A Cycling & bikes forum. CycleBanter.com

Go Back   Home » CycleBanter.com forum » rec.bicycles » Techniques
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

STI and cables



 
 
Thread Tools Display Modes
  #11  
Old August 11th 08, 07:21 PM posted to rec.bicycles.tech
Peter Cole[_2_]
external usenet poster
 
Posts: 4,572
Default STI and cables

wrote:
Help me, I am new to STI.

When replacing the cables should I get the non-stretch ones from
Aztec?

With my Dura Ace STI the chain clanks lightly when I am in big ring
and middle cog. It is adjusted properly for the limits. A knowledgable
friend recommended replacing the cables etc
I am looking at replacing the cassette, chain, and cables. Is this
all worthwhile?


STI, other than the shape of the shifter, isn't any different than any
other indexed shifting method -- IOW, there aren't any unique cable
requirements.

Why is it "clanking"? Are you sure the indexing is off? That's usually a
problem at the limits, not the middle sprocket. Is the chain trying to
jump gears, or is it skipping? Jumping gears is usually caused by
friction, when you get things perfect for crisp (initial) shifting, the
derailer drifts as more cable pulls out against the friction and starts
trying to jump into the next higher gear. If you take out that slack,
then the shifting gets vague as an upshift dances between gears before
settling down.

Skipping is usually a worn sprocket or stiff chain link. It's common to
wear out a middle sprocket, often well before the others.

Replacing the cable isn't expensive and a good idea to do perhaps yearly
to prevent on-road failure or frayed wire pieces from fouling the
brifter. Replacing the last loop of housing before the rear derailer
periodically is also a good preventative since it gets dirty. Another
source of friction and indexing problems is the ferrules and/or housing
ends.

If you don't know how old the rear derailer cable is, replace it. Check
the housing and ends for problems. Check the chain for stiff links and
excessive wear. Replace the chain if necessary, a new chain will skip
worse if the cassette is worn out. If all else fails, check the sprocket
teeth for excessive wear (hooked tooth profile). If you can't be sure
about wear, borrow a wheel.
Ads
  #12  
Old August 12th 08, 12:30 AM posted to rec.bicycles.tech
John Forrest Tomlinson
external usenet poster
 
Posts: 6,564
Default STI and cables

On Mon, 11 Aug 2008 09:41:43 -0700, "Mike Jacoubowsky"
wrote:

Slightly off-topic, but do you think the newer Shimano 7900 system, which
pulls a great amount of cable per shift, might have fewer cable breaking
issues? My thinking is that the larger the radius of the part that spools up
the cable, the less stress from having it wound up tightly.


That's possible.

To add to your recommendation about regular replacement, an
alternative or complimetary approach for riders capable of changing
their own cable is "replace at the slightest sign of trouble."

  #13  
Old August 12th 08, 12:32 AM posted to rec.bicycles.tech
John Forrest Tomlinson
external usenet poster
 
Posts: 6,564
Default STI and cables

On Mon, 11 Aug 2008 18:21:25 GMT, Peter Cole
wrote:

STI, other than the shape of the shifter, isn't any different than any
other indexed shifting method -- IOW, there aren't any unique cable
requirements.


Yeah, though a "problem" is that it's hard to see the spot where cable
typically fail, whereas with downtube shifters you will see (and often
feel it) if a single strand breaks.
  #14  
Old August 12th 08, 03:09 AM posted to rec.bicycles.tech
jim beam
external usenet poster
 
Posts: 5,758
Default STI and cables

Mike Jacoubowsky wrote:
Slightly off-topic, but do you think the newer Shimano 7900 system, which
pulls a great amount of cable per shift, might have fewer cable breaking
issues? My thinking is that the larger the radius of the part that spools up
the cable, the less stress from having it wound up tightly.


absolutely, yes.
  #15  
Old August 12th 08, 07:00 AM posted to rec.bicycles.tech
Mike Jacoubowsky
external usenet poster
 
Posts: 2,972
Default STI and cables

"John Forrest Tomlinson" wrote in message
...
On Mon, 11 Aug 2008 09:41:43 -0700, "Mike Jacoubowsky"
wrote:

Slightly off-topic, but do you think the newer Shimano 7900 system, which
pulls a great amount of cable per shift, might have fewer cable breaking
issues? My thinking is that the larger the radius of the part that spools
up
the cable, the less stress from having it wound up tightly.


That's possible.

To add to your recommendation about regular replacement, an
alternative or complimetary approach for riders capable of changing
their own cable is "replace at the slightest sign of trouble."


Yes, but there are so many things that can contribute to a "slightest sign
of trouble" while shifting. If someone really knows what they're looking for
(the bit about being able to shift to a larger cog/chainring but some
difficulty coming back down), then maybe. But in my experience, it doesn't
take long to go from one or two broken strands to a completely-failed cable.
Worse, sometimes a broken cable can be a nightmare to remove.

--Mike Jacoubowsky
Chain Reaction Bicycles
www.ChainReaction.com
Redwood City & Los Altos, CA USA


  #16  
Old August 12th 08, 10:09 AM posted to rec.bicycles.tech
John Forrest Tomlinson
external usenet poster
 
Posts: 6,564
Default STI and cables

On Mon, 11 Aug 2008 23:00:35 -0700, "Mike Jacoubowsky"
wrote:

Worse, sometimes a broken cable can be a nightmare to remove.


