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Rear derailleur help



 
 
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  #1  
Old September 17th 18, 12:11 AM posted to rec.bicycles.tech
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Posts: 4
Default Rear derailleur help

I am trying to change the gearing on a beloved seventies 6/7 speed. I would like to use a 50-34 compact crankset but stick with a 6 or 7 speed freewheel in back so I don't have to change wheels and spread the frame. I need rear derailleur ideas that could handle a 30T capacity and a 28T rear cog. Do you have any suggestions? A website suggested the Campagnolo Veloce 10 speed derailleur, but when I tried this model, it doesn't work, even with substituting longer adjustment screws there was too much travel toward the spokes. Thanks.
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  #2  
Old September 17th 18, 12:37 AM posted to rec.bicycles.tech
AMuzi
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Posts: 9,724
Default Rear derailleur help

On 9/16/2018 6:11 PM, wrote:
I am trying to change the gearing on a beloved seventies 6/7 speed. I would like to use a 50-34 compact crankset but stick with a 6 or 7 speed freewheel in back so I don't have to change wheels and spread the frame. I need rear derailleur ideas that could handle a 30T capacity and a 28T rear cog. Do you have any suggestions? A website suggested the Campagnolo Veloce 10 speed derailleur, but when I tried this model, it doesn't work, even with substituting longer adjustment screws there was too much travel toward the spokes. Thanks.


With friction shifters a Veloce long cage should shift well.
You do need a longer low gear screw (m4x0.7) but you can
buy one for pennies at any hardware store.

Ensure derailleur is vertical (cage parallel to chainrings),
ensure chain length is adequate and then shift firmly with
your thumb like this:
http://www.yellowjersey.org/photosfr...t/gearchek.jpg
so you know absolutely that the chain will not shift off the
back of your low gear sprocket.

The low gear limit is the one on the left. You can see its
function by looking up from under the changer. Once the
shifter is adjusted properly, connect the gear wire. Have
another go, you just missed something.


--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


  #3  
Old September 17th 18, 08:58 PM posted to rec.bicycles.tech
[email protected]
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Posts: 256
Default Rear derailleur help

On Sunday, September 16, 2018 at 4:37:42 PM UTC-7, AMuzi wrote:
On 9/16/2018 6:11 PM, wrote:
I am trying to change the gearing on a beloved seventies 6/7 speed. I would like to use a 50-34 compact crankset but stick with a 6 or 7 speed freewheel in back so I don't have to change wheels and spread the frame. I need rear derailleur ideas that could handle a 30T capacity and a 28T rear cog.. Do you have any suggestions? A website suggested the Campagnolo Veloce 10 speed derailleur, but when I tried this model, it doesn't work, even with substituting longer adjustment screws there was too much travel toward the spokes. Thanks.


With friction shifters a Veloce long cage should shift well.
You do need a longer low gear screw (m4x0.7) but you can
buy one for pennies at any hardware store.

Ensure derailleur is vertical (cage parallel to chainrings),
ensure chain length is adequate and then shift firmly with
your thumb like this:
http://www.yellowjersey.org/photosfr...t/gearchek.jpg
so you know absolutely that the chain will not shift off the
back of your low gear sprocket.

The low gear limit is the one on the left. You can see its
function by looking up from under the changer. Once the
shifter is adjusted properly, connect the gear wire. Have
another go, you just missed something.


--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


Andrew, the springs that are supposed to hold the limit screws in place are likely not to be long enough. I have tried to use Blue Locktite but can't get it to work like the stuff on many factory parts. Looking at these parts it appears that you have to put a single drop of the blue onto the screw and to let it dry for about an hour before using it. But instead of getting a tighter screw fit the damn things always are way too tight. And it's hard to get a single drop at a time from the tube. Hard you got some hints about this?
  #4  
Old September 18th 18, 03:20 AM posted to rec.bicycles.tech
Frank Krygowski[_4_]
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Posts: 6,271
Default Rear derailleur help

On 9/17/2018 3:58 PM, wrote:
On Sunday, September 16, 2018 at 4:37:42 PM UTC-7, AMuzi wrote:
On 9/16/2018 6:11 PM,
wrote:
I am trying to change the gearing on a beloved seventies 6/7 speed. I would like to use a 50-34 compact crankset but stick with a 6 or 7 speed freewheel in back so I don't have to change wheels and spread the frame. I need rear derailleur ideas that could handle a 30T capacity and a 28T rear cog. Do you have any suggestions? A website suggested the Campagnolo Veloce 10 speed derailleur, but when I tried this model, it doesn't work, even with substituting longer adjustment screws there was too much travel toward the spokes. Thanks.


