Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

front derailler

Notices
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.

front derailler

Old 03-16-13, 01:43 AM
  #1  
redtzar
Junior Member
Thread Starter
 
Join Date: Mar 2013
Location: Hawaii
Posts: 5

Bikes: K2 Proflex, Specialized Rockhopper 29, Scott speedster

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
front derailler

Have a 1998 k2 proflex. Deore components. Front deraiiller when shifting, pinches chain against the big ring. What could cause that?
redtzar is offline  
Old 03-16-13, 03:44 AM
  #2  
jimc101
Senior Member
 
Join Date: Oct 2007
Location: West Yorkshire, United Kingdom
Posts: 5,737
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 431 Post(s)
Liked 81 Times in 70 Posts
Find the part number of the front derailleur, and set up according to the manufactures instructons https://techdocs.shimano.com/techdocs...&bmUID=jR4n2HE should resolve you issue, given the limited info supplied.
jimc101 is offline  
Old 03-16-13, 04:27 AM
  #3  
redtzar
Junior Member
Thread Starter
 
Join Date: Mar 2013
Location: Hawaii
Posts: 5

Bikes: K2 Proflex, Specialized Rockhopper 29, Scott speedster

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Right onthanx. What I meant is when I shift from the middle ring to big ring, the chain sticks in between the big ring an derailler cage. Whe I downshift from big ring to small it switches perfectly. Index shifters triple chainring on front. The derailer is bottom pull. Thanks!
redtzar is offline  
Old 03-16-13, 05:42 AM
  #4  
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Posts: 30,225

Bikes: Catrike 559 I own some others but they don't get ridden very much.

Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1570 Post(s)
Liked 638 Times in 359 Posts
Originally Posted by redtzar View Post
Have a 1998 k2 proflex. Deore components. Front deraiiller when shifting, pinches chain against the big ring. What could cause that?
It might be a little too low. You should be able to get a penny between the derailleur cage and the longest chainring tooth (if they're not all the same).
Retro Grouch is offline  
Old 03-16-13, 06:57 AM
  #5  
cny-bikeman
Mechanic/Tourist
 
Join Date: Apr 2007
Location: Syracuse, NY
Posts: 7,510

Bikes: 2008 Novara Randonee - love it. Previous bikes:Motobecane Mirage, 1972 Moto Grand Jubilee (my fave), Jackson Rake 16, 1983 C'dale ST500.

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 482 Post(s)
Likes: 0
Liked 10 Times in 10 Posts
Any one symptom can have a number of causes. As noted above the first step is to make sure the derailleur is properly set up. Just Google adjust front derailleur and choose the Park Tool or Sheldon Brown links, as well as a multitude of other sources. Once you have followed the entire procedure, including positioning on the seat tube come back here with any remaining problems.
cny-bikeman is offline  
Old 03-16-13, 07:51 AM
  #6  
dsbrantjr
Senior Member
 
dsbrantjr's Avatar
 
Join Date: Sep 2010
Location: Roswell, GA
Posts: 8,302

Bikes: '93 Trek 750, '92 Schwinn Crisscross, '93 Mongoose Alta

Mentioned: 30 Post(s)
Tagged: 0 Thread(s)
Quoted: 1429 Post(s)
Liked 1,062 Times in 710 Posts
Follow this procedure from the beginning, without skipping any steps. Make certain that each step is completed correctly or find out why, since the following steps depend upon the earlier ones being right. If you cannot get a step right, stop and ask here and we will try to help. https://www.parktool.com/blog/repair-...ur-adjustments

There is a link to rear derailleur adjustments there as well, in case you are feeling ambitious.
dsbrantjr is offline  
Old 03-16-13, 08:23 AM
  #7  
cny-bikeman
Mechanic/Tourist
 
Join Date: Apr 2007
Location: Syracuse, NY
Posts: 7,510

Bikes: 2008 Novara Randonee - love it. Previous bikes:Motobecane Mirage, 1972 Moto Grand Jubilee (my fave), Jackson Rake 16, 1983 C'dale ST500.

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 482 Post(s)
Likes: 0
Liked 10 Times in 10 Posts
Just realized how old your bike is. A lot of wear can occur to a front derailleur in 15 years. Even if it's not the original the derailleur may have quite a few years on it. Check the left inside surface of the derailleur cage for ridges that may have been cut into it by the chain from repeated shifts. They can keep the chain from shifting up properly. If you see that kind of damage, or if the derailleur pivots exhibit a lot of play replace the derailleur. Also, although that type of wear may result over a long time in any case, it's much more likely if shifts are made under power, rather than with lighter pedal pressure.

