Guy brings me a bike to check out. A Specialized Sirrus from
about 2014 8 speed DT. Says the derailleur was rattling and
shifting on its own at times. I put in on the stand and it
seemed to shift ok really/ He need the back wheel trued also
and was really a wobble.
I ask him if he did anything and he said he did go home and
clean and lubed the chain. The chain look pretty clean too.
So I managed to get the wheel trued and it is pretty decent
not like truing a precise road machine with expensive wheels
but it is fine.
I then cleaned the chain good again and adjust the back V
brakes. Was a bit off but now they are even on both side. I
lubed some point of contact in the brakes at the frame and
then clean the rear derailleur. I then drop some lube at the
pivots on the RD.
I made absolutely no adjustment to the RD. I did make a very
small FD adjustment to take out some rub on the big cog in
front in the middle ring when in the small rear.
Right now on the stand the bike shifts perfectly in all
combinations and quite good I might add. So do you think
what this guts problem was all along a dirty non-lubed
chain? I know if things not lubed it will shift funny is
ghost shifting a product of dry chain? In the end ghost
shifting suggest to me much more problems but frankly I had
this back working in 20 minutes.
Guy brings me a bike to check out. A Specialized Sirrus from about 2014
8 speed DT. Says the derailleur was rattling and shifting on its own at times. I put in on the stand and it seemed to shift ok really/ He need
the back wheel trued also and was really a wobble.
I ask him if he did anything and he said he did go home and clean and
lubed the chain. The chain look pretty clean too. So I managed to get
the wheel trued and it is pretty decent not like truing a precise road machine with expensive wheels but it is fine.
I then cleaned the chain good again and adjust the back V brakes. Was a
bit off but now they are even on both side. I lubed some point of
contact in the brakes at the frame and then clean the rear derailleur. I
then drop some lube at the pivots on the RD.
I made absolutely no adjustment to the RD. I did make a very small FD adjustment to take out some rub on the big cog in front in the middle
ring when in the small rear.
Right now on the stand the bike shifts perfectly in all combinations and quite good I might add. So do you think what this guts problem was all
along a dirty non-lubed chain? I know if things not lubed it will shift
funny is ghost shifting a product of dry chain? In the end ghost
shifting suggest to me much more problems but frankly I had this back
working in 20 minutes.
On 5/14/2025 2:47 PM, Mark J cleary wrote:
Guy brings me a bike to check out. A Specialized Sirrus
from about 2014 8 speed DT. Says the derailleur was
rattling and shifting on its own at times. I put in on the
stand and it seemed to shift ok really/ He need the back
wheel trued also and was really a wobble.
I ask him if he did anything and he said he did go home
and clean and lubed the chain. The chain look pretty clean
too. So I managed to get the wheel trued and it is pretty
decent not like truing a precise road machine with
expensive wheels but it is fine.
I then cleaned the chain good again and adjust the back V
brakes. Was a bit off but now they are even on both side.
I lubed some point of contact in the brakes at the frame
and then clean the rear derailleur. I then drop some lube
at the pivots on the RD.
I made absolutely no adjustment to the RD. I did make a
very small FD adjustment to take out some rub on the big
cog in front in the middle ring when in the small rear.
Right now on the stand the bike shifts perfectly in all
combinations and quite good I might add. So do you think
what this guts problem was all along a dirty non-lubed
chain? I know if things not lubed it will shift funny is
ghost shifting a product of dry chain? In the end ghost
shifting suggest to me much more problems but frankly I
had this back working in 20 minutes.
Did you take it for a test ride? I can't tell you how many
times I went through "it worked great on the stand".
The phrases 'derailleur rattle' and 'chain rattle' are
usually descriptors for chain misalignment by people with
limited mechanical knowledge. Couple that with 'shifting on
its own' and you have the classic maladjusted indexing - he
may have been mistaking the 'rattle' for the chain
misalignment and the 'shifting on its own' when the
misalignment cause the chain to jump onto the next cog.
