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 08-06-08, 11:37 AM   #1
the scout
Senior Member
Thread Starter
 
Join Date: Oct 2006
Bikes:
Posts: 71
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Shimano Shifting Problem

I have a Shimano 105 triple set-up on a steel road bike.

It is 5 years old with about a total of 8000 miles.

Recently I cannot seem to be able to set it up right.

When I get a sweet change going up the gears it is tardy coming down. I then adjust to get going down right then the tardiness changes to going up.

I replace my change regularily and recently fitted a new Shimano Ultegra rear derailleur and a new Shimano middle chain ring as I use the middle ring 80% of the time.

This did not cure the problem.

Where do I go from here . Replace the cassette? It has 8000 miles on it (the same as the rest of the parts).

Replace the changers ? - (very expensive).

All suggestions gratefully received (please dont say change to Campag)
the scout is offline   Reply With Quote
Old 08-06-08, 11:42 AM   #2
DMF 
Elitist Troglodyte
 
DMF's Avatar
 
Join Date: Jun 2006
Location: Dallas
Bikes: 03 Raleigh Professional (steel)
Posts: 6,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Have you checked that the RD hanger is square to the wheel?
__________________
Stupidity got us into this mess - why can't it get us out?

- Will Rogers
DMF is offline   Reply With Quote
Old 08-06-08, 01:47 PM   #3
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)
More than likely you need new shift cables and cable housings. Always replace the housings when replacing the cables. Also try squirting copious quantities of WD40 into the shifter internal mechanisms.

Al
Al1943 is offline   Reply With Quote
Old 08-06-08, 02:22 PM   #4
DMF 
Elitist Troglodyte
 
DMF's Avatar
 
Join Date: Jun 2006
Location: Dallas
Bikes: 03 Raleigh Professional (steel)
Posts: 6,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
It really doesn't sound like a shifter problem. It sounds like the rear setup has a bias, as it would with a bent hanger, where the chain "wants" to move in a certain direction. You can counteract that with the barrel adjuster, but then the RD will be too far in the other direction and it will eventually move the chain. So my bet's on the hanger alignment.

But you could be right about the housing. 8000 mi on a housing is a lot. Offsetting a slow housing with the RD would have a similar effect to counteracting a bent hanger.
__________________
Stupidity got us into this mess - why can't it get us out?

- Will Rogers
DMF is offline   Reply With Quote
Old 08-06-08, 03:15 PM   #5
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)
Quote:
Originally Posted by DMF View Post
It really doesn't sound like a shifter problem. It sounds like the rear setup has a bias, as it would with a bent hanger, where the chain "wants" to move in a certain direction. You can counteract that with the barrel adjuster, but then the RD will be too far in the other direction and it will eventually move the chain. So my bet's on the hanger alignment.

But you could be right about the housing. 8000 mi on a housing is a lot. Offsetting a slow housing with the RD would have a similar effect to counteracting a bent hanger.
Yeah, you could be right.
Al1943 is offline   Reply With Quote
Old 08-06-08, 03:26 PM   #6
the scout
Senior Member
Thread Starter
 
Join Date: Oct 2006
Bikes:
Posts: 71
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
RD hanger is square and new cables fitted recently.
Dont understand housing do you mean shifters?
the scout is offline   Reply With Quote
Old 08-06-08, 04:26 PM   #7
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)
Quote:
Originally Posted by the scout View Post
RD hanger is square and new cables fitted recently.
Dont understand housing do you mean shifters?
Housing is the tubing that the cables run through. Dirt, water, and corrosion crude builds up inside the housings and causes excess friction. The excess friction ******* the derailleur function, especially when the cable is released from the shifter and pulled by the derailleur spring. The housings should always be replaced when the cables are replaced. The short housing just before the rear derailleur is especially vulnerable to dirt and water spray.

Al

Last edited by Al1943; 08-06-08 at 04:31 PM.
Al1943 is offline   Reply With Quote
Old 08-06-08, 10:45 PM   #8
rickowensis
Senior Member
 
Join Date: Apr 2007
Location: Nolensville, TN
Bikes: Nishiki Sport 10 spd, Trek 730 MultiTrack hybrid, 1987 Marin Muirwoods, Fuji MT-350, Fuji Sandblaster, Raleigh Sprite and several others
Posts: 141
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
+1 on housing replacement. ALWAYS replace housing and cable together. Roughly 90% of shifting issues are caused by cable/housing issues including correct routing.
rickowensis 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 06:58 AM.