With friction shifters a Veloce long cage should shift well.
You do need a longer low gear screw (m4x0.7) but you can
buy one for pennies at any hardware store.

Ensure derailleur is vertical (cage parallel to chainrings),
ensure chain length is adequate and then shift firmly with
your thumb like this:
http://www.yellowjersey.org/photosfr...t/gearchek.jpg
so you know absolutely that the chain will not shift off the
back of your low gear sprocket.

The low gear limit is the one on the left. You can see its
function by looking up from under the changer. Once the
shifter is adjusted properly, connect the gear wire. Have
another go, you just missed something.


--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


Andrew, the springs that are supposed to hold the limit screws in place are likely not to be long enough. I have tried to use Blue Locktite but can't get it to work like the stuff on many factory parts. Looking at these parts it appears that you have to put a single drop of the blue onto the screw and to let it dry for about an hour before using it. But instead of getting a tighter screw fit the damn things always are way too tight. And it's hard to get a single drop at a time from the tube. Hard you got some hints about this?


I doubt very much that a drop of typical Loctite thread locker will ever
dry on a screw. As I understand things, it's an anaerobic adhesive, and
its solidification is triggered by the presence of metal ions AND the
absence of air. http://instantca.com/articles/anaerobic-adhesives/

Now Loctite has dozens of products, including many intended for
industrial use instead of consumer use. I don't doubt they make a
compound to pre-apply to screws that does turn solid. But that's not the
stuff normally sold in stores.

If you find out different, let me know.

--
- Frank Krygowski
  #5  
Old September 18th 18, 03:44 AM posted to rec.bicycles.tech
David Scheidt
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Posts: 1,268
Default Rear derailleur help

Frank Krygowski wrote:
:On 9/17/2018 3:58 PM, wrote:
: On Sunday, September 16, 2018 at 4:37:42 PM UTC-7, AMuzi wrote:
: On 9/16/2018 6:11 PM,
wrote:
: I am trying to change the gearing on a beloved seventies 6/7 speed. I would like to use a 50-34 compact crankset but stick with a 6 or 7 speed freewheel in back so I don't have to change wheels and spread the frame. I need rear derailleur ideas that could handle a 30T capacity and a 28T rear cog. Do you have any suggestions? A website suggested the Campagnolo Veloce 10 speed derailleur, but when I tried this model, it doesn't work, even with substituting longer adjustment screws there was too much travel toward the spokes. Thanks.
:
:
: With friction shifters a Veloce long cage should shift well.
: You do need a longer low gear screw (m4x0.7) but you can
: buy one for pennies at any hardware store.
:
: Ensure derailleur is vertical (cage parallel to chainrings),
: ensure chain length is adequate and then shift firmly with
: your thumb like this:
:
http://www.yellowjersey.org/photosfr...t/gearchek.jpg
: so you know absolutely that the chain will not shift off the
: back of your low gear sprocket.
:
: The low gear limit is the one on the left. You can see its
: function by looking up from under the changer. Once the
: shifter is adjusted properly, connect the gear wire. Have
: another go, you just missed something.
:
:
: --
: Andrew Muzi
: www.yellowjersey.org/
: Open every day since 1 April, 1971
:
: Andrew, the springs that are supposed to hold the limit screws in place are likely not to be long enough. I have tried to use Blue Locktite but can't get it to work like the stuff on many factory parts. Looking at these parts it appears that you have to put a single drop of the blue onto the screw and to let it dry for about an hour before using it. But instead of getting a tighter screw fit the damn things always are way too tight. And it's hard to get a single drop at a time from the tube. Hard you got some hints about this?
:

:I doubt very much that a drop of typical Loctite thread locker will ever
:dry on a screw. As I understand things, it's an anaerobic adhesive, and
:its solidification is triggered by the presence of metal ions AND the
:absence of air. http://instantca.com/articles/anaerobic-adhesives/

:Now Loctite has dozens of products, including many intended for
:industrial use instead of consumer use. I don't doubt they make a
:compound to pre-apply to screws that does turn solid. But that's not the
:stuff normally sold in stores.

