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

Front Derailleur moves chain too far over

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 Derailleur moves chain too far over

Old 06-16-19, 08:38 PM
  #1  
Bashbike
Newbie
Thread Starter
 
Join Date: Jun 2019
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Front Derailleur moves chain too far over

Hi all,

I have a road bike with a Claris 2400 triple front derailleur and shifter. I biked perhaps 700 miles on it.


In the largest ring, I have two half-shifting positions (of course). What's puzzling: once I'm in the outer half-shifter position, I can move the shift lever further resulting in the derailleur significantly moving further outwards by 2 to 3 mm. Once, I release the shift lever, the derailleur goes back to the outer half-shifter position.

This causes a lot of misery:

I have to very carefully shift from the middle to the large ring. Once I hear the half-shifter click, I need to stop pushing the shifter further otherwise the derailleur goes into this 2 to 3 mm offset position making the chain slip over the large ring.

This is mostly a problem when I'm on the rear in the outer cogs. When I'm in the inner cogs, the chain does not slip over.

How do I get rid of these 2 to 3 mm?

By now I made a lot of random changes including changing the position of the derailleur. So, assume a completely messed up system :-/.
Bashbike is offline  
Old 06-17-19, 08:44 AM
  #2  
Jon T
Senior Member
 
Join Date: Jun 2017
Location: West Orange County, CA
Posts: 1,112

Bikes: '84 Peugeot PH10LE

Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 397 Post(s)
Likes: 0
Liked 55 Times in 39 Posts
Don't you have travel limit screws on the derailleur? If so, easy fix.
Jon
Jon T is offline  
Old 06-17-19, 08:56 AM
  #3  
Bill Kapaun
Really Old Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 13,824

Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 1774 Post(s)
Liked 1,231 Times in 852 Posts
Try screwing in the H screw about 1/8-1/4 turn at a time and see if you can find a happy balance of not over/under shifting.
Bill Kapaun is offline  
Old 06-17-19, 01:48 PM
  #4  
dsaul
Senior Member
 
Join Date: Jan 2013
Location: South Jersey
Posts: 2,258
Mentioned: 18 Post(s)
Tagged: 0 Thread(s)
Quoted: 712 Post(s)
Liked 793 Times in 471 Posts
Start here - https://www.parktool.com/blog/repair...eur-adjustment
dsaul is offline  
Old 06-17-19, 02:00 PM
  #5  
dedhed
SE Wis
 
dedhed's Avatar
 
Join Date: Apr 2005
Location: Milwaukee, WI
Posts: 10,516

Bikes: '68 Raleigh Sprite, '02 Raleigh C500, '84 Raleigh Gran Prix, '91 Trek 400, 2013 Novara Randonee, 1990 Trek 970

Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quoted: 2731 Post(s)
Liked 3,361 Times in 2,034 Posts
YOu need to set your high limit screw. The FD overshifts to allow the inner cage to push the chain and then drops back when released to prevent chain rub. That's normal operation. The overshift is going too far and pushing the chain onto and then off the big ring. The H limit screw being properly adjusted should prevent this. If the bike is new and under warranty I'd let the LBS adjust it.
dedhed is offline  
Old 06-18-19, 09:22 AM
  #6  
Phil_gretz
Zip tie Karen
 
Phil_gretz's Avatar
 
Join Date: Aug 2009
Location: Fair Oaks Ranch, TX
Posts: 7,006

Bikes: '13 Motobecane Fantom29 HT, '16 Motobecane Turino Pro Disc, '18 Velobuild VB-R-022, '21 Tsunami SNM-100

Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 1465 Post(s)
Liked 1,542 Times in 806 Posts
The bike shop who sold you the bike should have caught this at set-up. FD high limit screw. Go back to them and have them do it correctly.
Phil_gretz is offline  
Old 06-18-19, 09:32 AM
  #7  
Bashbike
Newbie
Thread Starter
 
Join Date: Jun 2019
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
The bike-store is a virtual bike-store

I played around with the h-limit screw. This has not helped. I played around with "height" of the derailleur on the tube. That has not helped. A combination of both helped.

On the bike-stand (actually I don't have a bike stand - for work/repairs I put the bike upside down) the chain does now nicely move from one ring to the next.

