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

Front derailleur shifting problems

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 shifting problems

Old 10-03-12, 01:23 PM
Senior Member
Thread Starter
Join Date: Aug 2012
Location: Lancaster, PA, USA
Posts: 1,851

Bikes: 2012 Trek Allant, 2016 Bianchi Volpe Disc

Likes: 0
Liked 0 Times in 0 Posts
Front derailleur shifting problems

Hi All,

I did a search through the threads here and didn't find any that sounded like my situation.

I've been commuting on a Trek 7300 for a few weeks. Lately (last week or two), it has become increasingly difficult for the chain to "catch" when moving up to the big ring on the front. As far as I can tell, the derailleur is adjusted properly, in that it moves the proper distance away from the frame and the chain makes a lot of noise rubbing against it and the chain ring, but it doesn't seem to grab.

Sometimes, I can make it grab by pedaling backwards a bit and then forwards. Other times I can get it to go by changing gears in the rear while trying to get it to shift in the front. Still other times, it shifts perfectly fine.

Any ideas? Do I need to raise up the derailleur? I've tried adjusting the limit screws, but of course it always shifts right on the bench.
spivonious is offline  
Old 10-03-12, 03:25 PM
Join Date: Apr 2007
Location: Syracuse, NY
Posts: 7,522

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

Liked 11 Times in 11 Posts
Looking for a particular situation to match yours is less fruitful than looking at the proper mounting and adjustment for a front derailleur and first making sure your derailleur meets those criteria. The front needs to be at the proper height and angle to the chainwheel, with proper inner/outer adjustment and reasonably low cable friction. If you did read any of the front derailleur threads you may have seen similar to the following:

Go to https://www.parktool.com/blog/repair-...ur-adjustments and follow the directions from start to finish, skipping no steps.

Do that!

IF you do so and STILL have the problem try to determine if your derailleur cage has been bent, also check to make sure the inside of the cage has not been scored by the chain. A derailleur or chain that has developed side flex from wear can also degrade front shifting. But everything works worse if the derailleur setup is not proper, so do that no matter what.

Last edited by cny-bikeman; 10-03-12 at 03:34 PM.
cny-bikeman is offline  
Related Topics
Thread Starter
Last Post
jumpin jack
Road Cycling
09-20-14 08:49 AM
Bicycle Mechanics
08-08-14 06:42 PM
Road Cycling
09-30-10 03:51 AM
seau grateau
Bicycle Mechanics
09-11-10 11:54 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Your Privacy Choices -

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