Adjusting Front Derailleur?

Whiskey the Tat said:

Having trouble engaging the smallest cog on the front
chainring - rear mech all lined up and working fine. My
bike has a Tiagra groupset and I would just appreciate it
of someone knew which of the screws on this particular rig
will adjust the low gear limit? Sheldon's page assumes,
with caution, it's the one nearest to the frame but sod's
law.....so I want to be sure.

Also, looking down on the screws from the saddle is it a
clock or anti clock turn to 'encourage' the mech towards
the frame and therefore the chain in the lowest cog?

For info my bike is a Giant FCR2.

I have read other threads on the subject but am still a
bit unsure.

The page at

bike.shimano.comtech info b.aspOpen ↗
&pg=Tiagra

will have the info you need. You want the Service
Instructions for the particular model of derailleur, though
for the limit screws this shouldn't matter.

Regards,

-david

On Thu, 8 Apr 2004 16:35:34 +0000 (UTC), in
<[email hidden]>, "Whiskey the Tat"

Quoted message said:

Having trouble engaging the smallest cog on the front
chainring - rear mech all lined up and working fine. My
bike has a Tiagra groupset and I would just appreciate it
of someone knew which of the screws on this particular rig
will adjust the low gear limit? Sheldon's page assumes,
with caution, it's the one nearest to the frame but sod's
law.....so I want to be sure.

I don't know the answer since I don't have a Tiagra mech.
But if the mech allows you to see the mechanincs of what is
happening try engaging your shifters into small cog, and see
which of the two screws the mechanism is resting against.
Then work on the principle that if you withdraw this screw
away from the mech then it will allow more movement. If you
can't see the whole action, maybe you can see which screw is
in contact when the big ring is engaged? If this is the case
then you now need the OTHER screw.

There may also be a letter L (low) by the required screw
(compared with H for high).

Quoted message said:

Also, looking down on the screws from the saddle is it a
clock or anti clock turn to 'encourage' the mech towards
the frame and therefore the chain in the lowest cog?

I think "encourage" is the wrong word here. "Allow" would
be a better choice since this screw determines how much
the spring can relax and this pull the mech towards the
small ring.

Sorry I can't give a specific answer but hope this
helps anyway.

Love and screws from Rich x

--
When one is on a bicycle, all roads lead to roam.
www.artybee.net (same [censored], different layout)

Quoted message said:

Having trouble engaging the smallest cog on the front
chainring - rear

mech

Quoted message said:

all lined up and working fine. My bike has a Tiagra
groupset and I would just appreciate it of someone knew
which of the screws on this particular rig will adjust the
low gear limit?

This may not be the *easiest* way to check, but it should
sort your gears out nicely (I'm happy to be corrected by
anyone more expert than me).

Loosen the cable, so the mech springs into its 'lowest'
position. Then you can try fiddling with either screw and
see which one makes the mech move - this is the screw you're
after. Adjust this screw so that the mech is in the right
position for when the chain is on the small chainwheel. Then
pull the cable as tight as you can (make sure the shifter is
in the right position first) and tighten it up (you might
want a beautiful assistant on hand to pull the cable for you
while you tighten). Then shift up to the big chainring and
adjust the other screw accordingly.

Another point worth bearing in mind - I recently improved
the performance of my front mech by adjusting its position
to be much closer to the big chainwheel (about 1mm clearance
- it was more like 5mm before). Of course, this is not an
option if you have a braze-on mech.

d.

davek said:

Quoted message said:

Having trouble engaging the smallest cog on the front
chainring - rear mech all lined up and working fine. My
bike has a Tiagra groupset and I would just appreciate it
of someone knew which of the screws on this particular
rig will adjust the low gear limit?

This may not be the *easiest* way to check, but it should
sort your gears out nicely (I'm happy to be corrected by
anyone more expert than me).

Loosen the cable, so the mech springs into its 'lowest'
position. Then you can try fiddling with either screw and
see which one makes the mech move - this is the screw
you're after. Adjust this screw so that the mech is in the
right position for when the chain is on the small
chainwheel. Then pull the cable as tight as you can (make
sure the shifter is in the right position first) and
tighten it up (you might want a beautiful assistant on
hand to pull the cable for you while you tighten). Then
shift up to the big chainring and adjust the other screw
accordingly.

That'll work but it's not at all necessary if cable is
already ok. Instead, see manual to find out which screw is
which, or simply twiddle with them to see what they do and
what they feel like.

Tip for tightening cable when fitting front and rear mechs:
If you have a cable adjuster, screw it in (clockwise) all
the way in before attaching cable (and pull end of cable
with pliers), then there will be lots of scope to tighten
cable with adjuster afterwards.

Quoted message said:

Another point worth bearing in mind - I recently improved
the performance of my front mech by adjusting its position
to be much closer to the big chainwheel (about 1mm
clearance - it was more like 5mm before).

That's a good one.

Quoted message said:

Of course, this is not an option if you have a braze-
on mech.

It is, braze-on mechs aren't fixed in one position. The brazed-
on bracket has a curved slot on which the mech can be
adjusted up and down and in and out... a bit (usually enough
to get mech close to big ring).

~PB

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

Quoted message said:

davek said:

Quoted message said:

Having trouble engaging the smallest cog on the front
chainring - rear mech all lined up and working fine. My
bike has a Tiagra groupset and I would just appreciate
it of someone knew which of the screws on this
particular rig will adjust the low gear limit?

This may not be the *easiest* way to check, but it
should sort your gears out nicely (I'm happy to be
corrected by anyone more expert than me).

Loosen the cable, so the mech springs into its 'lowest'
position. Then you can try fiddling with either screw
and see which one makes the mech move - this is the
screw you're after. Adjust this screw so that the mech
is in the right position for when the chain is on the
small chainwheel. Then pull the cable as tight as you
can (make sure the shifter is in the right position
first) and tighten it up (you might want a beautiful
assistant on hand to pull the cable for you while you
tighten). Then shift up to the big chainring and adjust
the other screw accordingly.

That'll work but it's not at all necessary if cable is
already ok. Instead, see manual to find out which screw is
which, or simply twiddle with them to see what they do and
what they feel like.

Tip for tightening cable when fitting front and rear
mechs: If you have a cable adjuster, screw it in
(clockwise) all the way in before attaching cable (and
pull end of cable with pliers), then there will be lots of
scope to tighten cable with adjuster afterwards.

Quoted message said:

Another point worth bearing in mind - I recently
improved the performance of my front mech by adjusting
its position to be much closer to the big chainwheel
(about 1mm clearance - it was more like 5mm before).

That's a good one.

Shimano have a spec for this measurement, it is 0 - 0.5mm

--
Mike W

Quoted message said:

It is, braze-on mechs aren't fixed in one position.

Ah. I stand corrected.

d.