On my test-ride the chain barely moved from the smaller to the larger ring when being in the smaller cogs on the rear: it takes some revolutions for the chain to sit firmly on the larger ring.

This discrepancy of testing things out on the bike-stand vs real world riding makes it difficult to tune the derailleur. Is there a trick to make sure that shifting in the real world behaves exactly as on my make-shift bike-stand?
Bashbike is offline  
Old 06-18-19, 09:51 AM
  #8  
Bill Kapaun
Really Old Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 13,824

Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 1774 Post(s)
Liked 1,231 Times in 852 Posts
Originally Posted by Bashbike
The bike-store is a virtual bike-store

I played around with the h-limit screw. This has not helped. I played around with "height" of the derailleur on the tube. That has not helped. A combination of both helped.

On the bike-stand (actually I don't have a bike stand - for work/repairs I put the bike upside down) the chain does now nicely move from one ring to the next.

On my test-ride the chain barely moved from the smaller to the larger ring when being in the smaller cogs on the rear: it takes some revolutions for the chain to sit firmly on the larger ring.

This discrepancy of testing things out on the bike-stand vs real world riding makes it difficult to tune the derailleur. Is there a trick to make sure that shifting in the real world behaves exactly as on my make-shift bike-stand?
You seriously expect the bike to perform properly upside down?
Bill Kapaun is offline  
Old 06-18-19, 05:45 PM
  #9  
dedhed
SE Wis
 
dedhed's Avatar
 
Join Date: Apr 2005
Location: Milwaukee, WI
Posts: 10,516

Bikes: '68 Raleigh Sprite, '02 Raleigh C500, '84 Raleigh Gran Prix, '91 Trek 400, 2013 Novara Randonee, 1990 Trek 970

Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quoted: 2731 Post(s)
Liked 3,361 Times in 2,034 Posts
Originally Posted by Bashbike
This discrepancy of testing things out on the bike-stand vs real world riding makes it difficult to tune the derailleur. Is there a trick to make sure that shifting in the real world behaves exactly as on my make-shift bike-stand?
What I normally do is adjust in the stand (a real one) and then test ride taking the tools needed along to make any adjustments on the road as needed.
dedhed is offline  
Old 06-18-19, 06:03 PM
  #10  
Troul 
Senior Member
 
Troul's Avatar
 
Join Date: Oct 2013
Location: Mich
Posts: 7,291

Bikes: RSO E-tire dropper fixie brifter

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Liked 2,910 Times in 1,884 Posts
Cable tension too taught?
__________________
-Oh Hey!
Troul is offline  
Old 06-18-19, 06:06 PM
  #11  
Bill Kapaun
Really Old Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 13,824

Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 1774 Post(s)
Liked 1,231 Times in 852 Posts
[QUOTE=Bashbike;20984477]The bike-store is a virtual bike-store

I played around with the h-limit screw. This has not helped. I played around with "height" of the derailleur on the tube. That has not helped. A combination of both helped........

You didn't screw in the H screw enough. Screw it in all the way and it won't reach the big ring, let alone shift over it.
Bill Kapaun is offline  
Old 06-18-19, 08:48 PM
  #12  
Homebrew01
Super Moderator
 
Homebrew01's Avatar
 
Join Date: Jul 2004
Location: Ffld Cnty Connecticut
Posts: 21,845

Bikes: Old Steelies I made, Old Cannondales

Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quoted: 1173 Post(s)
Liked 924 Times in 610 Posts
Originally Posted by Troul
Cable tension too taught?
Unrelated
__________________
Bikes: Old steel race bikes, old Cannondale race bikes, less old Cannondale race bike, crappy old mtn bike.

FYI: https://www.bikeforums.net/forum-sugg...ad-please.html
Homebrew01 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
grn.eyed.bandit
Bicycle Mechanics
8
07-11-17 10:19 AM
Wallonthefloor
Bicycle Mechanics
16
04-12-14 11:03 AM
spivonious
Bicycle Mechanics
1
10-03-12 03:25 PM
MTBerJim
Bicycle Mechanics
5
04-21-11 06:15 PM

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 -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.