:If you find out different, let me know.

No, you're right. The preapplied stuff is called 'Dri-loc'. It's not
really available outside of industrial sales channels, and not even
readily there (neitther mcmaster nor fastenal list it, for instance).
there's a pre assembly tape that's somewhat more available.

--
sig 95
  #6  
Old September 18th 18, 07:35 AM posted to rec.bicycles.tech
[email protected]
external usenet poster
 
Posts: 272
Default Rear derailleur help

On Monday, September 17, 2018 at 9:58:59 PM UTC+2, wrote:
On Sunday, September 16, 2018 at 4:37:42 PM UTC-7, AMuzi wrote:
On 9/16/2018 6:11 PM, wrote:
I am trying to change the gearing on a beloved seventies 6/7 speed. I would like to use a 50-34 compact crankset but stick with a 6 or 7 speed freewheel in back so I don't have to change wheels and spread the frame. I need rear derailleur ideas that could handle a 30T capacity and a 28T rear cog. Do you have any suggestions? A website suggested the Campagnolo Veloce 10 speed derailleur, but when I tried this model, it doesn't work, even with substituting longer adjustment screws there was too much travel toward the spokes. Thanks.


With friction shifters a Veloce long cage should shift well.
You do need a longer low gear screw (m4x0.7) but you can
buy one for pennies at any hardware store.

Ensure derailleur is vertical (cage parallel to chainrings),
ensure chain length is adequate and then shift firmly with
your thumb like this:
http://www.yellowjersey.org/photosfr...t/gearchek.jpg
so you know absolutely that the chain will not shift off the
back of your low gear sprocket.

The low gear limit is the one on the left. You can see its
function by looking up from under the changer. Once the
shifter is adjusted properly, connect the gear wire. Have
another go, you just missed something.


--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


Andrew, the springs that are supposed to hold the limit screws in place are likely not to be long enough. I have tried to use Blue Locktite but can't get it to work like the stuff on many factory parts. Looking at these parts it appears that you have to put a single drop of the blue onto the screw and to let it dry for about an hour before using it. But instead of getting a tighter screw fit the damn things always are way too tight. And it's hard to get a single drop at a time from the tube. Hard you got some hints about this?


Put on the Loctite 243 (blue stuff) and take a paper towel and wipe the access off. There only have to be some loctite in the valleys of threads of the screw. It doesn't dry/harden in open air, it only hardens when you put in the screw. Works well.

Lou
  #7  
Old September 18th 18, 02:58 PM posted to rec.bicycles.tech
AMuzi
external usenet poster
 
Posts: 9,724
Default Rear derailleur help

On 9/17/2018 9:20 PM, Frank Krygowski wrote:
On 9/17/2018 3:58 PM, wrote:
On Sunday, September 16, 2018 at 4:37:42 PM UTC-7, AMuzi
wrote:
On 9/16/2018 6:11 PM,
wrote:
I am trying to change the gearing on a beloved seventies
6/7 speed. I would like to use a 50-34 compact crankset
but stick with a 6 or 7 speed freewheel in back so I
don't have to change wheels and spread the frame. I need
rear derailleur ideas that could handle a 30T capacity
and a 28T rear cog. Do you have any suggestions? A
website suggested the Campagnolo Veloce 10 speed
derailleur, but when I tried this model, it doesn't
work, even with substituting longer adjustment screws
there was too much travel toward the spokes. Thanks.


With friction shifters a Veloce long cage should shift well.
You do need a longer low gear screw (m4x0.7) but you can
buy one for pennies at any hardware store.

Ensure derailleur is vertical (cage parallel to chainrings),
ensure chain length is adequate and then shift firmly with
your thumb like this:
http://www.yellowjersey.org/photosfr...t/gearchek.jpg
so you know absolutely that the chain will not shift off the
back of your low gear sprocket.

The low gear limit is the one on the left. You can see its
function by looking up from under the changer. Once the
shifter is adjusted properly, connect the gear wire. Have
another go, you just missed something.


--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


Andrew, the springs that are supposed to hold the limit
screws in place are likely not to be long enough. I have
tried to use Blue Locktite but can't get it to work like
the stuff on many factory parts. Looking at these parts it
appears that you have to put a single drop of the blue
onto the screw and to let it dry for about an hour before
using it. But instead of getting a tighter screw fit the
damn things always are way too tight. And it's hard to get
a single drop at a time from the tube. Hard you got some
hints about this?


