Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take Part in the March Giveaway: Coming Soon 3/24


Front Derailluer shift isue
#1
I recently picked up an old Fuji road bike that I'm fixing up for a non-profit group. The components are all in good shape except for trouble shifting on the front derailleur.

The FD is a SunTour Compe-V running 2s and the chain gets caught between the high gear and derailleur arm causing it to seize forward pedaling. I've run it a few times in a trainer and 3 out of 10 times it shifted correctly. As far as I can tell it's in a good position. Any suggestions?
  Reply
#2
Check height (should be only 2-3 mm above the outer chainring) and that it is parallel to the chainrings.

Also try to tell if the derailleur cage has been bent out of shape. That could have happened if it jammed under force. If so, that could be making it jam easier. Try to bend back into shape or you may have to replace.
  Reply
#3
(09-07-2011, 06:15 PM)DaveM Wrote:  Check height (should be only 2-3 mm above the outer chainring) and that it is parallel to the chainrings.

Also try to tell if the derailleur cage has been bent out of shape. That could have happened if it jammed under force. If so, that could be making it jam easier. Try to bend back into shape or you may have to replace.

After looking over the positioning, I discovered the problem. There is a groove worn into the cage as if the chain were rubbing against it constantly on the inner chainring. There's enough of a lip that it prevents the chain from rising to the outer thus locking it. Best to just replace it then.
  Reply
#4
what size clamp do you need? might have one around I will give ya
There are two kinds of people in the world, "Those who help themselves to people, and those who help people!"
  Reply
#5
(09-08-2011, 07:58 PM)painkiller Wrote:  what size clamp do you need? might have one around I will give ya

Thanks for the offer. I'm going to try and file the cage to a smooth and level surface. I have a replacement derailleur set if that doesn't work.
  Reply


Possibly Related Threads...

Forum Jump:

[-]
10 Latest Posts
What tools have you bought recently?
Yesterday 06:57 PM
Santini fluted frame
Yesterday 06:47 PM
Expensive bikes with crappy wheels
Yesterday 10:15 AM
Where are you from and What is your favo...
03-27-2024 11:43 PM
2007 Trek Pilot S.P.A. 5.2
03-27-2024 07:06 PM
2010 Specialized Hardrock
03-26-2024 09:16 PM
1990 Specialized Rockhopper How to Fluff...
03-25-2024 07:05 PM
Thread busted on right pedal crank
03-24-2024 08:52 PM
Trek domane tyre
03-24-2024 05:48 PM
Modern rims crack at spoke holes
03-24-2024 05:32 PM

[-]
Join BikeRide on Strava
Feel free to join if you are on Strava: www.strava.com/clubs/bikeridecom

[-]
Top 5 Posters This Month
no avatar 1. Painkiller
21 posts
no avatar 2. ReapThaWhirlwind
16 posts
no avatar 3. Jesper
15 posts
no avatar 4. GirishH
15 posts
no avatar 5. meamoantonio
15 posts