Sadly, I know this all too well.

  #17  
Old August 12th 08, 02:42 PM posted to rec.bicycles.tech
Qui si parla Campagnolo Qui si parla Campagnolo is offline
Banned
 
First recorded activity by CycleBanter: Jul 2006
Posts: 3,259
Default STI and cables

On Aug 11, 10:39*am, "Mike Jacoubowsky"
wrote:
With my Dura Ace STI the chain clanks lightly when I am in big ring
and middle cog. It is adjusted properly for the limits. A knowledgable
friend recommended replacing the cables etc
I am looking at replacing the cassette, chain, and cables. *Is this
all worthwhile?


I wouldn't bother with replacing the cables until they're broken.


A broken gear cable, on the "wrong" side of the hill, can really wreck a
ride. And the symptoms of a failing gear cable are so subtle they're rarely
recognized. The most-common is the ability to shift to a larger sprocket,
but reluctance for it to shift back down.

We don't replace gear cables often enough for our customers, because they
don't call attention to themselves. The timeline for the failure mode is
simply too short and rarely times itself just right for when it's in the
shop. That's why I think replacing them every 7k miles or so isn't such a
bad idea.

--Mike Jacoubowsky
Chain Reaction Bicycleswww.ChainReaction.com
Redwood City & Los Altos, CA USA


Agree. Cheap and easy fix to most shifting problems. Inner wire is
stainless, housing is not. rust, corrosion, general gunk both in the
housing and BB guide(change that every so often as well). We do der
cables and hoousing just about every delex tubeup. That along with a
new chain and bar tape, makes the bike 'seem' new.
  #18  
Old August 12th 08, 02:44 PM posted to rec.bicycles.tech
Qui si parla Campagnolo Qui si parla Campagnolo is offline
Banned
 
First recorded activity by CycleBanter: Jul 2006
Posts: 3,259
Default STI and cables

On Aug 11, 10:41*am, "Mike Jacoubowsky"
wrote:
Slightly off-topic, but do you think the newer Shimano 7900 system, which
pulls a great amount of cable per shift, might have fewer cable breaking
issues? My thinking is that the larger the radius of the part that spools up
the cable, the less stress from having it wound up tightly.

--Mike Jacoubowsky
Chain Reaction Bicycleswww.ChainReaction.com
Redwood City & Los Altos, CA USA


I'll bet but again slightly off topic, since the shimano boys and
girls talk to you. Is the 7900 STI compatible with 7800/7700
derailleurs? I have heard, yes, no, and yes to rear der. only. Same
for brakes, 7900 levers and earlier brakes, I have 'heard' yes, no,
sorta, and vice versa, 7900 brakes and older STI.
  #19  
Old August 12th 08, 02:54 PM posted to rec.bicycles.tech
David L. Johnson
external usenet poster
 
Posts: 1,048
Default STI and cables

wrote:
Help me, I am new to STI.

When replacing the cables should I get the non-stretch ones from
Aztec?


Those Aztec cable sheaths (a string of aluminum beads) look cool, but
cost way too much. They also don't get such great reviews.

Modern derailleur cable sheaths are all "non-stretch", and even older
ones can be made to work with some fiddling.

With my Dura Ace STI the chain clanks lightly when I am in big ring
and middle cog. It is adjusted properly for the limits. A knowledgable
friend recommended replacing the cables etc
I am looking at replacing the cassette, chain, and cables. Is this
all worthwhile?


Just adjusting the limits is not always enough. Shimano front
derailleurs are a bit fussy to adjust correctly. Some newer Shimano
levers have trim adjustments, which will help.

How worn is the chain? Check and replace if needed, but it won't
necessarily fix your noise problem. Adjustment will. Don't spend big
money replacing the cassette unless you know it's worn. You find that
out by replacing the chain. If the new chain skips on your "favorite"
sprocket, replace the cassette.

--

David L. Johnson

I believe that the motion picture is destined to revolutionize our
educational system and that in a few years it will supplant largely,
if not entirely, the use of textbooks
-- Thomas Edison, 1922
  #20  
Old August 12th 08, 02:57 PM posted to rec.bicycles.tech
David L. Johnson
external usenet poster
 
Posts: 1,048
Default STI and cables

Ben C wrote:

I wouldn't bother with replacing the cables until they're broken.


Um, replacing the cables _before_ they break seems to be a better idea.
Cables (the inner wire) are dirt cheap, and you depend upon them. Me,
I replace mine every winter. For $10, tops, it's one less thing to
worry about on a steep descent, or when you are 50 miles from home.

--

David L. Johnson

I believe that the motion picture is destined to revolutionize our
educational system and that in a few years it will supplant largely,
if not entirely, the use of textbooks
-- Thomas Edison, 1922
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
getting new cables Pat[_5_] General 6 February 19th 08 05:17 PM
Nokon cables Carl Sundquist Techniques 6 April 30th 07 08:05 AM
Cables Campag_nut Australia 6 March 29th 07 03:50 PM
End of cables soup UK 12 July 1st 05 08:32 PM
Pre-cutting cables Richard Bates UK 5 August 7th 03 08:29 PM


All times are GMT +1. The time now is 07:01 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 CycleBanter.com.
The comments are property of their posters.