You seem to have that part of it figured out, but on the
outside chance that there is some issue with frame flex when
the frame is under load you might not see it until you take
it for a spin.
On 5/14/2025 1:47 PM, Mark J cleary wrote:
Guy brings me a bike to check out. A Specialized Sirrus from about
2014 8 speed DT. Says the derailleur was rattling and shifting on its
own at times. I put in on the stand and it seemed to shift ok really/
He need the back wheel trued also and was really a wobble.
I ask him if he did anything and he said he did go home and clean and
lubed the chain. The chain look pretty clean too. So I managed to get
the wheel trued and it is pretty decent not like truing a precise road
machine with expensive wheels but it is fine.
I then cleaned the chain good again and adjust the back V brakes. Was
a bit off but now they are even on both side. I lubed some point of
contact in the brakes at the frame and then clean the rear derailleur.
I then drop some lube at the pivots on the RD.
I made absolutely no adjustment to the RD. I did make a very small FD
adjustment to take out some rub on the big cog in front in the middle
ring when in the small rear.
Right now on the stand the bike shifts perfectly in all combinations
and quite good I might add. So do you think what this guts problem was
all along a dirty non-lubed chain? I know if things not lubed it will
shift funny is ghost shifting a product of dry chain? In the end ghost
shifting suggest to me much more problems but frankly I had this back
working in 20 minutes.
V brakes do not move on the frame post. The pivot is inside the arm.
Some models can be lubricated easily and some cannot.
Did you check that the cassette sprockets are tight on the body? A loose cassette lockring will give randomly sloppy shifts.
Is the rear changer straight? Get your head behind it and sight the chainrings. A vertical line through the pulleys should match one
through the chainrings.
Did you ride it? There are some things which are not obvious in mid air.
On 5/14/2025 1:47 PM, Mark J cleary wrote:
Guy brings me a bike to check out. A Specialized Sirrus from about
2014 8 speed DT. Says the derailleur was rattling and shifting on its
own at times. I put in on the stand and it seemed to shift ok really/
He need the back wheel trued also and was really a wobble.
I ask him if he did anything and he said he did go home and clean and
lubed the chain. The chain look pretty clean too. So I managed to get
the wheel trued and it is pretty decent not like truing a precise road
machine with expensive wheels but it is fine.
I then cleaned the chain good again and adjust the back V brakes. Was
a bit off but now they are even on both side. I lubed some point of
contact in the brakes at the frame and then clean the rear derailleur.
I then drop some lube at the pivots on the RD.
I made absolutely no adjustment to the RD. I did make a very small FD
adjustment to take out some rub on the big cog in front in the middle
ring when in the small rear.
Right now on the stand the bike shifts perfectly in all combinations
and quite good I might add. So do you think what this guts problem was
all along a dirty non-lubed chain? I know if things not lubed it will
shift funny is ghost shifting a product of dry chain? In the end ghost
shifting suggest to me much more problems but frankly I had this back
working in 20 minutes.
V brakes do not move on the frame post. The pivot is inside the arm.
Some models can be lubricated easily and some cannot.
Did you check that the cassette sprockets are tight on the body? A loose cassette lockring will give randomly sloppy shifts.
Is the rear changer straight? Get your head behind it and sight the chainrings. A vertical line through the pulleys should match one
through the chainrings.
Did you ride it? There are some things which are not obvious in mid air.
On 5/14/2025 1:47 PM, Mark J cleary wrote:
Guy brings me a bike to check out. A Specialized Sirrus from
about 2014 8 speed DT. Says the derailleur was rattling and
shifting on its own at times. I put in on the stand and it
seemed to shift ok really/ He need the back wheel trued also
and was really a wobble.
I ask him if he did anything and he said he did go home and
clean and lubed the chain. The chain look pretty clean too.
So I managed to get the wheel trued and it is pretty decent
not like truing a precise road machine with expensive wheels
but it is fine.