I doubt very much that a drop of typical Loctite thread
locker will ever dry on a screw. As I understand things,
it's an anaerobic adhesive, and its solidification is
triggered by the presence of metal ions AND the absence of
air. http://instantca.com/articles/anaerobic-adhesives/

Now Loctite has dozens of products, including many intended
for industrial use instead of consumer use. I don't doubt
they make a compound to pre-apply to screws that does turn
solid. But that's not the stuff normally sold in stores.

If you find out different, let me know.


Yes, that's right.
In practice, a drop of Blue on a screw will set in a few
hours once the threads are engaged (anaerobic). Alternately
for a simple low-force application like gear limit screws, a
drop of tubular cement works as well. Either may be turned
later as needed.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


  #8  
Old September 18th 18, 10:32 PM posted to rec.bicycles.tech
James[_8_]
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Posts: 5,758
Default Rear derailleur help

On 18/09/18 23:58, AMuzi wrote:


Yes, that's right.
In practice, a drop of Blue on a screw will set in a few hours once the
threads are engaged (anaerobic). Alternately for a simple low-force
application like gear limit screws, a drop of tubular cement works as
well. Either may be turned later as needed.


I wonder whether a few wraps of cotton thread would have a similar effect?

--
JS
  #9  
Old September 18th 18, 11:27 PM posted to rec.bicycles.tech
[email protected]
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Posts: 256
Default Rear derailleur help

On Monday, September 17, 2018 at 7:44:25 PM UTC-7, David Scheidt wrote:
Frank Krygowski wrote:
:On 9/17/2018 3:58 PM, wrote:
: On Sunday, September 16, 2018 at 4:37:42 PM UTC-7, AMuzi wrote:
: On 9/16/2018 6:11 PM,
wrote:
: I am trying to change the gearing on a beloved seventies 6/7 speed. I would like to use a 50-34 compact crankset but stick with a 6 or 7 speed freewheel in back so I don't have to change wheels and spread the frame. I need rear derailleur ideas that could handle a 30T capacity and a 28T rear cog. Do you have any suggestions? A website suggested the Campagnolo Veloce 10 speed derailleur, but when I tried this model, it doesn't work, even with substituting longer adjustment screws there was too much travel toward the spokes. Thanks.
:
:
: With friction shifters a Veloce long cage should shift well.
: You do need a longer low gear screw (m4x0.7) but you can
: buy one for pennies at any hardware store.
:
: Ensure derailleur is vertical (cage parallel to chainrings),
: ensure chain length is adequate and then shift firmly with
: your thumb like this:
:
http://www.yellowjersey.org/photosfr...t/gearchek.jpg
: so you know absolutely that the chain will not shift off the
: back of your low gear sprocket.
:
: The low gear limit is the one on the left. You can see its
: function by looking up from under the changer. Once the
: shifter is adjusted properly, connect the gear wire. Have
: another go, you just missed something.
:
:
: --
: Andrew Muzi
: www.yellowjersey.org/
: Open every day since 1 April, 1971
:
: Andrew, the springs that are supposed to hold the limit screws in place are likely not to be long enough. I have tried to use Blue Locktite but can't get it to work like the stuff on many factory parts. Looking at these parts it appears that you have to put a single drop of the blue onto the screw and to let it dry for about an hour before using it. But instead of getting a tighter screw fit the damn things always are way too tight. And it's hard to get a single drop at a time from the tube. Hard you got some hints about this?
:

:I doubt very much that a drop of typical Loctite thread locker will ever
:dry on a screw. As I understand things, it's an anaerobic adhesive, and
:its solidification is triggered by the presence of metal ions AND the
:absence of air. http://instantca.com/articles/anaerobic-adhesives/

:Now Loctite has dozens of products, including many intended for
:industrial use instead of consumer use. I don't doubt they make a
:compound to pre-apply to screws that does turn solid. But that's not the
:stuff normally sold in stores.

:If you find out different, let me know.

No, you're right. The preapplied stuff is called 'Dri-loc'. It's not
really available outside of industrial sales channels, and not even
readily there (neitther mcmaster nor fastenal list it, for instance).
there's a pre assembly tape that's somewhat more available.


Now that's what I needed to know. Thanks David. I assumed that it was just red for the original and blue for the Dri-loc.
 




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