Bicycle TutorBicycle Tutor

Show off your bike!

Related video tutorials:
How to Adjust Your Front Derailleur How to Adjust Your Front Derailleur
* Now with 3D interactive instructions
Front derailleur adjustment- not enough cable pull?
#1
I probably have 10+ hours into trying to adjust my front derailleur. It's a a 1999 Trek 8500 (Deore LX front top-pull derailleur). I've watched the bicycletutor video, followed the Park Tool guide and the Shimano installation/adjustment directions repeatedly with no luck.

After positioning the derailleur and adjusting the lower limit screw for proper positioning in low gear, I can not get the front derailleur in high gear with out significant rubbing on the outside plate, even after fully loosening the upper limit screw. If I use my hand to put additional tension on the cable, I can get the derailleur to where it needs to be and there's no rubbing.

I've tried using the barrel adjuster to adjust cable tension. If I adjust it to the point that its not rubbing on the outer plate in high gear, then there is a huge amount of rubbing on the inner plate in low gear (even with the lower limit screw completely loosened).

In short, it seems that I'm not able to get enough travel between low and high gears using the shifters. It does not appear possible to adjust the shifter to change the amount of cable pull between gears.

Is this an issue with the shifter, the derailleur, the cable, or am I just failing at properly adjusting?
Reply
#2
Be sure to put the crank at a 3 o'clock position, then pulling manually the derailleur, see if there's a 2 mm gap between cage and chainring...

Also be sure that your derailleur is parallel to your chainrings, if it's a bit misaligned, you'll have some rubbing for sure...,
Reply
#3
(05-26-2012, 05:10 PM)bobtravers Wrote:  Be sure to put the crank at a 3 o'clock position, then pulling manually the derailleur, see if there's a 2 mm gap between cage and chainring...

Also be sure that your derailleur is parallel to your chainrings, if it's a bit misaligned, you'll have some rubbing for sure...,

Bob - thanks for the response...

I figured out what was going on.... in short I was an idiot.

I just got my bike work stand about a week ago... Instead of clamping to the seat post like everybody else in the free world does, I elected to clamp to the top tube. That was pinching down on the shift cable for the front derailleur and was preventing the shifter from pulling as much as it normally does.

I can't believe how much time I sank into that....! doh.
Reply
#4
yeah, you only do it once.
Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  Problem with my Front Derailleur on my Bike CUDAcores89 1 2,746 10-17-2017, 08:12 PM
Last Post: kazz
  Front Derailleur/Shifter Problem kazz 0 2,463 10-06-2017, 02:28 AM
Last Post: kazz
  Front derailleur shifting problem dventura 1 6,909 02-28-2017, 06:07 PM
Last Post: nfmisso
  Front derailleur won't shift into third (largest) gear bruin1989 1 8,447 08-01-2016, 07:14 AM
Last Post: Joe_W
  Front derailleur can't shift from inner chainring to outer...sometimes Ptero 2 5,149 07-19-2016, 02:15 PM
Last Post: Joe_W
  Front derailleur drags on middle chainring? fionn88 1 4,992 06-09-2016, 08:56 PM
Last Post: DaveM
  Remove chain from front derailleur rider2 1 4,376 05-13-2016, 04:16 PM
Last Post: DaveM
  Chain Coming off Randomly / Front Derailleur Jlpicard440 12 7,491 09-07-2015, 06:29 PM
Last Post: painkiller
  Blocked front derailleur? dude 2 3,805 08-27-2015, 06:38 AM
Last Post: dude
  A Front Derailleur mounting and matching problem. qipow 0 3,776 08-08-2015, 11:53 AM
Last Post: qipow

Forum Jump:



ISSN 1918-3445 © Copyright 2007-2010 Bicycle Tutor / Privacy Policy / Created by Alex Ramon

feed