I then cleaned the chain good again and adjust the back V
brakes. Was a bit off but now they are even on both side. I
lubed some point of contact in the brakes at the frame and
then clean the rear derailleur. I then drop some lube at the
pivots on the RD.
I made absolutely no adjustment to the RD. I did make a very
small FD adjustment to take out some rub on the big cog in
front in the middle ring when in the small rear.
Right now on the stand the bike shifts perfectly in all
combinations and quite good I might add. So do you think
what this guts problem was all along a dirty non-lubed
chain? I know if things not lubed it will shift funny is
ghost shifting a product of dry chain? In the end ghost
shifting suggest to me much more problems but frankly I had
this back working in 20 minutes.
V brakes do not move on the frame post. The pivot is inside
the arm. Some models can be lubricated easily and some cannot.
Did you check that the cassette sprockets are tight on the
body? A loose cassette lockring will give randomly sloppy
shifts.
Is the rear changer straight? Get your head behind it and
sight the chainrings. A vertical line through the pulleys
should match one through the chainrings.
Did you ride it? There are some things which are not
obvious in mid air.
On Wed, 14 May 2025 14:35:43 -0500, AMuzi <am@yellowjersey.org> wrote:Well the fellow came by and he road the bike. Shifted fine but he had a
On 5/14/2025 1:47 PM, Mark J cleary wrote:
Guy brings me a bike to check out. A Specialized Sirrus from
about 2014 8 speed DT. Says the derailleur was rattling and
shifting on its own at times. I put in on the stand and it
seemed to shift ok really/ He need the back wheel trued also
and was really a wobble.
I ask him if he did anything and he said he did go home and
clean and lubed the chain. The chain look pretty clean too.
So I managed to get the wheel trued and it is pretty decent
not like truing a precise road machine with expensive wheels
but it is fine.
I then cleaned the chain good again and adjust the back V
brakes. Was a bit off but now they are even on both side. I
lubed some point of contact in the brakes at the frame and
then clean the rear derailleur. I then drop some lube at the
pivots on the RD.
I made absolutely no adjustment to the RD. I did make a very
small FD adjustment to take out some rub on the big cog in
front in the middle ring when in the small rear.
Right now on the stand the bike shifts perfectly in all
combinations and quite good I might add. So do you think
what this guts problem was all along a dirty non-lubed
chain? I know if things not lubed it will shift funny is
ghost shifting a product of dry chain? In the end ghost
shifting suggest to me much more problems but frankly I had
this back working in 20 minutes.
V brakes do not move on the frame post. The pivot is inside
the arm. Some models can be lubricated easily and some cannot.
Did you check that the cassette sprockets are tight on the
body? A loose cassette lockring will give randomly sloppy
shifts.
Is the rear changer straight? Get your head behind it and
sight the chainrings. A vertical line through the pulleys
should match one through the chainrings.
Did you ride it? There are some things which are not
obvious in mid air.
+1 to that last one. Making changes on the work stand is often
followed by a stop a mile or two out on the next ride to get things
right.
--
C'est bon
Soloman
On 5/14/2025 3:53 PM, Catrike Ryder wrote:
On Wed, 14 May 2025 14:35:43 -0500, AMuzi <am@yellowjersey.org> wrote:Well the fellow came by and he road the bike. Shifted fine but he had a
On 5/14/2025 1:47 PM, Mark J cleary wrote:
Guy brings me a bike to check out. A Specialized Sirrus from
about 2014 8 speed DT. Says the derailleur was rattling and
shifting on its own at times. I put in on the stand and it
seemed to shift ok really/ He need the back wheel trued also
and was really a wobble.
I ask him if he did anything and he said he did go home and
clean and lubed the chain. The chain look pretty clean too.
So I managed to get the wheel trued and it is pretty decent
not like truing a precise road machine with expensive wheels
but it is fine.
