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 01-03-10, 04:01 PM   #1
Copper1122
Senior Member
Thread Starter
 
Copper1122's Avatar
 
Join Date: Sep 2008
Location: Detroit, MI
Bikes:
Posts: 104
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Front Brifter Stuck

I have a compact double that I rarely ever shift. Living in South East Michigan, by biggest climbs are usually an e-way overpass. However, while cleaning my bike the other day, I found that my front brifter would stop moving aprox 1/4 of the way into the shift. I have an ultegra group and limited exp in indexed gearing repairs. Any thoughts on if this would be a relatively easy diagnosis and fix or should I just haul it over to the LBS?
Copper1122 is offline   Reply With Quote
Old 01-03-10, 04:02 PM   #2
Copper1122
Senior Member
Thread Starter
 
Copper1122's Avatar
 
Join Date: Sep 2008
Location: Detroit, MI
Bikes:
Posts: 104
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
BTW, I apologize if this is a recent repost. The new captcha on the search page pissed me off after 3 attempts and I said piss on it
Copper1122 is offline   Reply With Quote
Old 01-03-10, 04:05 PM   #3
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Copper1122 View Post
I have a compact double that I rarely ever shift. Living in South East Michigan, by biggest climbs are usually an e-way overpass. However, while cleaning my bike the other day, I found that my front brifter would stop moving aprox 1/4 of the way into the shift. I have an ultegra group and limited exp in indexed gearing repairs. Any thoughts on if this would be a relatively easy diagnosis and fix or should I just haul it over to the LBS?
First thing you want to do is check the condition of the cable. Pull it apart. It may be failing, or about to.
operator is offline   Reply With Quote
Old 01-03-10, 04:12 PM   #4
Copper1122
Senior Member
Thread Starter
 
Copper1122's Avatar
 
Join Date: Sep 2008
Location: Detroit, MI
Bikes:
Posts: 104
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I highly doubt its the cable. I didnt pull it apart yet, however, the group and cables have only about 200 miles on them. However, failure is always an option when dealing with mechanical parts
Copper1122 is offline   Reply With Quote
Old 01-03-10, 04:15 PM   #5
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Copper1122 View Post
I highly doubt its the cable. I didnt pull it apart yet, however, the group and cables have only about 200 miles on them. However, failure is always an option when dealing with mechanical parts
Just to doublecheck you are pedalling when trying to shift it right.
operator is offline   Reply With Quote
Old 01-03-10, 04:22 PM   #6
Copper1122
Senior Member
Thread Starter
 
Copper1122's Avatar
 
Join Date: Sep 2008
Location: Detroit, MI
Bikes:
Posts: 104
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yeah, I am. (I know, you have to ask) It just meets with solid resistance. Furthermore, I cant think of any event that has recently happened to cause failure.
Copper1122 is offline   Reply With Quote
Old 01-03-10, 04:28 PM   #7
bfree
Member
 
Join Date: Dec 2009
Bikes:
Posts: 47
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Another simple thing, but is the set screw in too tight?
bfree is offline   Reply With Quote
Old 01-03-10, 05:03 PM   #8
Copper1122
Senior Member
Thread Starter
 
Copper1122's Avatar
 
Join Date: Sep 2008
Location: Detroit, MI
Bikes:
Posts: 104
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Nah, the set screw is straight. It feels like something is stuck internally. And if that is the case, I know theres nothing to do but dig up the warranty paperwork and send the SOB back to shimano for a replacement.
Copper1122 is offline   Reply With Quote
Old 01-03-10, 05:10 PM   #9
San Rensho 
Senior Member
 
Join Date: Oct 2005
Bikes:
Posts: 5,540
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Grab the fron der cable where it runs along the bottom tube and pull it as you pedal the bike in a stand. If its shifts, its the brifter. Remember, brifters have trim stops, its not just big chainring/small chainring. Push the brifter lever twice to make sure you are not getting stuck on a trim stop.

If it shifts manually, first thing to do is check the cable tension. Cable on the small CR should be slack, but not sagging loose. To adjust, loosen the cable stop bolt, pull the cable through hand tight only and retighten cable stop bolt.

If the cable tension is properly adjusted and you still have the problem, then flush the insides of the brifter with solvent, WD40 works fine. The factory grease on brifters tends to solidify and prevent shifting.
__________________
Il faut de l'audace, encore de l'audace, toujours de l'audace

1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1
San Rensho is offline   Reply With Quote
Old 01-03-10, 05:20 PM   #10
Copper1122
Senior Member
Thread Starter
 
Copper1122's Avatar
 
Join Date: Sep 2008
Location: Detroit, MI
Bikes:
Posts: 104
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by San Rensho View Post
Grab the fron der cable where it runs along the bottom tube and pull it as you pedal the bike in a stand. If its shifts, its the brifter. Remember, brifters have trim stops, its not just big chainring/small chainring. Push the brifter lever twice to make sure you are not getting stuck on a trim stop.

If it shifts manually, first thing to do is check the cable tension. Cable on the small CR should be slack, but not sagging loose. To adjust, loosen the cable stop bolt, pull the cable through hand tight only and retighten cable stop bolt.

If the cable tension is properly adjusted and you still have the problem, then flush the insides of the brifter with solvent, WD40 works fine. The factory grease on brifters tends to solidify and prevent shifting.
Thanks for the diagnosing ideas. I'll give it a go on Thursday when I'm off
Copper1122 is offline   Reply With Quote
Old 01-03-10, 06:13 PM   #11
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: 28,776
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 36 Post(s)
The first thing I would do is disconnect the shift cable at the front derailleur and see if the cage will move over its entire range manually. If the derailleur moves smoothly, the problem is in the cable or brifter. If the derailleur gets stuck when not cabled up, then you've located the problem there.
HillRider is offline   Reply With Quote
Old 01-06-10, 11:34 PM   #12
Kimmo
bike whisperer
 
Kimmo's Avatar
 
Join Date: Dec 2009
Location: Melbourne, Oz
Bikes: copy/paste links: http://velospace.org/node/36949 http://velospace.org/node/47746 http://velospace.org/node/47747
Posts: 7,099
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by HillRider View Post
The first thing I would do is disconnect the shift cable at the front derailleur and see if the cage will move over its entire range manually. If the derailleur moves smoothly, the problem is in the cable or brifter. If the derailleur gets stuck when not cabled up, then you've located the problem there.
And if your shifter's still under warranty, piff it for another.

Overhauling one isn't an easy job.
Kimmo is offline   Reply With Quote
Old 01-07-10, 11:51 AM   #13
nitropowered
Senior Member
 
Join Date: Dec 2004
Location: Athens, Ohio
Bikes: Custom Custom Custom
Posts: 5,104
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by HillRider View Post
The first thing I would do is disconnect the shift cable at the front derailleur and see if the cage will move over its entire range manually. If the derailleur moves smoothly, the problem is in the cable or brifter. If the derailleur gets stuck when not cabled up, then you've located the problem there.
why not just yank on the cable? its easier to do it this way.

Another think is the cable head may have come dislodged inside the shifter.
nitropowered is offline   Reply With Quote
Old 01-07-10, 03:03 PM   #14
Al1943
Senior Member
 
Join Date: Feb 2005
Location: Oklahoma
Bikes: Trek 5500, Colnago C-50
Posts: 9,433
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
First try shooting the shifter full of WD40, this has solved lots of STI problems.

Al
Al1943 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 10:29 AM.