Pete Biggs" <pbiggmellon{remove_fruit}s2000@onetel.net.uk> wrote in message news:<bstsn6$1bsth$1@ID-144931.news.uni-berlin.de>...
> james wrote:

> > if the chain is on one the smaller rear sprockets, it catches on side of the part which holds
> > the top small cog (or roller?) of the rear derailleur.

> > if i push this cog outwards (away from bike) just slightly so that the chain no longer touches
> > and then push the pedals backwards to test, it goes fine. could anyone please tell me what do i
> > need to adjust to correct this?
>
> Assuming chain is threaded through cage properly, I don't know what could cause that if chain and
> jockey wheels are of correct width.

If I've visualised this correctly it sounds as though the derailleur is not perfectly aligned with
the sprockets. If you put the bike into the middle gear of the cassette and look from the back the
jockey wheels of the derailleur should be in perfect vertical alignment with the sprocket. There
should be a barrel-shaped adjuster that the cable goes through where it enters the derailleur. You
can turn this to adjust the derailleur's position. It sounds as though you need to turn it a click
or two clockwise when viewed from above.

--
Dave...

[Simon Brooke]

"james" <jh485@tremail.com> writes:

> i recently got a new chain for my dawes discovery 201 hybrid (after finding out from this
> newsgroup which chain to buy, cheers), managed to get it on ok but now have a problem... if the
> chain is on one the smaller rear sprockets, it catches on side of the part which holds the top
> small cog (or roller?) of the rear derailleur. if i push this cog outwards (away from bike) just
> slightly so that the chain no longer touches and then push the pedals backwards to test, it goes
> fine. could anyone please tell me what do i need to adjust to correct this?

Did you use a chain with a magic joining link? If so, is it only this link that catches, or is it
all the links? If not, is it just one link that catches, or all the links?

If it's just one link that catches, it's probable that either it's stiff (doesn't move freely) or
the rivet is sticking out too far one side. Either way a little _very_ _gentle_ work with a chain
tool will sort it. If you aren't confident with a chain tool take it to someone who is, but seven
speed chains are a *lot* easier than nine-speed ones. You could always practice on your old chain if
you haven't thrown it away.

If it's catching on all the links then it's an alignment problem - see other people's posts. A new
chain will be laterally stiffer than an old, worn one so it isn't particularly surprising that an
alignment problem should first be noticed when you change chain.

--
simon@jasmine.org.uk (Simon Brooke) http://www.jasmine.org.uk/~simon/

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<URL:http://www.woz.org/woz/cresponses/response03.html

[Pete Biggs]

Pete Biggs wrote:

>> managed to get it on ok but now have a problem... if the chain is on one the smaller rear
>> sprockets, it catches on side of the part which holds the top small cog (or roller?) of the rear
>> derailleur. if i push this cog outwards (away from bike) just slightly so that the chain no
>> longer touches and then push the pedals backwards to test, it goes fine. could anyone please tell
>> me what do i need to adjust to correct this?

I first interpreted that as chain rubbing against the derailleur cage on the inside because chain is
too wide or something like that. If that's not the case, the normal adjustments should sort it. See
http://sheldonbrown.com/derailer-adjustment.html

~PB