I then cleaned the chain good again and adjust the back V
brakes. Was a bit off but now they are even on both side. I
lubed some point of contact in the brakes at the frame and
then clean the rear derailleur. I then drop some lube at the
pivots on the RD.
I made absolutely no adjustment to the RD. I did make a very
small FD adjustment to take out some rub on the big cog in
front in the middle ring when in the small rear.
Right now on the stand the bike shifts perfectly in all
combinations and quite good I might add. So do you think
what this guts problem was all along a dirty non-lubed
chain? I know if things not lubed it will shift funny is
ghost shifting a product of dry chain? In the end ghost
shifting suggest to me much more problems but frankly I had
this back working in 20 minutes.
V brakes do not move on the frame post. The pivot is inside
the arm. Some models can be lubricated easily and some cannot.
Did you check that the cassette sprockets are tight on the
body? A loose cassette lockring will give randomly sloppy
shifts.
Is the rear changer straight? Get your head behind it and
sight the chainrings. A vertical line through the pulleys
should match one through the chainrings.
Did you ride it? There are some things which are not
obvious in mid air.
+1 to that last one. Making changes on the work stand is often
followed by a stop a mile or two out on the next ride to get things
right.
--
C'est bon
Soloman
small rattle against the FD cage when in the middle front ring and
smallest cog. I road could here it. The fix which worked and noise was
to move the FR hanger so the cog was parallel with ring, plus a small
bit of fudge factor move out.
He test road it and it was silent. He was a happy guy. Really over not
much because it only had slight rub. The middle and small rear should be
a working gear. Funny thing was the small front and the small rear did
not rub as the cage gets slight wider down at the end. The small about
1mm move I made was the difference.
On 5/14/2025 3:53 PM, Catrike Ryder wrote:
+1 to that last one. Making changes on the work stand is often
followed by a stop a mile or two out on the next ride to
get things right.
He test road it and it was silent. He was a happy guy. Really
over not much because it only had slight rub. The middle and
small rear should be a working gear.
On Wed, 14 May 2025 16:36:58 -0500,
Mark J cleary <mcleary08@comcast.net> wrote:
On 5/14/2025 3:53 PM, Catrike Ryder wrote:
+1 to that last one. Making changes on the work stand is often
followed by a stop a mile or two out on the next ride to
get things right.
Yup.
He test road it and it was silent. He was a happy guy. Really
over not much because it only had slight rub. The middle and
small rear should be a working gear.
Just a minor comment on that last bit. On my tandem, the chain
doesn't like the two smallest cogs when on the middle ring.
Tracked this down to chainline, basically the chain comes into
contact with the inner side of the big ring and feints at shifting
to it. According to my tandem dealer, there's no simple fix to
this, so I just don't use those combinations.
On Wed, 14 May 2025 16:36:58 -0500,
Mark J cleary <mcleary08@comcast.net> wrote:
On 5/14/2025 3:53 PM, Catrike Ryder wrote:
+1 to that last one. Making changes on the work stand is often
followed by a stop a mile or two out on the next ride to
get things right.
Yup.
He test road it and it was silent. He was a happy guy. Really
over not much because it only had slight rub. The middle and
small rear should be a working gear.
Just a minor comment on that last bit. On my tandem, the chain
doesn't like the two smallest cogs when on the middle ring.
Tracked this down to chainline, basically the chain comes into
contact with the inner side of the big ring and feints at shifting
to it. According to my tandem dealer, there's no simple fix to
this, so I just don't use those combinations
On 5/15/2025 9:10 AM, Ted Heise wrote:
...On my tandem, the chain doesn't like the two smallest
cogs when on the middle ring. Tracked this down to chainline,
basically the chain comes into contact with the inner side of
the big ring and feints at shifting to it. According to my
tandem dealer, there's no simple fix to this, so I just don't
use those combinations
How much is the interference? If small, might it be possible to
use spacers to move the big ring a bit farther out? There might
be danger of dropping the chain between rings in a slow shift,
but it might be manageable.
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