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 10-23-08, 01:51 PM   #1
ICycleALot
Newbie
Thread Starter
 
Join Date: Oct 2008
Bikes:
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Shimano STI Shifter - Cable Return Problem

My Specialized Allez is about 3 months old and has only a couple hundred miles on it, but those are miles on bumpy Boston city streets. The left shifter, which is a Shimano ST-4500 in the Tiagra groupset, seems to be not returning the cable at all. When I try to shift onto the larger chainring, the shifting lever just stops about halfway through its travel and the derailleur does as well.

The derailleur moves just fine, so it isn't a limit/cable tension issue. I can plainly see the head of the cable being slightly buried in the little window on the side of the shifter, and I understand the head should be plainly visible there.

For now, I've unhooked the cable and just limited out the derailleur so I can ride with the chain on the large ring. Ideally I'd like to fix this problem myself so that I don't have to be without transportation for too long. Does anyone have any experience with this kind of problem?

Thanks so much!
ICycleALot is offline   Reply With Quote
Old 10-23-08, 02:00 PM   #2
zacster
Senior Member
 
Join Date: Jul 2004
Location: Brooklyn NY
Bikes:
Posts: 4,978
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
I would just bring it in if the bike is that new. If the brifter is the problem you won't be able to fix it yourself, in fact the shop won't be able to either. Shimano brifters are not field servicable.
zacster is offline   Reply With Quote
Old 10-23-08, 02:02 PM   #3
zzyzx_xyzzy
headtube.
 
zzyzx_xyzzy's Avatar
 
Join Date: Sep 2008
Bikes:
Posts: 804
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Possible the cable is hung up inside, or there is gunk in the shifter. Removing/replacing the cable and flushing the innards with wd-40 or suchlike are good first steps.

Beyond that you're getting into disassembly, which is possible if you're careful (tip: on reassembly use a piece of dental floss to pull the end of the return spring in place), but finding replacement parts is hard.
zzyzx_xyzzy is offline   Reply With Quote
Old 10-23-08, 03:50 PM   #4
ogbigbird
Senior Member
 
Join Date: Sep 2008
Location: yreka, ca
Bikes: like 15. my favorite a 1951 schwinn spitfire cruiser. also have a 1959 amf roadmaster, 1962 jch deluxe cruiser among others.
Posts: 542
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
i must concure with the above. besides checking to see if the problem lies in the shifter cables/housings, also check to make sure your derailleurs are adjusted right. if the shop you got it from will look at it for you, as any good shop would follow up, i'd do that. and sad but true, shimano sti brifters are not user servicable, like prev. mentioned.
ogbigbird is offline   Reply With Quote
Old 10-25-08, 01:44 PM   #5
ICycleALot
Newbie
Thread Starter
 
Join Date: Oct 2008
Bikes:
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks a lot for your help, everyone. After taking off the rubber covering of the shifter, I took one look around in there and decided not to get involved. It's covered under warranty at my shop, so hopefully a replacement shifter is in order. I wonder what happened?
ICycleALot is offline   Reply With Quote
Old 10-26-08, 03:55 AM   #6
dsm iv tr
Neither rain, snow...
 
dsm iv tr's Avatar
 
Join Date: Sep 2004
Location: Toronto, Canada
Bikes:
Posts: 127
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by zzyzx_xyzzy View Post
Possible the cable is hung up inside, or there is gunk in the shifter. Removing/replacing the cable and flushing the innards with wd-40 or suchlike are good first steps.
+1.

Cables that tear themselves apart in any fashion are not fun to deal with.

I'd take the cable out, and try to operate the brifter cable-less, if you can, to pinpoint the issue to either the cable or the brifter.
dsm iv tr 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 05:34 PM.