Last edited by cny-bikeman; 03-16-13 at 08:29 AM.
cny-bikeman is offline  
Old 03-16-13, 12:17 PM
  #8  
redtzar
Junior Member
Thread Starter
 
Join Date: Mar 2013
Location: Hawaii
Posts: 5

Bikes: K2 Proflex, Specialized Rockhopper 29, Scott speedster

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
It Must be old then. I worked on it for 3 hrs. Same result. No matter how high or low. I put it. Proflex is a complete pain in the ass for front derailler adjustment. No matter what it has to come completely off for ANY adjustment at all. Thanks for bell ill figure something out
redtzar is offline  
Old 03-16-13, 01:16 PM
  #9  
cny-bikeman
Mechanic/Tourist
 
Join Date: Apr 2007
Location: Syracuse, NY
Posts: 7,510

Bikes: 2008 Novara Randonee - love it. Previous bikes:Motobecane Mirage, 1972 Moto Grand Jubilee (my fave), Jackson Rake 16, 1983 C'dale ST500.

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 482 Post(s)
Likes: 0
Liked 10 Times in 10 Posts
Did you inspect the cage and look for play in the pivots before you worked on it for 3 hrs?
cny-bikeman is offline  
Old 03-16-13, 01:50 PM
  #10  
ThermionicScott 
working on my sandal tan
 
ThermionicScott's Avatar
 
Join Date: Aug 2011
Location: CID
Posts: 22,161

Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers), All-City Space Horse (hers)

Mentioned: 95 Post(s)
Tagged: 0 Thread(s)
Quoted: 3682 Post(s)
Liked 2,157 Times in 1,362 Posts
One thing that comes to mind is something applicable to most front derailleurs -- if the cranks and chain are moving at a slow speed when shifting, it's a lot easier to get this sort of a jam. The best way I know to prevent it (once the FD is set up correctly) is to get the pedals moving quickly when you want to shift, and shift to the smaller ring when you see the hill coming, not when you're about to "stall."
__________________
Originally Posted by chandltp View Post
There's no such thing as too far.. just lack of time
Originally Posted by noglider
People in this forum are not typical.
RUSA #7498
ThermionicScott is offline  
Old 03-16-13, 04:06 PM
  #11  
redtzar
Junior Member
Thread Starter
 
Join Date: Mar 2013
Location: Hawaii
Posts: 5

Bikes: K2 Proflex, Specialized Rockhopper 29, Scott speedster

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Hah!! I got it! Moved the cage up it like 5-6mm away from big ring now works flawlessly. Go figure. Took on trail, perfect. Thanks for Advice
redtzar is offline  
Old 03-16-13, 04:24 PM
  #12  
cny-bikeman
Mechanic/Tourist
 
Join Date: Apr 2007
Location: Syracuse, NY
Posts: 7,510

Bikes: 2008 Novara Randonee - love it. Previous bikes:Motobecane Mirage, 1972 Moto Grand Jubilee (my fave), Jackson Rake 16, 1983 C'dale ST500.

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 482 Post(s)
Likes: 0
Liked 10 Times in 10 Posts
If you have to adjust something wrong to get it to work, then likely something's still wrong. But it's your ride, so enjoy!
cny-bikeman is offline  
Old 03-16-13, 04:32 PM
  #13  
redtzar
Junior Member
Thread Starter
 
Join Date: Mar 2013
Location: Hawaii
Posts: 5

Bikes: K2 Proflex, Specialized Rockhopper 29, Scott speedster

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Yep im gonna replace it later just needed wheels. Highly suspicious that Itbent. Might as well so ole
redtzar is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
NickDandy
Bicycle Mechanics
6
06-22-18 10:58 PM
jonwvara
Classic & Vintage
33
01-22-18 08:36 AM
bfyak
Bicycle Mechanics
6
04-04-16 12:55 PM
JT101
Bicycle Mechanics
9
10-06-14 04:48 AM
jim p
Bicycle Mechanics
24
07-12-12 11:32 AM

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell or Share My Personal Information -

Copyright © 2023 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.