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 10-21-06, 06:25 PM   #1
cynergy
Senior Member
Thread Starter
 
Join Date: Oct 2006
Location: Granite State
Bikes: Trek 800, Cannondale M300
Posts: 224
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
front Derailleur adjustment

Hi All,

I am new to bike maintainance. I recently tuned up my Trek 800 mountain bike. I went to the Park Tools website and read their reference notes on adjusting the derailleurs. My bike derailleurs now seem a lot more responsive. However, when I did a test run, I noticed one problem. The front derailleur has difficulty downshifting from the large chainring to a smaller chainring if I am riding up a steep hill (with lots of torque on the crankshaft). When I am riding on a flat surface, I do not have any problems shifting with the front derailleur.

Is this a problem due to overtension in the front derailleur gear shift cable? Or is this a problem due to the adjustment of the front derailleur stop screws? How do I address this problem?

Thanks!
cynergy is offline   Reply With Quote
Old 10-21-06, 06:32 PM   #2
well biked 
biked well
 
well biked's Avatar
 
Join Date: Jul 2005
Bikes:
Posts: 7,065
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
You need to "soft pedal" when shifting. In other words, the problem you're experiencing is most likely caused by "lots of torque on the crankshaft" as you say. When shifting, ease up on the torque, even though you keep the pedals moving............and as I believe Ned Overend once said: the front derailleur is the weak link on a bicycle, use it as seldom as possible.......Or something like that........I'll add that, since you've already utilized the excellent instructions on the Park Tool site, if you've got a barrel adjuster for the front derailleur you might try turning it clockwise just a bit to loosen the cable tension a little. That will make downshifting with the front derailleur a little more responsive. But mostly, "soft pedal" when shifting-

Last edited by well biked; 10-21-06 at 06:46 PM.
well biked is offline   Reply With Quote
Old 10-22-06, 07:07 PM   #3
cynergy
Senior Member
Thread Starter
 
Join Date: Oct 2006
Location: Granite State
Bikes: Trek 800, Cannondale M300
Posts: 224
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
well biked - thanks for the advice. i adjusted the cable tesnions using the barrel adjuster (decreased the tension a little) and it is much more responsive now downshifting.

My bike feels like it's brand new. It's 12 years old, and I haven't had it serviced in a long time. I decided to buy a repair stand and now have been doing all of my own repairs/maintenance. Having a good quality repair stand has really made it much easier to work on my bike.

Thanks again for the help!
cynergy 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 03:42 AM.