Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 11-01-12, 07:47 PM   #1
John Kelin
Member
Thread Starter
 
Join Date: Aug 2012
Bikes:
Posts: 33
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
shifter cable question

Hi all,

Iím having a little trouble changing the shifter cables on my bike.

I changed the front derailleur cable recently. Shifted to the small gear, removed the old cable, and threaded the new one through the right holes and guides. Cut the new housing to the same length as the old. I think I have all this right.

The problem came when I fastened the cable to the derailleur. I pulled the cable taut and tightened the clamp, and then turned the cranks to run through the gears. The derailleur wouldnít move the chain from the middle to the big gear (itís a triple chainring). Cable tension seemed a little loose, so I went to tighten it. That was when I noticed that the cable was already beginning to fray at the point where Iíd attached it to the clamp.

Removed the cable, tried another one. Same thing happened.

Obviously Iím doing something wrong.

Would over-tightening the clamp cause immediate fray to a new cable? Or maybe Iíve attached it wrong: thereís an outer part of the clamp, then a washer, and then the part I think of as the clampís base, against the derailleur itself. I had the cable between the washer and the base. Should it be between the washer and the outer part?

I donít know how well Iíve described this. And I don't know what the heck I'm doing wrong. Have checked the Sheldon Brown page but not found an answer. Any suggestions?
John Kelin is offline   Reply With Quote
Old 11-01-12, 08:24 PM   #2
cale
Senior Member
 
cale's Avatar
 
Join Date: Oct 2004
Location: Seattle
Bikes: Kuota Ksano. Litespeed T5 gravel - brilliant!
Posts: 3,250
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
The cable fits between the washer and the derailleur (not between the washer and the attachment bolt). If you look closely you will probably find a small indent/groove the cables will rest in. If you leave the cables untrimmed until you have finished your adjustment, you can avoid the premature fraying of the cable. (Also, don't over tighten the attachment bolt. It takes far less pressure than you might imagine just to hold the cables when you're making adjustments.)
cale is offline   Reply With Quote
Old 11-01-12, 08:44 PM   #3
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 28,917
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 95 Post(s)
There is a small "tab" outside of the cable fixing bolt. The cable has to be routed OVER this tab and then to the clamping bolt. It must not go between this tab and the bolt.
HillRider is offline   Reply With Quote
Old 11-01-12, 10:35 PM   #4
Turtle Speed
happy bike wishes
 
Turtle Speed's Avatar
 
Join Date: Jun 2012
Bikes:
Posts: 264
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Is this correct? This is a FD setup that runs along the top of the top tube and then down the seat tube. I saw that tab thingy on my FD and couldn't figure out what to do with it. I'd seen posts here saying the cable is supposed to loop around it some way, but I don't think I understand exactly how.



At least the cable is between the washer and the derailleur body? Someone wanna explain or draw a line on my photo showing which route the cable is supposed to be taking?
Attached Images
File Type: jpg FD 2.jpg (92.1 KB, 52 views)
Turtle Speed is offline   Reply With Quote
Old 11-02-12, 08:07 AM   #5
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 28,917
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 95 Post(s)
Well, your setup is a bit different, being a top pull. However, I believe you have the cable run backwards, that is the tag end should be to the outside of the bolt and the long run from the top tube should be inside of it. The way you have it reduces the derailleur travel and explains why you can't shift to the big ring. Overtightening the clamp bolt won't help or hinder shifting but it does crush the cable unnecessarily.
HillRider is offline   Reply With Quote
Old 11-02-12, 08:25 PM   #6
Turtle Speed
happy bike wishes
 
Turtle Speed's Avatar
 
Join Date: Jun 2012
Bikes:
Posts: 264
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thank you for the help, by the way. I am not the OP, and I can get my FD to the big chainring. I just always had a couple weird questions about my FD setup.


Quote:
Originally Posted by HillRider View Post
...the tag end...
Uh, just to make sure I have my terminology right, the tag end is the end with the little pinch cap thingy you put on?


Quote:
Originally Posted by HillRider View Post
...being a top pull... I believe you have the cable run backwards, that is the tag end should be to the outside of the bolt and the long run from the top tube should be inside of it.
I'm sorry, I just want to make sure I understand correctly. Should it be like this?



Would that be right? And if so, what exactly is the point of the tab on the FD? It wouldn't seem to be articulating with the cable at all.
Attached Images
File Type: jpg FD 3.jpg (91.1 KB, 25 views)
Turtle Speed is offline   Reply With Quote
Old 11-03-12, 05:40 AM   #7
cny-bikeman
Mechanic/Tourist
 
Join Date: Apr 2007
Location: Syracuse, NY
Bikes: 2008 Novara Randonee - love it. Would have more bikes if I had time to ride them all. Previous bikes: 1968 Motobecane Mirage, 1972 Moto Grand Jubilee (my fav), Jackson Rake 16, 1983 C'dale ST500.
Posts: 6,322
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 54 Post(s)
I'll have to admit I'm not familiar with the exact cable routing on that derailleur, and is appears to be a very early top pull, so not much to find in the way of examples on the web. I thought otherwise at first but looking closer at the 2nd pic it appears that routing would be correct. Make sure you have the cable positioned so as to be in the groove in either the washer or the derailleur face. Do not wrap the cable around the bolt/washer. Route it just to the one side, straight through, and then tighten. After the bolt is tightened you can bend the end of the cable inward. Wrapping it around actually provides a less secure mounting in addition to distorting the cable more.

Last edited by cny-bikeman; 11-03-12 at 08:51 AM.
cny-bikeman is offline   Reply With Quote
Old 11-03-12, 08:30 AM   #8
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 28,917
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 95 Post(s)
Quote:
Originally Posted by Turtle Speed View Post
Thank you for the help, by the way. I am not the OP, and I can get my FD to the big chainring. I just always had a couple weird questions about my FD setup.



Uh, just to make sure I have my terminology right, the tag end is the end with the little pinch cap thingy you put on?



I'm sorry, I just want to make sure I understand correctly. Should it be like this?


.

Would that be right? And if so, what exactly is the point of the tab on the FD? It wouldn't seem to be articulating with the cable at all.
Yes to both questions. The tab next to the clamping bolt is used as a cable guide with the more common bottom pull cable routing.

Also, cny-bikeman's recommendation to run the cable through in one direction only is a good one. cut off the excess and recap it.
HillRider is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 02:33 AM.